Standard:DIN931,933,960,961,912,7991,6914,6921,558,ISO4017,4014, IFIA-10(UNC,UNF),ASTM A325 

Size: M4-M64,  1/4'-2'

Grade:4.8, 6.8, 8.8, 10.9, 12.9. 5,8,10 

Material:Carbon steel(35K,45#),Alloy steel (40Cr)

Finish: Plain,Black,Z/P,Z/P CR3+,HDG,Dacromet