1.achieved ISO9001:2000 2.Standards:DIN,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, BS, GB, JIS, Non-standard2. Material: Carbon steel, stainless steel, alloys steel.3. Class: 4.8,8.8 ... expressway with mechanical property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big ...