DIN 7985   

*All measurements in millimeters (mm)*

d m approx r1 approx a max v approx k d1 max Cross Recess No.
M3 3.1 6 1 1.6 2.4 6 H1
M4 4.6 8 1.4 2 3.1 8 H2
M5 5.3 10 1.6 2.5 3.8 10 H2
M6 6.8 12 2 3 4.6 12 H3
M8 9 16 2.5 3.7 6 16 H4

All information is strictly informative