Type:This specification covers premium quality bolts and screws made from a low-alloy@ heat-resistant steel and having threads of UNJ (MIL-S-8879) form.Application:Primarily for joining parts where a combination of fatigue resistance and high strength is required for applications between -100??(-73?? and +1000??(+538?? in highly stressed locations. A coating@ such as AMS 2416 or AMS 2506@ is recommended for corrosion protection.