Alloy 660 stainless steel with excellent high temperature oxidation resistance

• Good material for high temperature oxidation resistance
• Maintains high strength at elevated temperatures
• A286 Chemistry, specs, and heat treatments
• A286 button head cap screw features and benefits

A286 button head cap screws or alloy 660 stainless steel button head cap screws are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A286 screws with high levels of strength from room temperature up to about 1300°F (700°C).

A286 button head cap screws are mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1300°F (700°C) in conditions that would typically be found in high temperature exhaust streams.

Because of these properties, A286 button head cap screws are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.

Resources: A286 Torque Specs

Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

A286 Button Head Cap Screw Features & Benefits

A286 button head cap screws combine the similar shape of a pan head with the driver of a socket head. The socket driver is ideal for low clearance applications that require a large area clamping face. Compared to a standard socket head cap screw, A286 button heads have a lower and wider profile. This can be useful when the clamping material is too thin to counter-bore.

Advantages

• Wide bearing surface for clamping
• Low profile head

A286 Chemistry, Specifications & Heat Treatments

A286 Heat Treatments:  There are several heat treatment combinations for A-286 all with slight variations in performance. They can be specified via an AMS number or a 660 Class: A, B, C or D,  with most common specified as class A or D.   The A-286 grades A, B and C all have the same min tensile strength and min yield strength of 130ksi and 85ksi respectively. However grade D is significantly better yield with a min tensile of 130ksi and a min yield of 105ksi. 

By AMS numbers, the most common for A-286 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B). 

A286 Specifications: ASTM A453, AMS 5525, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, UNS S66286, Werkstoff 1.4980

Mechanical Properties