Copper Bolts,Brass 1.ISO,ANSI,CE,JIS,DIN,BS& non-standard ... .8 ,6.8,8.8,9.8.... Copper Bolts,Copper Bolt,Brass Bolts.1.What’s the specification of our Products ? MaterialsCarbon ... available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21 ...