... , DIN, GB/T 3.Parts: bolt and nut 4.Woodencase Pure Titanium Bolt: 1. Material: Gr1, Gr2, Gr3, Gr4, Gr5, Gr7 ... , 5788, 6178~61803.Size: M2~M224. Types of the Head: cheese, hexagon, pan5. Types of the Groove: slot, square socket, phillips recess6 ... and nut8. Intrinsic Quality: No organization segregation, no high density of its impurities9. Fine texture:A1~A410. Usage: Aerospace, spaceflight, surgical ...