... steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS,GB, ... screws, egg neck bolt, fishbolt, countersunk head bolt. Expansion bolt, expansion screw.etc.Specialized in manufacturing fasteners such as bolts,screws,studs,nuts,washers ... team. We produce "Jinrui" brand standard parts with the corporate philosophy of "creating first class enterprise ...