DIN933 standard for hexagon bolts, class A and class B, with thread diameters m1.6-m52. General thread diameter specification for m3-m64, general carbon steel performance registration for the mian 8.8 class, 10.9 class. When d≤39mm, you can refer to ISO898-1, stainless steel is usually A2-50/A2-70/A4-70/A4-80, when d≤39mm, you can refer to ISO3506-1 or DIN267-11.DIN933 hexagon bolts are generally metric (coarse teeth) and fine teeth, measured in mm. DIN 933 coarse thread tolerance: 6g.