Special Fasteners China. & Fastener offers fasteners per ASTM F2281 specification. This spec covers the chemical and mechanical requirements for stainless steel and nickel alloy bolts, hex cap screws, and studs, 1/4 inch diameter and larger that are intended for use at temperatures up to 1800°F (982°C). ASTM F2281 is important for applications where heat and the effects of high temperature are critical. Specialty material fasteners produced from Alloy 330, Inconel, and A286 / Alloy 660 are all covered by this specification.