BIG HEAD,SPECIAL HEAD SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener ... :4.8 ,6.8,8.8,9.8.. BIG HEAD,SPECIAL HEAD SCREW,WHITE PHILLIPS HEAD SCREW . A good non-standard fastenerS manufacturer for ... ","BSW"threads for Machine threads.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 type ...