Inconel 718 hex bolts are precipitation hardened bolts made from an alloy containing nickel as a base element, chromium and molybdenum, with additions of aluminum, titanium and cobalt. This alloy combines corrosion resistance and high strength with excellent weldability, including resistance to post-weld cracking. Inconel 718 has excellent creep rupture strength at elevated temperatures. Inconel 718 fasteners have been used in gas turbines, rocket engines, spacecraft, nuclear reactors, pumps and tools.