... ,ANSI/ASME,BS,GB,JIS,Non-standard 3.Class:4.8,8.8,10.9,12.9 4.Surface:customers demand 1. Standards: DIN ,ANSI/ASME ... -standard2. Material: Carbon steel, stainless steel, alloys steel.3. Class: 4.8,8.8,10.9,12.9.etc4. Surface: plain, zinc plated, black oxide ... bolt with the mechanical property of Grade 4.8, 8.8, 10.9 and ANSI Grade 2, 5 and 8. 7. Various nuts, flat gaskets, spring ...