Socket head cap screws
DIN 7991 – Hexagon socket countersunk head screws
DIN 7991. Dimensions from the HBS technical datasheet – in stock, with EN 10204 3.1 / 3.2 certificates.
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Dimensions
DIN 7991 dimension tables.
Dimensions in mm
| Thread d | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | – | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 |
| b | l ≤ 125 | 12.00 | 14.00 | 16.00 | 18.00 | 22.00 | 26.00 | 30.00 | 34.00 | 38.00 | 42.00 | 46.00 | 50.00 | 54.00 |
| 125 < l ≤ 200 | – | – | – | 24.00 | 28.00 | 32.00 | 36.00 | 40.00 | 44.00 | 48.00 | 52.00 | 56.00 | 60.00 | |
| l > 200 | – | – | – | – | – | 45.00 | 49.00 | 53.00 | 57.00 | 61.00 | 65.00 | 69.00 | 73.00 | |
| c | – | 0.20 | 0.30 | 0.30 | 0.30 | 0.40 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 1.00 | 1.00 |
| dk | nominal | 6.00 | 8.00 | 10.00 | 12.00 | 16.00 | 20.00 | 24.00 | 27.00 | 30.00 | 33.00 | 36.00 | 36.00 | 39.00 |
| min. | 5.70 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 35.38 | 38.38 | |
| da | max. | 3.60 | 4.70 | 5.70 | 6.80 | 9.20 | 11.20 | 13.70 | 15.70 | 17.70 | 20.20 | 22.40 | 24.40 | 26.40 |
| ds | nominal = max. | 3.00 | 4.00 | 5.00 | 6.00 | 8.00 | 10.00 | 12.00 | 14.00 | 16.00 | 18.00 | 20.00 | 22.00 | 24.00 |
| min. | 2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | |
| e | min. | 2.30 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | 13.72 | 16.00 | 16.00 |
| k | max. | 1.70 | 2.30 | 2.80 | 3.30 | 4.40 | 5.50 | 6.50 | 7.00 | 7.50 | 8.00 | 8.50 | 13.10 | 14.00 |
| r | min. | 0.10 | 0.20 | 0.20 | 0.30 | 0.50 | 0.50 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.60 |
| s | nominal | 2.00 | 2.50 | 3.00 | 4.00 | 5.00 | 6.00 | 8.00 | 10.00 | 10.00 | 12.00 | 12.00 | 14.00 | 14.00 |
| max. | 2.10 | 2.60 | 3.10 | 4.12 | 5.14 | 6.14 | 8.17 | 10.17 | 10.17 | 12.21 | 12.21 | 14.21 | 14.21 | |
| min. | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.03 | 10.03 | 10.03 | 12.03 | 12.03 | 14.03 | 14.03 | |
| t | nominal = max. | 1.20 | 1.80 | 2.30 | 2.50 | 3.50 | 4.40 | 4.60 | 4.80 | 5.30 | 5.50 | 5.90 | 8.80 | 10.30 |
| min. | 0.95 | 1.50 | 2.05 | 2.25 | 3.20 | 4.10 | 4.30 | 4.50 | 5.00 | 5.20 | 5.60 | 8.44 | 9.87 | |
Shank length ls min. and grip length lg max., in mm · M3 – M12
| Length l | M3 | M4 | M5 | M6 | M8 | M10 | M12 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nom. | min. | max. | ls | lg | ls | lg | ls | lg | ls | lg | ls | lg | ls | lg | ls | lg |
| 8 | 7.71 | 8.29 | – | 3.20 | – | 4.40 | – | 5.20 | – | 6.30 | – | – | – | – | – | – |
