A Fe-Ni-Cr alloy 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 pan head screw features and benefits
Pan head screws made from A-286 are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A-286 screws with high levels of strength from room temperature up to about 1300°F (700°C).
A-286 pan head 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, A-286 pan head screws are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.
Resources: A-286 Torque Specs
Pan head screws are flat on top and rounded on the sides. A286 pan head screws are ideal for:
- Small diameter fasteners – especially when the fastener size needed is too small for a wrench.
- When phillips or slotted drivers are desired. For many high strength specialty alloys, only slotted drives are available.
- Low torque applications because the drivers don’t offer as much force as a wrench.
- Large diameter head provides more clamping area.
How Are They Different from Button Head Screws?
A286 pan head and button head screws have very similar profiles however, button head screws allow for a hex socket driver whereas pan head screws do not.
A-286 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).
A-286 Specifications: AMS 5525, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, UNS S66286, Werkstoff 1.4980