Selected sizes used for CE (UKCA) marked BS EN 15048 Non-preloaded structural bolting assemblies
| Diameter (d) | M12 | M16 | M20 | M22 | M24 | M27 | M30 | M33 | M36 |
|---|---|---|---|---|---|---|---|---|---|
| Thread pitch (P) | 1.75 | 2 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 |
| k (nom) | 7.5 | 10 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 |
| k (Grade A) | 7.32-7.68 | 9.82-10.18 | 12.285-12.715 | 13.785-14.215 | 14.785-15.215 | – | – | – | – |
| k (Grade B) | 7.21-7.79 | 9.71-10.29 | 12.15-12.85 | 13.65-14.35 | 14.65-15.35 | 16.65-17.35 | 18.28-19.12 | 20.58-21.42 | 22.08-22.92 |
| s (nom/max) | 18 | 24 | 30 | 34 | 36 | 41 | 46 | 50 | 55 |
| s (min, Grade A) | 17.73 | 23.67 | 29.67 | 33.38 | 35.38 | – | – | – | – |
| s (min, Grade B) | 17.57 | 23.16 | 29.16 | 33.00 | 35.00 | 40.00 | 45.00 | 49.00 | 53.10 |
| e (min, Grade A) | 20.03 | 26.75 | 33.53 | 37.72 | 39.98 | – | – | – | – |
| e (min, Grade B) | 19.85 | 26.17 | 32.95 | 37.29 | 39.55 | 45.20 | 50.85 | 55.37 | 60.79 |
As per BS EN ISO 4017:2022
Dimensions in millimetres
| Size | Grade A | Grade B |
|---|---|---|
| M12 (l) | Up and including 120 | Above 120 |
| M16 (l) | Up and including 150 | Above 150 |
| M20 (l) | Up and including 150 | Above 150 |
| M22 (l) | Up and including 150 | Above 150 |
| M24 (l) | Up and including 150 | Above 150 |
| M27 (l) | – | All lengths |
| M30 (l) | – | All lengths |
| M33 (l) | – | All lengths |
| M36 (l) | – | All lengths |
As per BS EN ISO 4017:2022
↫ Go backWhilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.