Category Archives: Specialty Metal Fasteners

Sulfuric Acid ( H2SO4 ) is one of the most widely used and important acids, being an essential component to many industries. Equally as important is selecting the right material to survive this environment. This newsletter will provide options. WHICH IS BEST? That depends on BOTH concentration and temperature – … Continue reading

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High strength bolts are one of the main reasons engineers look to specialty materials. 17-4PH bolts often fulfill this demand. In this short newsletter we hope to answer many of your questions surrounding the age-hardened stainless steel we call 17-4PH How much strength can 17-4PH provide? 17-4PH bolts can provide … Continue reading

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Q: Can you explain to me what the difference is between cut and rolled threads? A: Cut threads can also be referred to as machined threads. The machining cuts away the material to create the thread form. Rolled threads means the threads are formed by pressing the parts between 2 … Continue reading

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Q: When do you use Titanium Grade 7 Bolts? A: Titanium grade 7 is similar in strength to grade 2 bolts but the material is alloyed with added palladium. This addition gives Titanium grade 7 bolts improved corrosion resistance in mineral acids and strong brines. This is ideal in salt … Continue reading

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Q: Can titanium handle hot saltwater conditions? A: Both grade 2 and grade 5 titanium bolts can be used in temperatures as high as 500°F (260°C). Remember as heat increases this can affect the strength of the material: https://www.specialfastenersbolt.com/titanium-fasteners-flanges.html#Mechanical

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Q: How does Monel K500 Compared to Titanium Grade 5? A: Both Monel bolts and titanium bolts offer excellent resistance to saltwater conditions. Titanium has just a slight edge on corrosion resistance to stagnant seawater compared to Monel – but this is minuscule. The main differences are strength and applications. … Continue reading

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Q: Can Hastelloy bolts provide high strength? A: Hastelloy C276 bolts can provide about 107ksi of strength. They are typically used for high temperature corrosion resistance. For corrosive applications where higher strength is needed, you may also want to consider Inconel 625. Inconel 625 bolts offer 144ksi of strength and … Continue reading

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Q: What fastener material is best for boiling sulfuric acid? A: Generally speaking, for 20-40% concentrations, Alloy 20 bolts will be the best bet for an economic solution. For all other concentrations in boiling H2SO4 you would have to use tantalum bolts, which can be costly. Though Hastelloy bolts work … Continue reading

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Q: I am looking to get some socket head cap screw made – what is the difference between forging, broaching, or EDM’ing the sockets? A. Broaching is a machining process that uses a toothed tool (broach) to remove material. Linear and Rotary are the main types of broaching. EDM (Electrical … Continue reading

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Q: Hi, I need a torque range for a A286 (aged, 160 ksi UTS) 1″-8 hex bolt. The calculator gives a torque value of 826 ft*lbs but is there a range that is acceptable? A: One thing you have to remember about torque, is it is an approximation. You could … Continue reading

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Q: We have a drawing for a 17-4 1″ bolt that we would like to order which can be heat treated to H900 – H1050. Are there any heat treat conditions that we should avoid? I’ve heard H900 can lead to sudden failure? Is this true? A: With the 17-4PH … Continue reading

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Q: I don’t see 316 on your sight but would you know if 316H material can be useed at 1500F? A: I believe 316H will survive 1500F without significant oxidation. However, please be aware, at that temperature, the material will lose a significant % of its strength. The material already … Continue reading

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Q: I’m designing a process that must be able to handle a high load at about 1000F. I’m planning to use A286, but I now need to know what bolt length size to use to make this machinery stable. I’d like to use as short small of a bolt as possible so how … Continue reading

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Q: Looking for a fastener to bolt together two HAST-X sheets that will be used as part of a furnace fixture assembly. Furnace will be used at temperatures up to 1000°C with cycling from 20°C to 1000°C and back to 20°C over a period of 2 days. This will be … Continue reading

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Q: My customer is asking me for a hex head that is QQ-N-286 per MIL Spec. Do you know what he is asking for? I’m confused. A: Yes we can help. First let’s look at the QQ-N-286. This refers to material Monel K500. Monel is a nickel alloy used for … Continue reading

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Q: My customer is asking for a 1/2″ bolt for a high temperature application to 1300F that is to the spec ASTM F2281. What material is this and what is ASTM F2281? A: The specification ASTM F2281 covers several materials including Inconel, Alloy 330 and A286. The spec does not … Continue reading

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Q: Your strength chart for A286 says it offers 120-160 ksi tensile strength. What does this mean? And how can I insure I get bolts that are 160ksi? Is this the spec ASTM A453 Grade 660? A: We can insure you get your bolts made to this tensile strength but … Continue reading

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316 stainless is a familiar alloy to many of us and perhaps one of the most widely used fastening materials. Though it serves a critical function for industry, 316 can often fall short in servicing challenging high strength, temperature and corrosion resistant applications. Here is how it measures up in … Continue reading

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I am bolting 321 stainless steel ducts (we are discussing changing to grade 91 alloy but this is only a possibility), and want to use locknuts to minimize potential for debris. The application is at 900-1050F at the bolts, so I am not sure what locknuts are available at this … Continue reading

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Q: What is the difference between a general purpose, SAE, USS and oversized washer? Are they all flat washers or different styles. And is one better than the other? A: General purchase, SAE, USS and oversize are all flat washers and all serve the same purpose of distributing the load … Continue reading

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Q: Hoping you can help me out. This seems like a technical screw that you may have knowledge on. My customer asked me for a 1/2″-13 x 2″ Long screw FF-S-86 TY IV, QQ-N-281. I’m clear on the size but what does the rest mean? I don’t even know the … Continue reading

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Q: I have a deep sea marine application that requires saltwater resistance and tensile strength around 125ksi. In addition to the saltwater and strength parameters, I’m also dealing with waters that can be stagnant. Not sure if that makes a difference. Would Monel K500 be a good choice. A: Monel … Continue reading

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Q: I’m running a process that requires a titanium hose clamp. I need a clamp that won’t damage the hose and provides a reliable seal as we are dealing with toxic chemicals in a very technical application. Is one type of hose clamp better than the other? A: A worm … Continue reading

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Q: I have a high temperature application that requires bolts that can withstand around 1900F. There is almost no corrosive contamination – strictly heat and oxidation resistance are required. I see both Inconel 600 and 310 stainless can be used at this temperature – what is the difference and which … Continue reading

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Q: I’m confused about the difference between a hex head bolt and hex cap screw? Is there a difference? A: Yes these are two different types of fasteners. A hex head bolt is just that: a bolt with a head head. It is typically used when mechanical properties are more … Continue reading

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Q: What is the difference between an allen, hex and socket driver? A: All these drivers are the same. They can be offered in a socket head cap screw (hence the term socket), pan head and flat head. An allen/hex/socket drive offers a more secure connection than say a flat … Continue reading

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Q: I’m looking for a clamp for a drinking water tank vent screen. We work with many tanks but this tank apparently has a higher chlorine residual so the 304SS worm drive clamps don’t last long. The clamp that we fabricated was a little too stiff so there were gaps … Continue reading

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Q: I have a high temperature application that runs at about 1900- 2000F. Would a ceramic bolt be a good idea. I need to have some strength and Alumina says it offers 75 ksi UTS? Will that work? A: Ceramics are not often a good idea when their are any … Continue reading

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Q: I have a question on 17-4PH H1150, do you know what the tolerance on the material strength is? Ie +/- 10% ? A: For a 17-4 H1150 bolt, we would use the ASTM A564, Type 630 spec to define the strength as 115 KSI Min Tensile, 105 KSI Min … Continue reading

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Inconel bolts are a nickel alloy fastener that are known for their use in high temperature applications that also require high strength. Many grades are also used for their excellent level of corrosion resistance in harsh chemical environments. This brief newsletter highlights the unique attributes of each Inconel bolt … Continue reading

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Q: What’s the difference between Hastelloy C276 and Inconel 625? A: C276 bolts have an edge in corrosion resistance on Inconel 625 bolts. Typically Hastelloy bolts are the go-to in many harsh chemical environments and offer improved resistance most notably in hydrochloric acid. Hastelloy is also renowned for their resistance … Continue reading

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Q: What is the difference between a Duplex nylon insert and all-metal lock nut? I’ll be using this in an offshore marine application for salt air resistance and strength. A: The main things to consider between an all metal and nylon insert lock nut is the temperature and the corrosive … Continue reading

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Q: My customer is requesting NAS and MS part numbers. What do they stand for and why are they important? A: NAS parts are National Aerospace Standards. NAS parts are best known for their precision and high strength. They come in all types of screws, nuts, rivets, rod end bearings, … Continue reading

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Q: Can you suggest a different material with similar strength-to-weight ratio as the 7075, that can be produced with a diameter M3-0.5? A: Since an M3 bolt is too small to be produced from Aluminum 7075, I would suggest either grade 2 titanium bolts or grade 5 titanium bolts. For … Continue reading

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Q: I need an Inconel 625 screw for a high temperature environment with trace corrosives. I’d need torx head bolt style. How many times can I tighten and loosen this type of bolt before I need to replace it? A: You should be able to get hundreds or even thousands of … Continue reading

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Q: I am looking to purchase dowel pins but are there standard tolerances? A: Yes, tolerances for standard inch size dowel pins would be per the ANSI B18. 8.2 spec. They have a diameter tolerance of -0.00 / +0.0002 and length tolerance of +/-0.010. If different tolerances are required then you would want to … Continue reading

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Q: I need some suggestions on bolting for an application that is running at 610 degree C in a thermal cycling environment (Room temperature to 610 deg C). Is A286 a good fit? A: This will depend a bit on the loads you are dealing with, but one of the … Continue reading

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Q: I have a customer who is looking for some Inconel flat head screws and specifically called out 100°. Is this the standard? A: Flat head screws, also known as countersunk screws, are able to be manufactured with 6 different angles – 60°, 82°, 90°, 100°, 110° and 120°. The most … Continue reading

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Q: I have a customer asking me for 17-4PH stainless, but says they need it heat treated to H1100. What does this mean? A: 17-4PH bolts are available in many different heat treatment options. This means that different heat treatments such as H1150, H1100, H1075, etc are applied to the … Continue reading

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Q: I am currently using 18-8 stainless steel socket head cap screws coated with MoS2 in a vacuum. I am having problems with the screws clamping force is sometimes loosening and they sometimes gall and jam, due to elevated temperature (700° to 1000° C) and heat cycling. What would be the most cost-effective screw … Continue reading

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Q: We would like to purchase Duplex parts. Can you xylan coat and Zinc nickel Electroplate them since they will be used in sea water? A: It is not practical to coat a Duplex 2507 bolt as it is stainless steel and will not corrode in seawater. Duplex will provide great resistance to saltwater, … Continue reading

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Q: We are currently using A286 bolts per ASTM 453 at 1200F and are having some issues with durability as the tensile strength we originally calculated necessary was 130ksi but seems like we need higher strengths. Any ideas? A: In this type of environment you should consider A-286 in the … Continue reading

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Q: My customer called out a 3a thread for their hex head screws. Is this different from a 2a thread pitch? A: Yes these are 3 different classes of fit for external inch series threads for studs, bolts, and screws 1A, 2A and 3A. 2A thread class is a medium fit, whereas … Continue reading

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Q: I have a customer who needs 316 Stainless Steel B8M bolts. Would Class 1 or Class 2 have a higher strength? A: If a higher strength is needed you would want to use Class 2. B8M Class 2 is carbide solution treated and strain hardened whereas Class 1 is … Continue reading

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Q: I was wondering if it would be okay to use the Tantalum material in a furnace with design temperature of 2600F. It is a heat treating furnace and I need a 4″ 150 ANSI RF flange. A: Generally due to its extremely high price, tantalum is produced as weld overlay … Continue reading

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Hex Cap Screws and Hex Bolts – Are they the same? While most think these parts are the same, they do have some slight differences. Hex head cap screws have a flat washer facing under the head that meet specific tolerances per ASME B18.2.1 whereas a Hex Bolt is flat … Continue reading

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Q: I have a customer requesting a UNJF thread for his Aerospace application. How are these different from a UNF thread? A: This is a great question as UNJ threaded bolts are not interchangeable with a standard UN, UNC, or UNF nut. An internal UNJ thread will assemble to a standard … Continue reading

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Q: I’m working on a project that is using Titanium bolts for our equipment and we are considering a few different sizes and grade bolts; we are considering Gr.2, Gr.5, Gr.7 and Gr.12. What would you typically specify as the maximum tensile allowable (i.e. 2/3*yield) and the maximum shear allowable … Continue reading

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Q: My customer asked for a Hastelloy stud that is threaded first to first. Is this important? A: This is a very important detail. There are 2 options for threads on studs. 1) First to First and 2) Overall Length (or physical end to other physical end). “First to … Continue reading

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Q: Would you be able to quote fasteners, that will used to bolt together multi-piece heat treat racks cast from HX. The racks are used in both solution (water quench and polymer quench) and age furnaces. Our typical temperature range during heat treat cycles is 1300-1800°F but can be as … Continue reading

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Q: I have a request for a titanium socket head cap screw. The customer asked to have this screw made to DIN specifications but I found two DIN specs for a socket head cap screw. What is the difference between DIN 6912 and 912? A: A titanium DIN 6912 socket … Continue reading

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Q: I have a customer who requested a Hastelloy bolt per MIL-DTL-1222. Is this something you can produce? A: Yes we can produce to this spec but first you should know that MIL-S-1222 has been superseded by MIL-DTL-1222. A Hastelloy bolt per MIL-DTL-1222 will cover MIL-S-1222 but the reverse is … Continue reading

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Q: I’m using metric Grade 5 titanium bolts, washers and nuts for automotive application. Since the car will never be exposed to any salt water environments do I need to worry about galvanic corrosion? A: Galvanic corrosion is really only a problem if you have a liquid medium between the … Continue reading

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Q: For a high temperature oxidation-rich environment which would be better Inconel 600 or 601 bolts? A: For this situation it really depends on the temperature range you are dealing with because both an Inconel 600 bolt and an Inconel 601 bolt offer good oxidation resistance. Inconel 600 can service … Continue reading

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Q: I’m dealing with a brackish marine environment where fresh and salt water combine. I need a strong bolt around 120ksi of tensile strength and have been using Titanium Grade 5, but they are quite expensive. I was wondering if there is a more economic alternative that can handle this … Continue reading

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Q: I’m working with a high temperature waste to fuel application that operates at 1000F normally but could spike to 1200F. Currently I am using Grade 8 bolts but I am concerned about the oxidation resistance of them and their stability at high temperatures. Do you have any material recommendations? … Continue reading

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Q: How does titanium compare to Aluminum 7075 in terms of strength and density. I need a really strong material with a low strength to weight ratio. A: A titanium bolt will be more dense than an Aluminum 7075 bolt with a density of 4.51 g /cm3 compared to 2.81 … Continue reading

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Q: I am dealing with near 100% salt saturated brine water @ 195°F. I need material recommendations and price on threaded rod that will survive in that environment. A: Hello, with 100% saturated brine at near boiling temperatures of 195F there are a few materials that can work . Bolts … Continue reading

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Q: I work on oil rig repair and we are required to have Hastelloy bolts that meet the NACE MR0175 standard. What is this exactly, and do you offer these? A: To answer the easy question, yes we offer Hastelloy screws per NACE MR0175. Now for the my involved question. … Continue reading

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Q: I have a subsea application that is exposed to extremely rapid moving salt water. Not only is it faced with these corrosive conditions but it must also be strong – 150 ksi tensile strength – in order to withstand these rough waters and maintain the structure’s integrity. Can you … Continue reading

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Q: I’m a purchasing agent and one of our engineers is requesting a 1/2″-13 x 2″ hex head bolt that is material A286 meeting F2281? What is F2281 mean? A: Good question. F2281 is a national standards specification put in place by the ASTM. An A286 bolt that meets the … Continue reading

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Q: I have a process that is running at high temperatures that can fluctuate up to 1500F that requires not only oxidation resistance but also some chemical resistance contaminants. I had tried some C276 bolts for the stray acids but they don’t seem to be working mechanically…suggestions? A: A good … Continue reading

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Q: I have a process utilizing a high concentration caustic solution of sodium hydroxide. Would C276 bolts be a good option for corrosion resistance. A: They could be a possibility but you might want to also consider Nickel 200. Nickel 200 bolts find their niche in corrosion resistance to caustic … Continue reading

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Q: We are in the planning process for a structure that must withstand 160 to 165 ksi of tensile strength. Do you have any suggestions on bolting material? A: An ideal bolt for this application would be a 17-4PH bolt. 17-4PH is a material that is over 4 times greater … Continue reading

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Q: Perhaps you can help. I am looking for a stainless-steel substitute to replace a standard SHCS. I will be fastening a stack of hydraulic valves onto a 6061-aluminum manifold with a 3000 PSI working pressure. I am not sure what the tensile strength needs to be comparable to a … Continue reading

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Q: We are a producer of a preservative agent for livestock feed. Our process requires the use of formic acid. Any suggestions on an anti-corrosive bolt that can handle this acid? A: For formic acid I would typically suggest Hastelloy C276 or Hastelloy C22 but it always depends on concentration … Continue reading

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Q: I am working on two different exhaust systems based on 409 SS. I am looking for a 3/8-16 1” long bolt which can be fastened to threads in 409 SS. Currently, I am using Grade 8 bolts made from 300 M with Nickel Based Anti-Seize. The temperature can go … Continue reading

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Q: I am looking for a bolt that will withstand working temperatures of around 800 degrees. We are having issues using grade 9 bolts that after multiple oven cycles we are having to cut the bolts off due to them being locked up. We need a bolt that will withstand … Continue reading

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Q:We have an anodizing process that sends low voltage current through aluminum bars. We have been using 316 stainless bolts, but over time the electricity heats the bolts up red hot, then we lose clamping force. The tanks contain a solution of 15% sulfuric acid, so there is some corrosion … Continue reading

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Q: I need a material that can stay oxidation resistant at 2000F in a cyclic temperature environment. Any suggestions? A: One of the best choices is Inconel 601, UNS N06601,which is highly resistant to oxidation up to 2200°F and can handle even severe thermal cycling. These Inconel bolts will offer … Continue reading

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Q: My customer is asking me to find them a Super Duplex bolt that meets DIN 912 and ASTM A1082. What does this mean and can you help out with this request. A: Yes, we can definitely help you with this request. Super Duplex is the type of material. The … Continue reading

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Q: I’m working on a medical prototype that requires a strong bolt that is biocompatible. I know I want titanium but not sure which grade is adequate for medical use. A: Typically medical grade titanium screws are produced from grade 23 or TI 6AL-4V ELI or grade 5 6AL4V. A … Continue reading

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Q: I was thinking of ordering some Duplex Zeron 100 bolts for some mild sulfuric acid. How does that compare to Alloy 20? My alloy 20 bolts are suffering some mild corrosion. A: Zeron bolts do offer a higher level of general resistance to corrosive environments compared to grades 2205 … Continue reading

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Q: I have an high temperature exhaust application that requires about 130ksi of tensile strength and is running pretty hot at 1000F. There are also some low concentration acidic contaminants that condense on the bolts during shutdowns, that have caused corrosion in the past on standard 316 bolting. Would A286 … Continue reading

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Q: Please recommend a material for use in 80 deg C oxalic acid solution. The titanium I’m using suffers, and dissolves. My hope is that C276 may work. We do not need high mechanical strength. I’m looking to order M4 and M6 socket head cap screws. A: Probably the best … Continue reading

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Q: How does a Duplex screw compare to a stainless steel 300 series fastener? Would they be better in a saltwater environment? A: A Duplex stainless steel screw offers many advantages over 300 series stainless steel. Duplex is offered primarily in two grades Duplex 2205 and Super Duplex 2507 (with … Continue reading

