DIN 7991 Hexagon Socket Countersunk Head Screws
l - length of Bolts
d - the nominal diameter of the thread
t - groove depth
dk - head diameter
s - groove width
DIN 7991 Dimensions for Hexagon Socket Countersunk Head Screws
| d | s | e | dk | t | TORX |
|---|---|---|---|---|---|
| M 3 | 2 | 2.3 | 6 | 1.7 | TX 10 |
| M 4 | 2.5 | 2.9 | 8 | 2.3 | TX 20 |
| M 5 | 3 | 3.5 | 10 | 2.8 | TX 25 |
| M 6 | 4 | 4.7 | 12 | 3.3 | TX 30 |
| M 8 | 5 | 5.8 | 16 | 4.4 | TX 40 |
| M 10 | 6 | 7 | 20 | 5.5 | TX 50 |
| M 12 | 8 | 9.4 | 24 | 6.5 | > TX 50 |
| M 16 | 10 | 11.7 | 30 | 7.5 | > TX 50 |
| M 20 | 12 | 13.9 | 36 | 8.5 | > TX 50 |