... non-standard. 2. material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME ... and ANSI Grade 2, 5 and 8.7. Various nuts, flat gaskets, spring washers, mechanical bolts, tapping screws, fibreboard screws and ... ", Jinrui has won the trust of our customerswith advanced office system and strong operation team. We produce "Jinrui" brand standard ...