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Q: I have a high temperature exhaust stream that is part of an air-to-air energy recovery system that experiences temperatures around 1300F consistently and can go up to 1500 intermittently. I need to ensure that the bolts have a tensile strength of 130ksi. Can you help me out with this? … Continue reading

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Q: Because Nickel 200 bolts have much higher nickel content than Hastelloy C276 does that mean they are more corrosion resistant than a Hastelloy bolt? A: No. Though nickel content plays a huge role in corrosion resistance, however there are other elements that contribute to the high level of corrosion … Continue reading

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Q: What is the difference between using aluminum compared to a titanium bolt for a medical fastener? A: Medical grade titanium bolts – grade 5 – have an incredible strength to weight ratio. They are 60% denser than aluminum but more than twice as strong. This makes a titanium bolt … Continue reading

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Q: I’m working with a high temperature, bi-metallic bolted flange design. The steady state temperature of the flange is 1400 degrees F. The bolt is TZM, which has a lesser CTE than the thru-hole material. I’m looking for a material with a CTE less than TZM to use as a … Continue reading

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Non-magnetic fasteners service a variety of applications mainly where magnetic “interference” needs to be avoided. Cryogenic and medical applications such as MRI’s are just a few of the key places non-magnetic fasteners are needed. This newsletter highlights a few specialty metal fasteners that can service non-magnetic needs. Inconel Bolts Non-magnetic … Continue reading

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Q:How does Nitronic 60 compare to an A286 bolt for high temperature strength? A: That depends on the strength required and the temperature of your application. A Nitronic 60 bolt is known for its high temperature properties up to 1800F. At these extreme temperatures it can offer good resistance to … Continue reading

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Q: I’m looking for a bolt that can handle salt air and be structurally sound with a tensile strength of about 115-120 ksi max – do I require a titanium grade 5 bolt because I know they are costly? A: Probably not at that tensile strength. A Super Duplex bolt … Continue reading

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Q: I have a chlor alkali application that requires high strength of about 110ksi of tensile strength. Heat is not a factor but I’m concerned about the strength. Can you make any recommendations? A: For chlor alkali services one of the best materials is titanium. While a standard titanium grade … Continue reading

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Q: How does a Duplex bolt compare to AL6XN in a hot saltwater situation? A: Duplex bolts are ideal for chlorides and mild saltwater application such as brackish water, salt air and moderate temperature unpolluted seawater. An AL6XN bolt will provide more corrosion protection than a Duplex bolt in marine … Continue reading

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Q: What is the best alloy to bolt to use in a flange on the outside Hydrofluosilicic acid storage tank? A: Probably the best materials for Hydrofluosilicic acid bolting would be a Monel K500 bolt. This material will give you the strength and good corrosion resistance to the this very … Continue reading

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Q: Hi there! I have a set screw in a downhole Oil and Gas application that is experiencing cam out/stripping and seeking a recommendation for a drop in replacement. With 17-4 and stainless steel, galling is a real issue for us. Also with the application being down-hole, if the screw … Continue reading

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Q: Does Inconel 600 provide the same level of corrosion resistance as an Inconel 625 bolt? A: Not typically. For corrosion resistance, an Inconel 625 bolt is one of the more corrosion resistant versions of the Inconel alloys and it can withstand many strong hot acids. While not as corrosion … Continue reading

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Fasteners threads are made by one of two processes. Rolling the threads of the bolt or cutting them. This newsletter will describe each process, as well as the advantages and disadvantages. Rolled Threads This type of thread is made by a forming process where threads are created as the fastener … Continue reading

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Q: I’m running a laboratory process that will be exposing bolts to a variety of acids. I’d like a metal bolt that can withstand low concentration hot acids. I was thinking a Hastelloy C276 bolt may be a good option. Are there any acids I should beware of that can … Continue reading

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Q: It says that Alloy 330 is carburization resistant. What does that mean exactly? A: Carburization is when heat hardens a metal. Carburizing is sometimes used in alloy aging processes when your goal is to harden the alloy. On the other hand unwanted carburization can occur at extreme temperatures which … Continue reading

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Q: I was reading that high temperatures will accelerate the rusting of metal bolts. Is there a material that can prevent this. I’m using the screws at 1300F intermittently. A: What you are looking for is an oxidation resistant bolt. When a metal oxidizes it is attacked by oxygen which … Continue reading

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Q:We are currently using mild steel with a black oxide coating and the bolts are breaking down because they are stretching under tension because of the heat, and corrode in various places from our acids.The acids we use here are Hydrochloric (HCl) and Sulfuric (H2SO4), both are heavily diluted with … Continue reading

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Q: I’ve been using Monel 400 bolts for a coastal operation that is built in polluted, stagnant saltwater. I’m been having some slight corrosion – nothing drastic, but wanted to check if there was another material that would last longer. A: For this situation I would suggest titanium bolts. Titanium … Continue reading

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Q: What’s the difference between Hastelloy C276 and Hastelloy C22? A: Hastelloy C276 fasteners offer very good resistance to strong reducing corrosive acids, as well excellent stress corrosion cracking resistance and resistance to localized attack. They are renowned for their corrosion resistance to various concentrated, hot acids and reducing environments, … Continue reading

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Q: We need bolts for a shutdown in our Bleach Plant where Chlorine Dioxide is the attacking agent. Is titanium sufficient or should we be using C276 bolts? A: Titanium bolts are typically more than sufficient. Titanium fasteners are renowned for their resistance to chlorides and chlorines – they are … Continue reading

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Q: Can you explain to me the difference between Inconel 625 and Nitronic 60 in terms of high temperatures? Both seem to be able to handle temps up to 1800F but which is better? A: Well that depends on what you are using them for. Inconel 625 bolts are a … Continue reading

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Q: I am interested in 1/4″ x 2 1/2′ bolts and nuts that can resist oxidation up to 2000F. The application they are needed for would be to hold together a steel frame meant to hold tool steel in position preventing distortion during the heat treating process. I would like … Continue reading

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Q: I have an application that needs an alloy to withstand 2100° F with no preload. Would Hastelloy be a good choice? A: Probably not. Hastelloy fasteners have a max usable temperature of 1500°F and is primarily used for corrosion resistance. For these temperatures Inconel bolts are a better choice … Continue reading

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Q: What is the difference between alloy 330SS and 310SS bolts? A: Good question. Alloy 330 and 310 are fairly similar however there are some differences. Alloy 330 fasteners offer high temperature protection, oxidation and carburization resistant to 2100°F whereas 310SS maxes out at 2000°F. In addition, alloy 330 bolts … Continue reading

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Q:Hi, I’m interested in the JG/JP gasket for a cryogenic application. Can you recommend a material with the highest ductility as I’m concerned about the gasket becoming too brittle? A: To protect your process from loss of ductility, I would suggest using a combination of 316 SS and Graphite for … Continue reading

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Q: I have a high pressure application that exposes my flanges to sulfuric acid? Can you suggest the best flange and material for this situation? A: For high pressure applications weld neck flanges have a beveled end that, when connected to a pipe, creates a trough for a strong weld … Continue reading

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Q: Can you offer advise on a gasket that can help with leaking flange joints? A: If you have a process where you have exhausted all gasket options, try one of Revoseal’s gaskets in high temperature and pressure piping systems. Most issues with older piping systems that will no longer … Continue reading

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Q: I need a high strength salt water resistant flange for a naval application. Will be in rapidly moving seawater. A: Here I would suggest a Monel K500 flange. Monel K500 is extremely strong as it is age hardened. It offers 160 ksi of ultimate tensile strength. Also Monel flanges … Continue reading

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Q: What is the Vario gasket design? A: Vario is not a unique gasket at all, it is an adder to the existing JP/JG Revoseal gaskets to add in centering the gasket no matter what pressure class flange that the gasket is being mated to. This save metal costs as … Continue reading

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Q: How do the Revoseal gaskets compare in terms of leak rate to a spiral wound or kammprofile style? A: The Revoseal gaskets perform hundreds to thousands of times better than these types of gaskets. Kammprofile gaskets leak 765 times MORE than a Revoseal gasket and spiral wound gaskets leak … Continue reading

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Q: I need a high temperature gasket that can provide a tight seal to a hazardous application that reaches temps of about 1200F. Do you have a product that can help me? A: Yes. An Inconel JG / JP gasket can give you high temperature resistance at these temperatures. The … Continue reading

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Q: I need a gasket for dissimilar flange faces with an 8mm gap. Is there a solution you can provide to fit this issue? A: Yes. We can produce custom JG / JP gaskets that fit dissimilar flange faces for a tight seal. JG / JP gaskets could be made … Continue reading

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Q: I’m using a spiral wound gasket and am having difficulties with leakage. Can you recommend something that can protect against leakage and handle a harsh salt-rich corrosive environment? A: For this type of application I would recommend a titanium or Titanium JG / JP gasket. This style of gasket … Continue reading

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Q: I have a leaking gasket that is in a heat transfer fluid application. What do you recommend? A: For this situation you may want to try the Revolution gasket system. Due to consistent sealing pressure it will offer you a far lower leak rate than an off the shelf … Continue reading

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Q:Can I get the Eco+ gasket in Duplex Steel? I have a high pressure application A:Unfortunately Eco+ standard material of construction is 316L or 316Ti; however specialty materials like Duplex are available in the JG / JP design. This type of gasket can handle the most harsh environments – not … Continue reading

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Q: I have a high pressure steam application that is affected by a lot of hammering (pressure fluctuations). What gasket design can I use to prevent leakage? A: For this application I would recommend the Revoseal Eco+. Not only does this gasket offer 1000x better sealing than graphite gaskets, its … Continue reading

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Q: I need a high temperature gasket that would be able to handle thermal cycling. Any ideas? A: The Revolution gasket is ideal for thermal cycling. The design of the gasket accommodates flange movement that can be caused by thermal cycling and vibration. The corrugated design of the Revolution gasket … Continue reading

