... Titanium Bolt: 1.Material: Gr1, 2, 3, 4, 5, 7, 9, 12 2.Standard : ASTM, DIN, GB/T 3.Parts: bolt ... nut8. Intrinsic Quality: No organization segregation, no high density of its impurities9. Fine texture:A1~A410. Usage: Aerospace, spaceflight, surgical implants ...