... : non-standard. 2. material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME ... property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big hexagon bolt for steel structure, shearing bolt ... and ANSI Grade 2, 5 and 8.7. Various nuts, flat gaskets, spring washers, mechanical bolts, tapping screws, fibreboard screws and ...