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Q: I have a highly corrosive sulfuric acid application that I need a gasket for a Hastelloy flange. Can you tell me which style gasket would work best? A: The JP/JG gasket would be the best for your application. Because it can be made from specialty alloys like the Hastelloy … Continue reading

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Q: I have an application that requires high temperature oxidation resistance up to about 2000F. Any suggestions? A: For these conditions there are two options I would suggest. You could try Inconel 600 bolts which are usable to 2000F. They offer excellent carburization and oxidation resistance. Since your process is … Continue reading

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Q: We are researching a bolt to be used in a medical implant? Is there a standard material you can suggest? A: While there are a variety of possibilities depending on the requirements for the screw, a go to material for many implantable fasteners for good strength and biocompatibility, is … Continue reading

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Q: We are using A4 stainless bolting on Hastelloy C22 valves for a process that involves NaCl processing media. We are experiencing corrosion. Can you suggest a bolt that would help eliminate this. Can you make any suggestions? Also could you share the mechanical properties of any suggestions as well. … Continue reading

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Q: I’m looking for a radiopaque material for an xray application. I’ve tried lead but need something that is more intense that could be made into a screw. Is there a material you can suggest? A: Tungsten screws are excellent for radiopaque x-ray applications. Tungsten offers a higher density than … Continue reading

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Q: I’ve been using 254 SMO bolts and am happy with their corrosion resistance but need a little more high temperature stability as sometimes our process can go up to 800F. Any suggestions? A: 254 SMO bolts are in a class of material called 6 Moly alloys. Another 6 Mo … Continue reading

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Q: I have some 316 bolts that are experiencing slight corrosion from a mild chloride environment. I need an economic solution but a more corrosion resistant material. Any ideas? A: You have a few options here but you should consider a class of alloys called 6 Mo or 6 Moly … Continue reading

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Q: Looking for a bolt rated 320 psi for use at a temperature of 1292F on an Incoloy 80oHT flange? Suggestions? A: Assuming you want hex head bolts and Inconel 625 is probably your best choice at those temperatures. At about 1300F, Inconel 625 bolts (per the chart below) should … Continue reading

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Q: We are having issues with a high temperature flanged joint where the bolts are continually loose when they cool down the system. The issue to me sounds like the bolts are losing tension due to the temps being too high and softening the bolts so they are plastically deforming. … Continue reading

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Q: I have a high temperature exhaust stream that needs an oxidation resistant fastener? Any suggestions, my temperature is about 1400F? A: For this temperature you have a few options depending on the strength you need. One option may be Nimonic 80A bolts which are usable to about 1500F. Also … Continue reading

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Q: I need fasteners for an exhaust duct where I want to use bolts to act as a stopper for a blast gate. The max temperature 1650F. Any suggestions? A: In this type of environment, Inconel 625 bolts would be one of the strongest and most temperature resistant materials you … Continue reading

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Q: I need a material with slightly more corrosion resistance than the Super Duplex bolts I’m using. I’m using them in heated salt water for desalination and over time experiencing slight corrosion. Anything that could withstand the salt water better? A: You have a lot of options. One may be … Continue reading

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Q: Can you tell me how the mechanical properties of C276 compare to the A4 stainless? A: That would depend on the grade of A4 you are talking about but as a rough comparison Hastelloy C276 bolts per ASTM B564 would have a MIN Tensile of 100ksi and a MIN … Continue reading

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Q: Can you tell me what the difference is between Inconel 600 and 601? I need a material for high temperature thermal cycling. A: Both Inconel 600 and Inconel 601 bolts are oxidation resistant at high temperatures. The main difference is that Inconel 600 bolts have a maximum usable temperature … Continue reading

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Q: Can you tell me the difference between Hastelloy C276 and Inconel 625? They both seem to be corrosion resistant to sulfuric acid but I also need a high strength material. A: Yes both perform well in sulfuric acid application, but in terms of corrosion resistance, Hastelloy C276 bolts would … Continue reading

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Duplex Steel: Strength & Corrosion Resistance Beyond 316 316 Stainless steel fasteners have many applications, but if you are looking for an all-around improved fastener without breaking the budget, Duplex alloys might be a good choice. Duplex steel fasteners are known for their improved strength (being about 2x stronger) and … Continue reading

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Q: Can you tell me the difference between alloy 330 and 310 stainless fasteners? I’d like a more economic alternative to the 330 but didn’t know if 310 stainless could be used instead. I have extreme cyclic conditions running to about 2000F? A: If cyclic conditions are a concern you … Continue reading

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Q: We are using a bleach solution as part of a medical device application and seeing some rust/corrosion? Any ideas on a fastener material that will not corrode in bleach? Chemicals used are: 5.25% Sodium hypochlorite (or 10% bleach), 70% Isopropyl alcohol and Ammonium chloride A: You might want to … Continue reading

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Q: Can I use zirconium bolts in boiling HCl. Concentration would be about 5%? A: Yes, zirconium fasteners work well in hydrochloric acid but may be a bit overkill at that relatively low concentration but depends on the temperature and other media it may be exposed to. Zirconium screws do … Continue reading

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Q: How does 254 SMO compare with Alloy 20 and AL6XN? Can it handle sulfuric acid? A: To answer your first question, I’ve ranked each of these specialty alloys in terms of their general corrosion resistance to sulfuric acid: 1. Alloy 20 Most 2. AL6XN Moderate 3. 254 SMO Least … Continue reading

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Q: Are Nimonic bolts a good choice for a high temperature vacuum environment? A: That depends. Typically for extreme temperatures in a vacuum we recommend Molybdenum fasteners. Moly bolts have an extremely high melting point and can be used at much higher temperatures – close to 2900F – ONLY when … Continue reading

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Q: I’m looking for a material that can service a brackish water environment with high strength around 100ksi, would SMO 254 work for me? A: In terms of the corrosion resistance, yes, but for strength you are right on the edge of the capabilities for 254 SMO fasteners. 254 SMO … Continue reading

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Q: Which material would be better suited for a nitric acid environment (Hastelloy C276 or Inconel)? The screws would not be submersed in the acid, but in a room where the screws would be around the fumes. A: For nitric acid fumes Hastelloy C276 bolts would be the go-to material … Continue reading

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Q: I’m looking for a nut in a large metric size. I know I can’t get it made in this large a size for class 10 steel so I’m hoping you can recommend a material that can be made to an M16 with similar strength. A: If you are looking … Continue reading

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Q: Currently I’m using screws made of 400 series stainless steel for use in factory machinery that is moving in a circular path creating a centrifugal force. Our existing bolts are breaking and we’re looking for a bolt with a more rigid type of material that will not break or … Continue reading

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Q: I’m in need of hex head bolts for a gas turbine hot section application. These bolts would need good strength and min. temperature tolerance of 1000 degF. Any suggestions? A: A286 bolts are an option, but would be on the lower end of these materials in terms of temperature … Continue reading

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Q: Will Nickel 200 bolts be a good choice for hydrofluoric acid? A: For aqueous HF, Nickel 200 fasteners offer limited protection. If application requires a metal then you may want to consider Monel 400. Monel 400 bolts are the most resistant option for hydrofluoric acid in all concentrations up … Continue reading

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Q: What is the difference between Nitronic 50 and 60? A: Both grades of Nitronic offer similar strength which is nearly double the yield strength of 300 series stainless steel (Nitronic 50 100ksi UTS and Nitronic 60 95ksi UTS). The real difference is in the temperature capabilities and the usage … Continue reading

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Q: What is the difference between the different grades of tungsten and why would I choice one vs the other? A:Tungsten fasteners are available in commercially pure tungsten (Tungsten CP) which is 99.95% pure. This grade offers the highest density, strength and hardness of all the grades. It is also … Continue reading

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Q: I’m looking for a material that is radiopaque. Do you have any suggestions? A: Two materials come to mind. First is tantalum. It is often used in medical applications for its radiopacity. Tantalum fasteners are also bio-compatible and extremely corrosion resistant. The second material is tungsten. Tungsten fasteners come … Continue reading

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Q: Is there a material you can recommend that can handle a high temperature exhaust stream which has trace corrosive chemicals? I’ve tried A286 bolting but am having some corrosion issues. A: When a process demands high temperature corrosion resistance, depending on the temperature and amount of contamination, you might … Continue reading

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Q: I’m in need a high strength bolt that can not only withstand temperatures of 1000F but also be exposed to chemical contaminants from time to time. The 1000F is the max, probably not the constant. Strength would need to be around 150ksi. Contaminants would be salts and some low … Continue reading

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Modern day engineering is key to helping the world through this difficult time, and specialty material bolts make it possible. Materials like titanium, PEEK and 17-4PH provide the corrosion resistance and high strength needed for manufacturing and high-tech distribution. This newsletter shows some of the ways Special Fasteners China. & Fastener … Continue reading

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Q: I have the need for a bolt that can withstand high temp brine byproduct from an oil & gas installation. Any suggestions? A: Depending on what temperatures you are dealing with Duplex Steel bolts may be a good fit. Duplex bolts provide good localized resistance to brines and chlorides. … Continue reading

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Q: I’m looking for a high density material that is also high strength. I need set screws for a weighted part, but they also need to have about 120ksi of tensile strength. Is this possible? A: Yes, for this type of application you’ll want to use pure tungsten or a … Continue reading

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Q: I need a bolt that can handle a chemical processing situation where there are not only corrosive chemicals but also high temperatures that can fluctuate. Max temp is around 1200F. What would you suggest? A: Not knowing the chemicals you are using makes it tough, but for high temperature … Continue reading

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Q: I have a process that utilizes about 10% hydrochloric acid with trace amounts of other chemicals. I tried zirconium bolts because they are known for HCl but we’re burning through them like crazy and I can’t figure out why they are corroding. Any ideas and what other material may … Continue reading

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Q: I have equipment that requires a high strength bolt. Temperature and corrosion are not an issue, solely strength. I had tried Super Duplex thinking that would do the trick, but I’m still having breakage. Any ideas? A: For an application that exclusively requires high strength, you might want to … Continue reading

