These Pro-Bolt Flanged Hex Head Titanium Bolts are made from aircraft grade Ti-6AL-4V titanium (Grade 5), the outstanding benefits are rolled threads that feature greater fatigue strength and reduced galling (where friction can cause two titanium components to bond together). These bolts have in excess of 120,000Psi ultimate tensile strength, suitable to replace both Grade 5 and Grade 8 steel bolts or any bolt in a stressed area. They also feature a dished out head with a captive washer (flange). Material Specification: Ti-6AL-4V Ti-6AL-4V, an alloy introduced in 1954, is a good general purpose grade. Its density is 0.160 pounds per cubic inch. It can be heat-treated to ultimate strengths in excess of 170,000psi and responds to heat treatment in sections up to 15mm. This alloy is stable at temperatures ranging from 217°C to over 538°C. Manufacturing Process: CNC machined from a solid bar. Ultimate Tensile Strength: 120,000Psi - 160,000Psi Yield Strength: 115,000Psi - 145,000Psi Weight: