Category Archives: Uncategorized

Sulfuric Acid: Which Fastener Material is Best?

Posted on September 6, 2022 by Kathleen

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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What Does Specification ASTM F2281 Mean?

Posted on November 18, 2021 by Kathleen

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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Oxygen Compatibility – What materials are best?

Posted on July 2, 2021 by Kathleen

Q: We are looking for some socket head cap screws that would be manufactured from a Monel bolt for oxygen environment – What material would you recommend? A: Monel 400 would be a great choice for oxygen compatibility since it has very low spark initiation potential. The ignition of alloys and metals … Continue reading →

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Titanium Gr5 versus Monel K500 Bolts in Sea Water

Posted on May 18, 2021 by Kathleen

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 →

Posted in Application, Corrosion Resistance, FAQs, High Strength, Material, Specialty Metal Fasteners, Uncategorized | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , | Leave a comment

Cryogenic Gaskets for Liquid Hydrogen and Hydrogen Gas

Posted on February 15, 2021 by Kathleen

Q) I have cryogenic liquid hydrogen and hydrogen gas in my process and having a really hard time controlling leaks from flanges. All the gaskets I have used don’t seem last very long before leaking and cannot be tightened any further. Do you have any suggestions for dealing with this … Continue reading →

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Hastelloy Bolts for Saltwater & Sulfuric Acid

Posted on September 1, 2020 by Kathleen

Can I use Hastelloy bolts in a combination of salt water and acid? I have salt water process that has some sulfuric acid contamination? Can it handle this? Temperature would be around 100F. A: Yes, Hastelloy bolts are virtually inert to salt water environments and the combination of salt water … Continue reading →

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Bolts to Meet NACE Oil & Gas Specs

Posted on March 17, 2020 by dean

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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Nickel 200 Bolts for Chlor Alkali Process

Posted on October 22, 2019 by dean

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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Titanium Grade 5 Screws for Salt Walter & High Strength

Posted on March 6, 2018 by dean

Q: Can you give me a recommendation for a fastener material for a vibrating screen in a mineral processing plant which uses salt water? I’m not sure of selecting a material that combines fatigue loading strength and anti-corrosion. A: Though I don’t know the specifics of the load strength you … Continue reading →

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Bolt for hot hydrogen sulfide, CO2, hydrocarbons & salt water

Posted on August 9, 2017 by dean

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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Fastener for cyrogenic application

Posted on August 3, 2017 by dean

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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Most Common of Hastelloy Fasteners Reviewed

Posted on July 25, 2017 by dean

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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Difference between titanium grade 5 and grade 2 screws

Posted on July 24, 2017 by dean

Q: What exactly is the difference between Titanium grade 2 and 5 fasteners? A: The primary difference is strength. A titanium grade 2 fastener is made of commercially pure titanium where as a grade 5 fastener is a titanium alloy with 6% aluminum and 4% vanadium. This helps to provide Grade 5 … Continue reading →

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Monel bolts for steel seawater platform

Posted on July 18, 2017 by dean

Q: I’ve been using Monel bolts to attach a steel platform in a seawater situation, but have experienced some mild corrosion. Not sure why and any suggestions on a better material? A: Monel is excellent in sea and salt water conditions. Two scenarios could have caused the corrosion. First, if … Continue reading →

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High strength bolt for high temperature 600C application

Posted on July 14, 2017 by dean

Q: I have a load bearing application in that requires a material that can handle temperatures at plus/minus 600C? Would Titanium grade 5 work? I know it’s super strong. A: Titanium is a strong material, especially grade 5 which is half the weight and 4 times as strong as 316 steel, … Continue reading →

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Ceramic fastener compatibility with metal

Posted on June 30, 2017 by dean

Q : I am looking to purchase a ceramic threaded rod, but I was curious as to its compatibility with metal. The mount I intend to use made of stainless steel; would this mate well with a ceramic rod? A: While you might be able to thread the ceramic rod into … Continue reading →

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Best flange for high pressure hydrochloric acid

Posted on March 24, 2017 by dean

Q: I have a high pressure application with HCl at fluctuating temperatures. Can you recommend the best flange to provide a safe secure joint? A: Hands down, the weld neck flange is best for these types of hazardous, high pressure applications. Weld neck flanges are easily identified by their long … Continue reading →

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Best uses for a threaded flange

Posted on March 24, 2017 by dean

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 →

Posted in Corrosion Resistance, FAQs, High Strength, High Temperature Resistance, Lightweight, Non-Conductive, Specialty Metal Fasteners, Ultra Purity, Uncategorized | Tagged , , , , , , | Leave a comment

Difference between ziconium and zirconia fasteners

Posted on February 8, 2017 by dean

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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Are ceramic fasteners fragile

Posted on February 8, 2017 by dean

Q: Are ceramics fragile? Do I have to worry about them breaking compared to metals? A: Compared to metals ceramic fasteners are indeed fragile. Unlike a metal, there is very little yield before it fractures. Additionally ceramic fasteners and susceptible to thermal shock.

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Cost comparison of Zirconia vs Alumina screws

Posted on February 8, 2017 by dean

Q: Why does Zirconia cost more than Alumina? A: 1) Raw material cost: Aluminia is far more abundant, whereas Yttrium oxide which is a stabilizer for Zirconia ceramic, is a rare earth element. 2) Shaping costs: Due to its higher density it takes approximately 10x longer to grind down and shape … Continue reading →

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MP35N bolts for high strength application

Posted on February 8, 2017 by dean

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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