... thread 1. standard: non-standard. 2. material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN , ... ANSI/ASME,BS,GB,JIS,Non-standard2.Metail:Carbon steel,stainless steel,alloy steel ... and 12.9.5. Stainless steel internal and external hexagon bolt products: A2-70, A4-80. Material: 304, 316, 316L.6 ...