... ,BS,GB,JIS,Non-standard 3.Class:4.8,8.8,10.9,12.9 4.Surface:customers demand 1. Standards: DIN ... steel, stainless steel, alloys steel.3. Class: 4.8,8.8,10.9,12.9.etc4. Surface: plain, zinc plated, black oxide ... with mechanical property of Grade 8.8, 10.9 and 12.9.5. Stainless steel internal and external hexagon bolt ... bolt with the mechanical property of Grade 4.8, 8.8, 10.9 and ANSI Grade 2, 5 and 8 ...