... : steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS,GB,JIS ... non-standard nut, non-standard screws, egg neck bolt, fishbolt, countersunk head bolt. Expansion bolt, expansion screw.etc.Specialized in manufacturing ... as bolts,screws,studs,nuts,washers,threaded Rods,pins,rivets,stamping,circlips and other nonstandard parts.Shanghai Jinrui Norm ...