... : ASTM, DIN, GB/T 3.Parts: bolt and nut 4.Woodencase Pure Titanium Bolt: 1. Material: Gr1, Gr2, Gr3, Gr4 ... , titanium cross slot screw.7. Parts: bolt and nut8. Intrinsic Quality: No organization segregation, no high density of its impurities9 ... . Fine texture:A1~A410. Usage: Aerospace, spaceflight, surgical implants, chemical industry, as the parts of the cars,the bikes pure titanium ...