ISO 7380-1 A4
BKBM814 M8 x 14 mm [VPE 50]
BKBM820 M8 x 20 mm [VPE 50]
BKBM840 M8 x 40 mm [VPE 50]
BKBM850 M8 x 50 mm [VPE 50]
BKBM8100 M8 x 100 mm [VPE 10]