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Q: I’ve been using Monel 400 for a saltwater application but I’m having issues with bolts notwithstanding the application pressure. Is there a saltwater resistant fastener that can give me higher strength? A: Yes for higher strength saltwater resistance you have two options. Monel K500 bolts are an age hardened … Continue reading

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Q: I’m running a process that has a huge swing in temperature fluctuations due to downtime and maintenance. The max temperature is around 1500F. Can you suggest a material that can handle this? A: For processes that are faced with the dual dilemma of both high temperature and cyclic conditions, … Continue reading

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Q: We need a custom bolt for securing a 304SS flange to a pressure vessel located in a submerged DI water pit. We have a few concerns/requirements. First, we need to ensure that galling and corrosion do not prevent us from removing the bolts during service events (between 1 and … Continue reading

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Q: I am looking to eventually get a quote for some 3/8″ studs and nuts. I need to have a min yield stress of 29 ksi at 700F. SA-540 Grade B22 Class 2 or SB-637 should work. Is this something you can provide? A: These are very different materials: A-540 Grade B22 Class … Continue reading

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Q: I have an application that is exposed to mainly chloride but has some other acid contamination. Can I still use titanium to protect for corrosion. A: Though titanium fasteners are highly resistant to chloride – almost immune – they typically do not work well with many other mixed acid … Continue reading

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Q: Can I use Molybdenum outside of a vacuum? A: Yes and no. It can be used outside a vacuum but it is much more limited, especially if in an oxygen rich environment. The catch is if you use Molybdenum outside a vacuum (in an oxygenated environment) the temperature MUST … Continue reading

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Q: We currently use Titanium screws, and I would like to know pricing and lead time to replace them with Tantalum screws to improve their resistance to HCL. A: What concentration and temp are you at with the HCl? See the HCl Iso-Corrosion curve for Hastelloy C276. Tantalum screws will … Continue reading

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Q: I have an application, which will be heated by radiant heat from below to 700°C to 900°C. The problem I am trying to solve is that the screws tend to fuse to the plate they are fastening. Black Oxide alloy steel is the best we’ve tried, but still very … Continue reading

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Q: We are installing bolts into a refinery wharf. After doing a test run on a few A316 stainless steel bolts, they came back heavily corroded. Do you have an coating that can be used for salt water applications that would prevent this? Or do can you advise on another … Continue reading

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Q: I have an application where I need contaminants to vent. I want to limit the amount of atmosphere that is vented – can I specify the diameter of the drill hole in a vented screw? A: Yes, depending on the diameter we can produce vented screws that are per … Continue reading

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Q: I’m looking for a unique type of screw called a snake eye screw. I noticed that you work with specialty alloys and I’m looking for this part made of hastelloy – is this possible? A: A snake eye screw is another name for a spanner security screw. Depending on … Continue reading

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Q: I have a hazardous application that involves sulfuric acid. We need to prevent anyone from tampering with this application. Can you help me out with a solution? A: Yes. First regarding the sulfuric acid, you’ll need a bolt that can resist this type of environment. Depending on the concentration … Continue reading

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Q: I heard their is a type of bolt with a hollow core that I can use to enable a faster pump-down on my vacuum system. Is this something you are familiar with or can offer? A: Yes this type of bolt is referred to as a vented screw. It … Continue reading

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Q: I have a need for a marine resistant fastener that I can use to fasten equipment to concrete. Is there a bolt you can recommend? A: For concrete fastening one of the best solutions is a wedge anchor bolt. This style of bolt features an expansion mechanism which expands … Continue reading

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Q: Can I use a wedge anchor to attach a piece of equipment to metal? I need a high strength fastener. A: No. Wedge anchors are used to strictly for fastening into concrete. The anchor is actually an expansion mechanism which fans out and locks the bolt into concrete as … Continue reading

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Q: I need a large quantity of fasteners that can offer about 100ksi of tensile strength and provide me resistance to seaspray and salt air. Is titanium a good choice? A: Titanium grade 5 bolts will meet both these requirements, but will probably be overkill in your situation. For this … Continue reading

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Q: We’re in need of bolts for an oil & gas refinery. How can I be sure you your materials meet technical requirements. A: We can provide fasteners that meet NACE MR0175 and NACE MR0103 specific requirements for different metallic materials. When requesting a quote, please ask for all necessary … Continue reading

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Q: Can I use Hastelloy C276 bolts for protection from Nitric Acid? A: Typically this is not recommended. Though C276 bolts are highly corrosion resistant to many acids, it is not very resistant to strong oxidizers like nitric acid. Materials with higher chromium content like Incoloy and possibly Hastelloy C22 … Continue reading

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Q: I’m interested in TZM or Tantalum fasteners and was also wondering if there was an option to have the fasteners coated to increase the use temperature in air? A: There really is not a coating that could be used for tantalum and molybdenum screws to increase their life in … Continue reading

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Q: We’re using sodium hydroxide as a water treatment chemical to raise the pH of water but are experiencing corrosion. Is there a material that can handle this? A: Typically for caustic soda (sodium hydroxide) corrosion, you might want to consider Nickel 200 bolts. Nickel 200 is best known for … Continue reading

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Q: Looking at options to increase the tensile strength for a socket head cap screw. We are currently using grade 8. Would Waspaloy be a good option? A: If you are looking for a fastener with higher strength than Grade 8 Alloy Steel (150 KSI Tensile, 130 KSI Yield), and … Continue reading

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Q: I have require fasteners for use in an annealing oven for aa centrifugal fan (@1725 RPM) attached to a shaft with a through bolt and nut (shaft and fan are both SST). The environment is 1275 degrees F at atmospheric pressure and runs continuously 5 days a week I … Continue reading

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Q: What stud and nut material should I use with a ANSI 600# Alloy 800 HT pipe class max temperature 1650°F. A: Given that you are at a high temperature and pressure I would recommend going with an Inconel 625 stud. This will provide the best combination of high temperature … Continue reading

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Q: Are you able to provide the assembly torque number for titanium M42 diameter bolts? A: The torque required for large bolts like this can vary GREATLY depending on the conditions, lubrication, surface roughness, dirt, etc. The required torque can vary by as much as +/-50%. However with that in … Continue reading

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Q: Can you provide the torque specification for a Hastelloy C276 4-40 socket head cap screw and a Nickel 200 4-40 socket head cap screw? A: The torque tables are developed for screw heads that have no limitations on torque. Unfortunately the socket head drives will likely cam-out before you … Continue reading

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I am looking for the best available material solution for Oil&Gas industry with occasionally presence of H2S. For now we are using A286 but I am not sure about its H2S resistance. What kind of material you can recommend that is comparable to A286 and is H2S rated? When … Continue reading

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Q: Im looking for Inconel 718 bolts but I need a bit more strength than what is typically offered as a min of 185ksi Ultimate Tensile. Is it possible to make Inconel 718 stronger than that? A: Yes…Actually Inconel 718 bolts are available in a few different flavors. The most … Continue reading

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Q: We are installing denso jackets around several steel piles at a wharf. The jackets are going to be held together by A316 stainless steel bolts. After doing a test on a few, they came back heavily corroded. Can you suggest a material that can handle the salt water? A: … Continue reading

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Q: I’m using aqueous Hydrofluoric acid in a silicon etching process but amy Nickel 200 bolts aren’t holding up. Is there a better material I can use? A: Nickel 200 fasteners are excellent for use in anhydrous hydrofluoric acid, but in the aqueous form of HF acid they offer limited … Continue reading

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Q: I work in a plant that manufactures paper. We’re treating pulp with a solution containing sodium sulfide and sodium hydroxide to dissolve the wood materials and produce cellulose to make paper. Can you suggest a material that can give our bolting some corrosion protection and better longevity. Some of … Continue reading

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Q: We are interested in a fastener material that can work at 1000°C in high vacuum? Do you have any suggestions? A: For high temperature vacuum environments, a great material to consider for your fasteners would be Molybdenum screws. Molybdenum screws have an extremely high melting point of over 2600°C … Continue reading

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Q: I am in need of six 7/8″ diameter bolts, 9″ in length, that can withstand about 230,000 psi in tensile stress for infrastructure project. Do you have any bolt that can meet this strength requirement? A: When you are talking about extremely high strength in the range of 230 … Continue reading

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Q: I’m running a chlor alkali process to produce sodium hydroxide. We would like bolts that have a strong resistance to the NaOH. Should I try hastelloy? A: In terms of caustic alkaline solutions, such as sodium hydroxide, your best bet would be Nickel 200 bolts which are known to … Continue reading

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Q: Isaw on the website that you produce Belleville spring washers. Are you also able to produce these in TZM? We are looking for Belleville spring washers which can withstand high temperatures to 500 degrees Celsius. A: Unfortunately, we can’t produce Belleville washers in TZM or other refractory metals,but we … Continue reading

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Q: I’m looking for bolts/nuts material able to withstand to cycling temperature changes from 20 Celsius up to 600 Celsius. Strength is also important . Looking for something with tensile strength at least 800 Mpa. The application is diesel engine exhaust manifold. Looking at your web site not sure Inconel … Continue reading

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Q: We are providing the Navy components made of Navy G Bronze that incorporates shoulder bolts and set screws. The assembly will be exposed to air, salt water, modest temperatures (0C to 80C), and limited stress. What alloy do you recommend? A: Sounds like a Monel 400 might be a … Continue reading

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Q: Looking for bolts that will be used for large Diesel engine exhaust compensators in a power plant. The normal operating temp of the exhaust is 700 degrees F at full load. Loads do fluctuate often and engines experience downtime. The exhaust system does experience extreme force and vibration. Any … Continue reading

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What is a refractory metal fastener? Molybdenum, tantalum, tungsten and zirconium are all refractory metals. (We are excluding titanium from this topic although it can be considered a refractory metal by certain definitions). All these refractory metal fasteners are characterized by their high-temperature melting points, but they also have other … Continue reading

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Q: An application with limited space using a #4-40 screw with an assumed tensile strength of 120,000 PSI. This screw continues to break. Do you offer a screw with a higher strength? Also, This screw is used to hold a plate to the end of an air cylinder. It probably … Continue reading

