... 8 ,6.8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What’s the ... BSW"thread are available.Head typesHexagon head,Mushroom head,Pan head,Countersunk head,Bugle head,Oval head,Hex flange head,Round head,Ball head,Button head...Socket typesPhillip type,Pozi ... 23% ,is higher than other Carbon Steel .2.Fasteners' Head is much thicker than some other manufacturers ,it is strong ...