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▣ METRIC Unit : mm
standard (M) H h B standard (M) H h B
M4 7.5 3.5 8 M12 18.5 10 19
M5 7.5 4 8 M14 21 11 22
M6 9.5 5 10 M16 24 13 24
M8 12.5 6.5 12 M18 27 15 27
M8 12.5 6.5 13 M20 29 16 30
M10 15.5 8 14 M22 32.5 18 32
M10 15.5 8 17 M24 35.5 19 38