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I have a customer looking for some studs for a flange that they say could reach 1800deg F. What would you use for that? At 1800F you have a couple of options. In a steel variety you have alloy 330 studs. This will be oxidation resistant and stable at the … Continue reading

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Q: For a marine project will 316SS cold worked (grade A4-80) hold up in strength pretty close to Monel K500? And what is the price comparison? A: Thanks for contacting and good question. The major difference is the strength and corrosion resistance. You will have decent strength of a A4-80 … Continue reading

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Q: We have on application that utilizes an HCl tank and are currently using hastelloy C276 bolts but they are not sufficient. Should we try tantalum fasteners or anther material like PEEK? The bolts are for a flanged valves connections concentration is 36%, temperature 45oC. A: Though the HCl is … Continue reading

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Q: I need a material that offers about 80-90ksi yield but is also corrosion resistant to low concentrations of sulfur acid. I’m tried 17-4Ph but its not working? Any ideas. A: Yes, 17-4PH fasteners are excellent for high strength like you need, but are not really geared for corrosion resistance … Continue reading

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Titanium is an amazing material offering strength, lightness of weight, and corrosion resistance but there are also instances that titanium should not be used. This brief newsletter covers the do’s and don’ts of titanium screws. Do Use for Saltwater & Chloride Resistance One of the most noteworthy uses of titanium … Continue reading

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Q: Are there any materials I can use with the strength of 17-4PH in the H1150 heat treat, but with better corrosion resistant properties. I have low levels of sulfuric acid and chlorides that seem to be attacking the 17-4 steel. A: The best choice for both extreme strength and … Continue reading

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Q: I’m designing a furnace vent system for a continuous service high heat appliance (NFPA 211). The maximum furnace working temperature is 2100 deg F; design temperature is 2190 deg F. Will Alloy 330 or 310 SS bolts and nuts work for me? A: You are at the absolute limit … Continue reading

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Q: I’ve been using zirconium to handle a nitric acid solution but am still experiencing corrosion? I’m not sure why or if there is a better option? A: Zirconium bolts offer some of the best corrosion resistance to nitric acid as well as sulfuric acid and hydrochloric acid, even at … Continue reading

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Q: I have a high temperature application that can reach close to 1800F that requires not just corrosion resistance from low levels of acid and salt contamination, but I also need good strength. Would Alloy 310 bolts work? A: Alloy 310 bolts could be a possibility, depending on the strength … Continue reading

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Salt water is great for swimming, but provides industry a wide range of corrosion challenges from marine vessels to desalination plants, and even off-shore oil. The good news is there are several materials that perform very well in these environments. This newsletter compares them on their salt water corrosion resistance … Continue reading

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Q: I’m dealing with a moderate chloride environment but my temperature can sometimes reach 450F. I’ve tried titanium bolts but am having some corrosion issues. Is there another material I can use? A: There are several potential choices but as the temperature increases the corrosion rate and aggressive nature of … Continue reading

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Q: I’m working in a reverse osmosis facility that purifies seawater for drinking water. We are experiencing some corrosion in some of our valve attachments which I’m assuming is from the salt water. Any recommendations on a fastener that won’t corrode in these conditions? A: Your best bet would be … Continue reading

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Q: I have an application in which I require a 1/2in-13 Hex bolt that will be in an inert gaseous environment at 500C. The bolt will be fastened to a Titanium Grade 5 nut. What material bolt would work best? A: I would suggest either Inconel 625 or Inconel 718 … Continue reading

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Q: We have on application in one HCL tank and we are using hastelloy bolts but they are not efficient. So I ask the quotation for material tantalum in metals or other material like PEEK, please advise what is the better solution. A: It depends on the temperature of the … Continue reading

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Extreme high strength fasteners made from advanced alloys allow industries such as aerospace, mining, and oil & gas to push the limits of what is possible. With requirements of ultimate tensile strengths beyond 200ksi this newsletter reviews these materials, their specific traits and niches.   17-4 PH Age hardened, 17-4PH … Continue reading

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Q: I’m looking into a bolt which will be used to create vacuum seal with graphite and hold vacuum of 1 Pa. I’ve tried Inconel 718 but they seem to fail loosen at high temperatures, and my system requires 1500 F. Because I am trying to seal a vacuum system, … Continue reading

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From thermal processing and furnace applications to the extreme demands of aerospace, several high temperature alloys are available each with unique traits and capabilities. This brief newsletter will outline the primary fastener materials that are commonly used for excellent high temperature and oxidation resistance. Best High Temperature Oxidation Resistant Fasteners … Continue reading

Posted in Advanced Ceramic Fasteners, Application, Blog, High Strength, High Temperature Resistance, Material, Specialty Metal Fasteners | Tagged , , , , , , , , , , , , , , , , , , , , , | 1 Comment

Q: We are a manufacturer seeking a fastener for an air cooled engine’s head bolt replacement project. The fastener would be used to hold a aluminum cylinder head. We would like to use 17-4PH but are concerned about galling? A: As you would be using two different materials, the 17-4PH … Continue reading

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Q: We are using ceramic screws in one of vacuum furnaces, they’re breaking due to thermal stresses. There is lots of thermal cycling. Are their any less brittle materials we can use? The environment is low pressure with a max temperature of 1050C. Gases used in the system include: argon, … Continue reading

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Q: I have a hot sulfuric acid application that utilizes approximately 25-32% sulfuric acid. I really need a corrosion resistant bolt but due to the vastness of the operation, I’m wondering if there is a lower cost option than Hastelloy. A: For hot sulfuric acid in your concentration range, we … Continue reading

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Q: I’m in the testing phase of a new application that will require a high strength bolt that has a yield strength of about 220ksi. The biggest problem is that the bolts will also be exposed to burst of high temperature of about 1000F. Is there any material you can … Continue reading

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Q: I’m having issues with thread galling. We’ve switch to coarse threads and tried to slow down installation speed/over-tightening. Any other ways we can prevent this? A: There are a few other things to consider in reducing thread galling. First, when possible use dissimilar metals with different hardness. Having material … Continue reading

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Q: I need some bolting to attach some surface steam piping for a power industry project. They’re using duplex bolts now but its showing some slight corrosion. Chlorides are involved and maybe some other contaminants. Ideas? A: Surface steam condensers and other power industry elements that are exposed to salts … Continue reading

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Q: We’re making some changes in our waste water treatment process and are going to using hydrochloric acid (HCl) as a means of lowering the pH levels. Will I need to upgrade my duplex bolting? A: Assuming your waster water is at ambient temperatures the only thing you need to … Continue reading

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Q: I read that titanium regenerates a protective layer quickly in presence of water. Does that mean its okay to use it with sulfuric acid with steam present? A: Titanium fasteners are probably not the best solution for sulfuric acid but may work depending on your concentration and temperature. Titanium … Continue reading

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Q: We have some machinery operating in salt fog with sea spray as well. Salt corrosion is an issue but most importantly I need bolts with a yield strength over 100ksi. Any thoughts? A: For this environment you have two options. First, with a yield strength of 110ksi I’d suggest … Continue reading

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Q: I have a situation where I’m not only dealing with a hot steam environment which can reach 700F but there is also sulfuric acid condensation that can form during cool down periods. Are their any materials that can handle heat and corrosion? A: Typically when dealing with sulfuric acid … Continue reading

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Q: I’m having trouble with corrosion of our bolts in a sour gas well environment and we are currently using a super duplex stainless steel. Can you help me with a bolting material that would be improved? A: Hastelloy C276 bolts are ideal for sour gas environments and would be … Continue reading

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Q: I’m running a coastal power operation and am having some corrosion on my stainless steel bolts that are outside. Can salt air do that? And any suggestions on a material. I need high volume so I need to go with something economic. A: Salt air can cause corrosion. If … Continue reading

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I’m looking for a non-corroding and magnetic washer for use in a salt water environment. Specifically, we plan to weld this washer onto a 316 stainless basket so that it can be attached to a magnet. Currently we are using 302 stainless baskets, which are magnetic enough to attach to … Continue reading

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Q: I need a shoulder bolt that will not change its shape at elevated temperatures. The bolt is near a mild carbon steel welding process and is under a small load. It is not in the heat affected zone, but it does see an elevated temperature. I am not sure … Continue reading

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Q: I need a salt water corrosion resistant screw that will work well to fasten an aluminum housing for deep sea equipment. I am concerned about galvanic corrosion. What material should I consider? A: Since you are using fasteners in an ocean environment and in contact with aluminum you have … Continue reading

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Q: I work in the food industry and need a larger sized polymer fastener sized 1/4-20 x 2.5″. I tried PTFE but it isn’t does not seem to have enough strength. It also needs to be FDA approved and offer moderate corrosion resistance. A: Not knowing the specific strength requirements … Continue reading

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Q: We are altering the chemicals we use to regulate the pH level of our manufacturing process with hydrochloric acid. I’m using some Inconel 625 bolting – will this work in the HCl too? A: Inconel 625 bolts offer a high level of corrosion resistance for many acids, may work … Continue reading

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Q: I have some machinery exposed to salt water as well has drastic temperature swings. I’m concerned about corrosion but also a material that will become brittle. A: Monel 400 bolts are an excellent material for salt water corrosion protection and is a go-to material for many marine applications. As … Continue reading

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Q: I need some high temperature engine components that can provide high strength (100ksi yield) to 1000F as well as oxidation resistance? Are molybdenum bolts good for that? A: Though Molybdenum is excellent in high temperature environments its generally reserved for very high temperature vacuum application where no oxygen is … Continue reading

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Q: I’m dealing with a stagnant seawater situation. I’ve tried Monel 400 bolts because of its salt water resistance but am experiencing mild pitting corrosion. Any material that would fair better? A: Monel 400‘s only Achilles heel in terms of salt water situations usually occurs in stagnant waters where is … Continue reading

