... material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS,GB ... bolt, non-standard nut, non-standard screws, egg neck bolt, fishbolt, countersunk head bolt. Expansion bolt, expansion screw. ... gaskets, spring washers, mechanical bolts, tapping screws, fibreboard screws and hexagonal wood screws, etc. We can also process non-standardfasteners ...