... is capable 3.Grade:4.8 ,6.8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What’s the specification of ... our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is ... Steel,The material are always use C1022 ,The percent of C element is 0.18%-0.23% ,is higher ...