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Q: I have a process where I’m experiencing corrosion from my industrial water system. I’ve tried Hastelloy C276 bolts but they are corroding much faster than I would expect. The water only has low levels of Hydrofluoric Acid (HF). Any ideas would be great. A: Hydrofluoric acid is an unusual … Continue reading

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Q: I’m running a chlor-alkali process and have been using Duplex 2507 bolts. I choose them for their yield strength and corrosion resistance but am still having issues with the chlorine. Ideas? A: Many chlor alkali processes use Titanium fasteners for its combination of high strength and chlorine resistance. Grade … Continue reading

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Q: I’m running a high temperature ethylene process that will reach 750-850C. I need a fastener that is carburization and creep resistance. Also moderate corrosion can be an issue. Any suggestions on materials? A: This process is ideal for Incoloy 800H or 800HT bolting. These materials are designed for long-term … Continue reading

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Q: I have a need for a high temperature bolts that will be used in continuous heat at about 1000F. Any suggestions? Also, will fluctuations in temperature cause breakage? A: One of the best materials for long-term continual exposure to high temperatures are Incoloy bolts. The Incoloy 800 series will … Continue reading

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Q: I’m in need of a high strength fastener that can withstand moderate concentrations of hydrochloric acid (HCl) 25%? Can I use Hastelloy Bolts? I need a bolt that can handle a yield of about 100ksi and temperatures around 100F. A: Hastelloy bolts are definitely ideal in this concentration of … Continue reading

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Q: I work in the fusion technology field, specifically in a plasma physics laboratory. We are currently using a large number of A-286 screws. The screws have to withstand the high pre-loads required to insure the ultra high vacuum tightness of our facilities (generating stresses in the screws of up … Continue reading

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Q: Hello, I currently have an application that requires high strength set screws. One of our machines uses air cylinders with threaded shaft ends made of alloy steel set screws. The set screws are actually shearing off in our application, causing damage to the cylinders and equipment. I am looking … Continue reading

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Q: I’m using a caustic soda solution to remove sulfur in a petroleum refinery. The steel bolts are NOT cutting it. Any suggestions? I don’t have a huge budget, so I’m hoping I don’t need Hastelloy or Tantalum fasteners? A: Nope…You don’t need anything that highly priced. For this situation … Continue reading

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Q: I’m running a cotton mercerizing process that is being altered to utilize sulfuric acid. I didn’t realize how corrosive using sulfuric acid (H2So4) is on my fasteners. Any ideas on how to protect my bolts. Not super hot, just corrosive. A: Alloy 20 bolts are a good choice for … Continue reading

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Q: I’m producing nitrobenzene to be used in dye manufacturing. The nitrobenzene is prepared by the nitration of benzene with a mixture of concentrated sulfuric acid, water, and nitric acid. I’ve tried Hastelloy C276 but its not working so well. A: Hastelloy C276 works very well in sulfuric acid which … Continue reading

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Q: We’re setting up a salt brine application for a chemical project. There may be some minimal exposure to some acids. Can I uses titanium bolts? A: Titanium Gr2 and Titanium Gr5 (6Al-4V) fasteners are excellent for almost all salt related environments, but here since you may have exposure to … Continue reading

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Q: I’m hoping you can help me with a high temperature issue. I’m running an ammonia plant where gases, along with hot air are heated to temps of 1800-2000F. The secondary reformer unit is made of carbon steel with refractory lining. I need bolting that can survive these temps so … Continue reading

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Q: Hi, I need a 1.25” X 15” bolt that can operate in continuous temperatures of 1000F. Currently we are using a heat treated carbon based 4140 fabricated machined bolt. At these temps the bolts are “Stress Relaxing” and we are losing our clamping pressure. In addition, when we change … Continue reading

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Q: I’m running a chemical cleaning process on stainless steel to remove the oxides and to enrich the chromium depleted areas again surface. It’s an acid pickling process, where mixtures of hydrofluoric acid (HF) and nitric acid (HNO3) are used. I’ve tried Hastelloy C276 bolting on my tanks because I thought … Continue reading

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I have a high temperature and strength application when would I choose Waspaloy bolts verses Inconel 718 bolts? Great question. Waspaloy and Inconel 718 bolts are both excellent in high temperature strength situations. In terms of strength, Inconel 718 has a edge over Waspaloy offering 210 ksi (ultimate tensile strength) … Continue reading

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Q: I’m using a pretty corrosive wet process to produce phosphoric acid. It involves taking phosphate rock and the addition of concentrated (93%) sulfuric acid in a series of well-stirred reactor. Any ideas on bolting that won’t corrode my bolts and fasteners? A: Since your process is exposed to both … Continue reading

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Q: I’m using HCl in a pickling process and have used Hastelloy C276 bolts to protect my equipment but am still having corrosion issues. Any ideas? A: In pickling processes ferric chloride is created which is a strong oxidizer and most pickling process are at elevated temperatures – Hastelloy C276 … Continue reading

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Q: I’m operating a FGD (Flue Gas Desulphurization) plant and am experiencing some mild corrosion on my scrubber bolting. I’m currently using Incoloy 825 bolts. It’s mild corrosion but non-the-less I’d like to have it cleared up before I get additional issues. Any suggestions? A: Since scrubber liquids and gases … Continue reading

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Q: We have a corrosive application and we are debating on using coated carbon steel bolts and nuts or a solid corrosion resistant alloy. Obviously the coatings cost a lot less but we are unsure about how the coatings affect mechanical strength. A: Coated bolts and nuts are typically undersized … Continue reading

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Q: I’m running a lithium extraction process where a mineral called spodumene is roasted in a mixture of sulphuric acid (95-97%) at at about 150°C to form lithium sulfate. I’ve to use Hastelloy C276 for some process equipment but I’m still experiencing corrosion. Please help. A: Hastelloy C276 bolts typically … Continue reading

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Q: I am considering using Inconel 718 fasteners with a Monel K-500 flange in seawater. I’m concered as Inconel is the more anodic of the two and is also has a smaller surface area. Would this cause galvanic corrosion? A: This is a great question. In this case if you plan … Continue reading

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Q: I’m running a municipal solid waste incinerator and am having trouble corrosion from a combination of hydrochloric acid and sulfuric acid that is derived from chloride and sulfur containing compounds in the waste fuel stream. I was using Duplex steel bolts for the chloride corrosion but they aren’t holding up … Continue reading

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Q: I’m running a municipal solid waste incinerator and am having trouble with corrosion from a combination of hydrochloric acid and sulfuric acid that is derived from chloride and sulfur containing compounds in the waste fuel stream. I was using Duplex steel bolts for the chloride corrosion but they aren’t holding … Continue reading

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Q: I have a lightweight application that requires high strength. I’ve tried aluminum screws because I thought they were ultra lightweight but after breaking I increased my bolt size and now I have more weight and still breakage. No sure what to do. A: Yes aluminum is a lightweight material … Continue reading

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Q: My customer is having an issue with his stainless steel fastener bending. They are being used in a high-heat application running at approximately 1600F. Is this normal? Any ideas? A: This is definitely expected at these temperatures. If temperature and strength are you main focus, I would suggest either … Continue reading

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Q: I’m running a hydro-treating process that is running at 350-390°C where we’re producing H2S and NH3. Any ideas on a bolt that can handle the temperature and chemicals? A: In this type of process you having to deal with high temperatures and the formation of sulfuric acid (H2SO4) from the H2S especially … Continue reading

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Q: I have a high strength application that requires resistance to damp salt air and occasional sea splash, I’m using Monel 400 but it’s not holding up the the 75ksi of yield I need. Lots of broken bolts? Is is corrosion or strength? Thoughts? A: Your issue isn’t the corrosion. … Continue reading

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Q: Is AL6XN a steel or nickel alloy? Trying to figure out if it would perform as well as Monel in seawater. A: To answer your first question, AL6XN bolts are actually both a nickel and a steel alloy. AL6XN is often described as a high nickel content stainless alloy. Though … Continue reading

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Q: I need bolts for a well pump exposed to sour gas? I’ve currently use Incoloy 825 bolts which works reasonably well, but I’m wondering if there is a better choice that is more economical and could offer equal or better corrosion resistance – any ideas? A: A great nickel alloy bolt … Continue reading

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Q: I’m looking for guidance on fasteners with good resistance exposure to sodium hypochlorite. The material would need to be bleach-resistance, but also have a tensile yield strength of over 80ksi.

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Nickel alloys are a special class of metals containing high levels of nickel (often greater than 20%). They play a key role in industry for their unique combination of high strength, corrosion resistance to harsh acids (like hydrochloric and sulfuric) and high temperature stability. This two-part newsletter will help summarize the distinct benefits of the … Continue reading

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Oilfields are subjected to a diversity of corrosive elements including carbonic acids, sour gas (H2S), and fracking/stimulant acids such as hydrochloric and hydrofluoric acid. Naphthenic acids and simple organic acids are also found in crude oil extraction. In conjunction to acids, these environments contain sand and other abrasive elements which … Continue reading

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Q: I have a high temperature application which is exposed to sulfur and chloride gasses. We’re operating at between 1200° and 1400°F. Any suggestions on a bolt material to consider? A: To deal with both sulfuric/chloride atmospheres as well as high temperatures, you may want to consider Incoloy 800HT bolts … Continue reading

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Special Fasteners China. offers hose clamps in Titanium and Hastelloy C276. This newsletter overviews the two styles available – worm drive and medium duty – as well as highlight what materials are best for your application. Titanium Grade 2 hose clamps are in stock and available in the sizes shown here. Hastelloy C276 hose clamps are custom made to order … Continue reading

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Q: Inconel 625 and Hastelloy C276 bolts seem to have similar Nickel content. Does this mean these fasteners will perform the same in a corrosive environment? A: Inconel 625 and Hastelloy C276 bolts do offer similar corrosion resistance but Hastelloy C276 has a slight edge in many acidic environements, especially … Continue reading

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Q: I’m working with boiling sulfuric acid and tried Alloy 20 for some of my bolting but am having corrosion. I’m confused as I thought that is what they are best for. Any suggestions. A: You are right Alloy 20 does typically perform very well in sulfuric acid and even … Continue reading

