... 2.Many types. boltBolts and Nuts Fasteners bolt and nut Material:carbon or alloy steel Surface:ZP,HDG etc Size ... ,9.8,10.9,12.96.Standard:DIN,ANSI/ASME,BS,GB,JIS,non-standard(DIN933,DIN931,DIN934 etc or BS917 ... you to get whatever you want.Fasteners bolt and nut Material:carbon or alloy steel Surface:ZP,HDG etc ... 8,10.9,12.9 6.Standard:DIN,ANSI/ASME,BS,GB,JIS,non-standard(DIN933,DIN931,DIN934 etc or BS917 ...