... BS,GB,JIS,Non-standard 3.Class:4.8,8.8,10.9,12.9 4.Surface:customers demand ... steel, stainless steel, alloys steel.3. Class: 4.8,8.8,10.9,12.9.etc4. Surface: plain, zinc plated ... with mechanical property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big hexagon bolt ... for steel structure, shearing bolt with mechanical property of Grade 8.8 ...