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Q: I have down hole application containing sour gas and high chloride levels. The temperature the bolts are exposed to is around 150F and I’m having trouble with cracking. I tried Super Duplex 2507 but am still having issues. Any ideas? A: Super Duplex 2507 does provide good resistance to … Continue reading

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Q: I need high yield strength material what is the difference between MP35N and A286? Which is more economic? A: Overall MP35N is perhaps the highest yield strength bolt material available to industry with a typical yield of 250 ksi compared to A286’s 111 ksi; though it is extremely expensive. A286 … Continue reading

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Q: I need a material that will be suitable for oil and gas use. Submersion in hydrogen sulfide, carbon dioxide, hydrocarbons, salt water at temperatures up to 325F. Crevice corrosion has been a factor. Also need 170ksi min tensile strength. Plus we’d like to torque a 3/8-24 fastener to 50 … Continue reading

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Q: I needed a lightweight fastener and tried aluminum but it can’t come close to sustaining the weight of my application. Can you suggest anything compatibly light weight that is stronger? A: Titanium mass is about 50% less than steel however when compared to aluminium is still about 60% heavier. … Continue reading

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Q: I need to attach an LNG cryogenic pump and need to make sure I use a material that can withstand temperatures of –120 °F as well as don’t embrittle when fluctuating back to room temperature. Any suggestions? A: Monel K500 is a common choice for cyrogenic fasteners. It can … Continue reading

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Hastelloy alloys have long been the gold standard of corrosion resistant bolts; only out performed by metals like Zirconium and Tantalum. This family of high performance nickel alloys can handle strong acids like hydrochloric, sulfuric, acetic, formic and phosphoric acids, yet each grade actually exhibits its own strengths in dealing with specific acids and niche environments. … Continue reading

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Q: I was planning on using Hastelloy C276 in hot sulfuric acid. It would be approximately 50% concentration around 100F +/- 10 degrees. Will this be okay? I’m just concerned because I read that it cannot handle strong oxidizing environments and I’ll be using it in an application where its … Continue reading

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Q: I have a salt water environment with high velocities and a lot of debris including sand, dirt and particles. Because of the amount of debris, I’m concerned about what material would work best. A: Both Monel and Titanium can be good choices in this situation. Both perform extremely well … Continue reading

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Q: I’m using sodium hypochlorite to control slime and bacteria formation in a power plant water system. It’s in about a 15% solution. I tried using Duplex fasteners thinking they are good with chlorides but I’m having corrosion issues. Any suggestions? A: I think the problem you have is the fact … Continue reading

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Q: We are running a steel pickling process are considering switching from a sulfuric acid process to hydrochloric acid. Our system currently uses Inconel 625 bolting. With this be sufficient? A: Inconel 625 is a good material for acid corrosion but for large system of hydrochloric acid, especially with the … Continue reading

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Q: I chose Tantalum bolts for their corrosion resistance and high temperature capabilities and they are breaking. I’m running an application that fluctuates between 350 Celcius where there could be concentrated sulfuric acid contamination. I thought these would be excellent with high temperature acid exposure. Can you help me? I … Continue reading

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Q: I’m working on a structural project that not submerged in salt water but exposed to moist salt air. I’m not only concerned about the supports having fasteners that won’t corrode but also having a fastener that is high strength. Any suggestions. A: Though I don’t know the specific strength … Continue reading

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Q: I’m using zirconium fasteners in a sulfuric acid process but they are showing corrosion. I’m not sure why as I’m well below boiling and only using 40% concentration. There may be some downstream contaminants, but not much. Any ideas? A: It is most likely the contaminants that are causing … Continue reading

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Q: I’m running a steam surface condenser which is installed on a steam turbine in a thermal power station. I’m using sea water that could be contaminated with chemical pollutants cooling water side of the condenser. Any ideas on a good fastener for the tubes and water boxes? A: Duplex 2205 … Continue reading

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Q: I’m using hydrogen fluoride used in a manufacturing process to make refrigerants. I know it’s very corrosive and have tried both hastelloy and inconel fasteners, which I thought were super corrosion resistant. What am I doing wrong because the acid is still eating them? Should I try Tantalum? A: … Continue reading

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Q: I’m working on a on a geothermal energy drilling project. Carbon steel we’re currently using to bolt drilling components is failing from corrosion. We have corrosive an environment with high levels of sulfur and salt, as well as temperatures to 260C. Any suggestions? A: Super Duplex 2507 is often used … Continue reading

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q: What bolting material should be used with Inconel 625 flanges? We used ASTM A193 Gr B7 however noticing some corrosion issues. A: This is a very common problem but to answer it accurately, it depends on the environment that your flanges see and also to a certain extent what … Continue reading

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They rhyme, are both used in extreme environments, and are both nickel metal alloys, but Monel and Inconel are actually very different. But how? Let’s start with basic chemistry. Monel is a nickel-copper alloy and Inconel is a nickel-chromium alloy. So what does that mean for your extreme application? We … Continue reading

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Q: I’m running a semiconductor wet chemical etching process that utilizes 85 % phosphoric acid at around 150-160°C. I need a material that can withstand this process. Super Duplex hex bolts are not cutting it. A: At that particular concentration and temperature high performance nickel alloys like Hastelloy C276 bolts … Continue reading

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Q: I have a waste water purifying situation where I’m using chlorine to treat the water. In addition to the acidic solution produced the fastener will also experience high loads, so I’m also concerned with stress corrosion cracking. Currently Super Duplex 2507 is not doing the job. Any recommendations on … Continue reading

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Q: We have a pulp & paper digester that is used to cook wood chips in an alkaline solution. The fasteners will be exposed to high temperatures and abrasive conditions. Any suggestions? A: Without knowing the specifics of your process, I can make two general material suggestions. Duplex 2205 fasteners are … Continue reading

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Q: I have a robotic application where I need a fastener that is both lightweight and strong. Also, the style of the fastener needs to provide a wide clamping area in a low clearance area. Any suggestions? A: A material you might consider is Titanium, grade 5. The most common … Continue reading

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Q: Is there any advantage of using a Hastelloy B3 fastener over a B2 fastener? A: Both Hastelloy B2 and B3 fasteners provide good resistance to non-oxidizing acids, such as hydrochloric acid and sulfuric acid. The only advantages of Hastelloy B3 fasteners over B2, is that they offer enhanced thermal stability … Continue reading

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Q: I saw on your high temperature chart that Molybdenum is listed twice. I’m confused, which high temperature should I use? A: Both high temperatures are accurate, depending on the situation where you are using Molybdenum fasteners. Molybdenum screws can be used up to 2912F only if it is used … Continue reading

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Q: What is the difference between Incoloy 825 and 925 bolts? A: Bolts made from Incoloy 925 are precipitation hardened version of Incoloy 825 bolts. What this means is it is put through a heat treatment process which hardens the alloy at the atomic level. Basically Incoloy 925 bolts offers similar … Continue reading

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Q: I’m currently using Monel 400 hex head bolts in salt water. Should I be using K500? What’s the difference? A: Basically, Monel K500 is a precipitation hardened version of Monel 400. This means the material goes through a heat treating process that changes the alloy’s structural matrix to increase its tensile and … Continue reading

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Q: I have a seawater application where the water can be stagnant or polluted. Is Monel bolts the best choice? A: For stagnant seawater application we would usually suggest Titanium over Monel fasteners. Although Monel is very resistant to saltwater, it can experience pitting corrosion in stagnant water situations. There have … Continue reading

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Q: What is the highest temperature I could use Inconel 718 bolts? A: Inconel 718 fasteners could be used reliably up to about 1300F. Because Inconel 718 is heat treated or age hardened at 1325F, going beyond 1300F will significantly affect its strength properties. Furthermore, its strength may not fully return. … Continue reading

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Thread galling is a common yet a seldom understood fastener problem seen by engineers and fabricators. It occurs when pressure and friction cause bolt threads to seize to the threads of a nut or tapped hole. The fasteners are not just overly tight but “cold/contact” welded together.

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Q: When do you recommend to use a threaded flange? I need a flange that can be changed easily & frequently. A: After speaking with the customer, I found out that he has a pilot plant where he will be frequently changing parts. In this case a threaded flange is … Continue reading

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Q: How do I calculate the actual break force or yield of a bolt for a particular size? A: The Ultimate Tensile properties for a material like Hastelloy C276 is independent of the size of the bolt, as its based on the x-sectional area of the bolt which typically … Continue reading

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Q: When is it best to use a lap joint flange? A: Lap joint flanges are good for very expensive materials like tantalum and zirconium and other specialty alloys like Hastelloy or Inconel due to reduced cost of sleeve vs solid flange. Lap joint flanges are unique in that they … Continue reading

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Q: What is the difference between Zirconia and Zirconium? A: Zirconia is a ceramic made from ZrO2 and Zirconium (Zr) is a refractory metal element found on the periodic table. So while Zirconia is made from Zirconium they are VERY different.

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Q: We need advice on a material that will deliver a tensile strength of 210 to 250 ksi, as well as help us protect against galling. The attaching areas are stainless steel Grade 8. A: For this instance, we would suggest MP35N. This alloy was developed specifically for high … Continue reading

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Q: I’m using a high temperature vacuum furnace at 2500F. What type of material do you suggest using and is there any advantage of using a metal over a ceramic? A: Under vacuum conditions with little to no oxygen present, there are some metallic options for fasteners which include … Continue reading

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Q: Is Alloy 330 Magnetic? A: Though alloy 330 does contains iron and chromium, it also contains nickel. The nickel component is what helps to strengthen the protective qualities of the chromium however, the presence of nickel also makes this metal non-magnetic. The reason is that the presence of … Continue reading

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Q: Can dissimilar (also called galvanic) corrosion occurs between Inconel bolts and regular carbon steel? A: Anytime you have dissimilar materials you have the potential for galvanic corrosion. For this to happen the materials need to be wet or in some kind of solution. If they are dry it’s … Continue reading

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