A286 / Alloy 660 for excellent high temperature oxidation resistance
- Good material for high temperature oxidation resistance
- Maintains high strength at elevated temperatures
- Specs & heat treatments
- A286 chemistry
- ASTM A453 Grade 660
- A286 Datasheet
A286 screws, also known as Alloy 660 screws are stainless steel alloy which contains iron, nickel and chromium. A286 hex heads are known for their high strength, creep resistance and oxidation resistance at elevated temperatures once age hardened. As a result, A286 hex head screws provide high levels of strength from room temperature up to about 1300°F (700°C).
A286 hex head cap screws are also mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1500°F (815°C) in conditions that would typically be found in high temperature exhaust streams.
Because of the properties of Alloy 660 / A286, these hex head screws are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications. In addition, A286 / Alloy 660 is also non-magnetic and finds a niche in non-magnetic cryogenic equipment. In addition, we can offer fasteners to ASTM A453 Grade 660 specification. This specification ensures tensile and stress rupture properties for critical high temperature 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
It is important to differentiate between a A-286 hex head cap screw and hex head bolt. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, A-286 hex heads offer strong, stable joints because of their large head service.
The Hex Comparison
|Hex Head Cap Screw||Hex Head Bolts|
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A286 / Alloy 660 Hex Head Cap Screw Advantages
The most important feature of a Alloy 660 / A286 hex head cap screws is that it has a larger bearing surface area which provide better clamping pressure than other type of fastener such as a socket head cap screw. Additionally, since debris build up is less of an issue with this style of fastener verses a socket head cap screw, they are ideal of dirty applications where particles could clog up a socket. Though A286 socket heads are typically used for tight access applications, hex heads can be a better choice when there is only side clearance available for tightening.
Material specification ASTM A453 Grade 660 applies to bolts, studs, studs and other fasteners. It ensures fasteners meet strength standards for use in high temperature bolting applications. ASTM A453 Grade 660 is classified into 4 property classes / heat treatments: A, B, C & D, each designated with different tensile and stress rupture properties. The most common of the ASTM 453 classes are class A or D. The grades A, B and C all have the same minimum tensile strength and minimum yield strength of 130ksi and 85ksi respectively. However grade D has a significantly better yield with a min tensile of 130ksi and a min yield of 105ksi.
AMS A286 / Alloy 660 Heat Treatments
By AMS numbers, the most common for A286 / Alloy 660 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B).
A286 / Alloy 660 Cold Worked Fasteners
For additional strength, A286 could be aged and cold worked to achieve a min ultimate tensile strength of 160ksi upon request.
UNS S66286, ASTM A453, AMS 5525, AMS 5726, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, Werkstoff 1.4980, ASTM F2281