DIN 7349    

*All measurements in millimeters (mm)*

d for spring pins
DIN 1481		 for screws s d1
3.2 6 M3 1 9
4.3 8 M4 1.6 12
5.3 10 M5 2 15
6.4 12 M6 3 17
8.4 16 M8 4 21
10.5 18 M10 4 25
13 21 M12 6 30
15 25 M14 6 36
17 28 M16 6 40
21 35 M20 8 44
23 38 M22 8 50
25 40 M24 10 50
31 50 M30 10 68

All information is strictly informative