DIN 7991   

*All measurements in millimeters (mm)*

d b t e s k max d1
M3 12 1.2 2.3 2 1.7 6
M4 14 1.8 2.87 2.5 2.3 8
M5 16 2.3 3.44 3 2.8 10
M6 18 2.5 4.58 4 3.3 12
M8 22 3.5 5.72 5 4.4 16
M10 26 4.4 6.86 6 5.5 20
M12 30 4.6 9.15 8 6.5 24
M16 38 5.3 11.43 10 7.5 30
M20 46 5.9 13.72 12 8.5 36
M24 54 10.3 16 14 14 39

All information is strictly informative