... Size(mm) Grade Specification BoltNut WasherTitanium screws(M3-M20)*Length(5-160)mmM3-M30M4-M16Gr1,Gr2,Gr5,Gr7,Gr9,Gr12,Gr23DIN912 ... 4. Grade:Gr1,Gr2,Gr3,Gr5,Gr7,Gr9,Gr12,Gr23 5. Application:chemical industry,aerospace,spaceflight,surgical implants,as the parts ... one of the extensive and reliable supplier in China. Hex socket titanium screw with taper head