... ASME,BS,GB,JIS,Non-standard 3.Class:4.8,8.8,10.9,12.9 4.Surface:customers demand 1. ... Carbon steel, stainless steel, alloys steel.3. Class: 4.8,8.8,10.9,12.9.etc4. Surface: plain, zinc plated, ... of expressway with mechanical property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big hexagon ... the mechanical property of Grade 4.8, 8.8, 10.9 and ANSI Grade 2, 5 and 8. 7. Various nuts, flat gaskets, ...