DIN 7971
DIN 7971 – Slotted Pan Head Self-tapping Screws Dimension
Dimensionn of DIN 7971 as below:
 |
| Size | ST 2.2 | ST 2.9 | ST 3.5 | ST 4.2 | ST 4.8 | ST 5.5 | ST 6.3 | ST 8 | |
| P | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 | |
| a | max. | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 |
| da | max. | 2.8 | 3.5 | 4.1 | 4.9 | 5.5 | 6.3 | 7.1 | 9.2 |
| dk | max. | 4 | 5.6 | 7 | 8 | 9.5 | 11 | 12 | 16 |
| min. | 3.7 | 5.3 | 6.6 | 7.6 | 9.1 | 10.6 | 11.6 | 15.6 | |
| k | max. | 1.3 | 1.8 | 2.1 | 2.4 | 3 | 3.2 | 3.6 | 4.8 |
| min. | 1.1 | 1.6 | 1.9 | 2.2 | 2.7 | 2.9 | 3.3 | 4.5 | |
| n | nominal | 0.5 | 0.8 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | 2 |
| max. | 0.7 | 1 | 1.2 | 1.51 | 1.51 | 1.91 | 1.91 | 2.31 | |
| min. | 0.56 | 0.86 | 1.06 | 1.26 | 1.26 | 1.66 | 1.66 | 2.06 | |
| r | min. | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 | 0.4 |
| rf | approx. | 0.6 | 0.8 | 1 | 1.2 | 1.5 | 1.6 | 1.8 | 2.4 |
| t | min. | 0.5 | 0.7 | 0.8 | 1 | 1.2 | 1.3 | 1.4 | 1.9 |
| w | min. | 0.5 | 0.7 | 0.8 | 0.9 | 1.2 | 1.3 | 1.4 | 1.9 |
| y | Type C | 2 | 2.6 | 3.2 | 3.7 | 4.3 | 5 | 6 | 7.5 |
| Type F | 1.6 | 2.1 | 2.5 | 2.8 | 3.2 | 3.6 | 3.6 | 4.2 | |