... 2. material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS ... steel,stainless steel,alloy steel.3.class:4.8,8.8,10.9,12.9.etc4.Surface:plain,zinc ... of expressway with mechanical property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big ... of Grade 4.8, 8.8, 10.9 and ANSI Grade 2, 5 and 8.7. Various nuts, flat gaskets, spring washers ...