Double End Bolt,Special 1.ISO,ANSI,CE,JIS,DIN,BS& ... 8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What’s the specification of our Products ... 20GP will be 20T-26T,A 40GP will be 40T-52T.additioal processes Washer assembly,Heat treatment,Baking hydrogen, ... manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on ...