| 10 | 9.71 | 10.29 | – | 3.20 | – | 4.40 | – | 5.20 | – | 6.30 | – | 8.20 | – | – | – | – |
| 12 | 11.65 | 12.35 | – | 3.20 | – | 4.40 | – | 5.20 | – | 6.30 | – | 8.20 | – | 10.00 | – | – |
| 16 | 15.65 | 16.35 | – | 3.20 | – | 4.40 | – | 5.20 | – | 6.30 | – | 8.20 | – | 10.00 | – | – |
| 20 | 19.58 | 20.42 | – | 3.20 | – | 4.40 | – | 5.20 | – | 6.30 | – | 8.20 | – | 10.00 | – | 11.80 |
| 25 | 24.58 | 25.42 | 10.50 | 13.00 | – | 4.40 | – | 5.20 | – | 6.30 | – | 8.20 | – | 10.00 | – | 11.80 |
| 30 | 29.58 | 30.42 | 15.50 | 18.00 | 12.50 | 16.00 | – | 5.20 | – | 6.30 | – | 8.20 | – | 10.00 | – | 11.80 |
| 35 | 34.50 | 35.50 | – | – | 17.50 | 21.00 | 15.00 | 19.00 | – | 6.30 | – | 8.20 | – | 10.00 | – | 11.80 |
| 40 | 39.50 | 40.50 | – | – | 22.50 | 26.00 | 20.00 | 24.00 | 17.00 | 22.00 | – | 8.20 | – | 10.00 | – | 11.80 |
| 50 | 49.50 | 50.50 | – | – | – | – | 30.00 | 34.00 | 27.00 | 32.00 | 21.75 | 28.00 | 16.50 | 24.00 | – | 11.80 |
| 60 | 59.40 | 60.60 | – | – | – | – | – | – | – | – | 31.75 | 38.00 | 26.50 | 34.00 | 21.25 | 30.00 |
| 70 | 69.40 | 70.60 | – | – | – | – | – | – | – | – | – | – | 36.50 | 44.00 | 31.25 | 40.00 |
Shank length ls min. and grip length lg max., in mm · M14 – M24
| Length l | M14 | M16 | M18 | M20 | M22 | M24 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nom. | min. | max. | ls | lg | ls | lg | ls | lg | ls | lg | ls | lg | ls | lg |
| 25 | 24.58 | 25.42 | – | 13.00 | – | – | – | – | – | – | – | – | – | – |
| 30 | 29.58 | 30.42 | – | 13.00 | – | 13.50 | – | – | – | – | – | – | – | – |
| 35 | 34.50 | 35.50 | – | 13.00 | – | 13.50 | – | 15.50 | – | 16.00 | – | – | – | – |
| 40 | 39.50 | 40.50 | – | 13.00 | – | 13.50 | – | 15.50 | – | 16.00 | – | 20.60 | – | – |
| 50 | 49.50 | 50.50 | – | 13.00 | – | 13.50 | – | 15.50 | – | 16.00 | – | 20.60 | – | 23.00 |
| 60 | 59.40 | 60.60 | 16.00 | 26.00 | – | 13.50 | – | 15.50 | – | 16.00 | – | 20.60 | – | 23.00 |
| 70 | 69.40 | 70.60 | 26.00 | 36.00 | 22.00 | 32.00 | 15.50 | 28.00 | – | 16.00 | – | 20.60 | – | 23.00 |
| 80 | 79.40 | 80.60 | 36.00 | 46.00 | 32.00 | 42.00 | 25.50 | 38.00 | 21.50 | 34.00 | – | 20.60 | – | 23.00 |
| 90 | 89.30 | 90.70 | – | – | 42.00 | 52.00 | 35.50 | 48.00 | 31.50 | 44.00 | 27.50 | 40.00 | – | 23.00 |
| 100 | 99.30 | 100.70 | – | – | – | – | 45.50 | 58.00 | 41.50 | 54.00 | 37.50 | 50.00 | 31.00 | 46.00 |
- d
- Nominal thread diameter
- P
- Thread pitch, coarse
- b
- Thread length
- ds
- Screw shank diameter
- k
- Head height
- s
- Width across flats
- e
- Width across corners
- t
- Groove depth
- l
- Bolt length
- ls
- Shank to thread start length
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