a = DIN 934 M8 s = 2mm => b = M8x14 (8.0.000.18) s = 4mm => b = M8x16 (8.0.000.19) s = 6mm => b = M8x18 (8.0.000.02) s = 8mm => b = M8x20 (8.0.009.11) s = 10mm => b = M8x22 (8.0.002.62)
a= BR8 b= 0.0.480.48 c = DIN 912 M8x16 (0.0.647.64) a = BR10 b = 0.0.625.04 c = DIN 912 M8x18 (0.0.652.76) a = BR12 b = 0.0.003.63 c = DIN 912 M8x20 (8.0.004.41)