titanium socket head cap screws:DIN912, DIN931, DIN933, DIN985, DIN125, DIN127, DIN9021, DIN6926 Titanium socket head cap screws : Titanium and Titanium alloy specifications: 1)Common Ground a, Bolt sizes:M2-M22*lengthb, Nut sizes:M2-M22c, Standard:GB,DIN,ASME,BSW,UNC,JISd, GRADE:Gr1,Gr2,Gr3,Gr5,Gr7,Gr9,Gr12,Gr23 2)Difference:a, Titanium for the chemical aspects,PCB equipment,electrodes.b, ...