ABOUT BOLTS : RECOMMENDED TORQUES
Torque or moment = is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist to an object. Mathematically, torque is defined as the cross product of the lever-arm distance and force, which tends to produce rotation.
| Nominal thread | Grade | ||||||
|
4.6 |
4.8 | 5.8 | 8.8 | 9.8 | 10.9 |
12.9 |
|
| (metric) | Torque (Nm) | ||||||
| 2.5 |
0.30 |
0.38 | 0.48 | 0.77 | 0.87 | 1.05 |
1.36 |
| 5 |
2.55 |
3.50 | 4.50 | 7.10 | 8.00 | 10.00 |
12.00 |
| 8 |
11.00 |
14.70 | 18.50 | 29.50 | 33.00 | 41.00 |
49.00 |
| 10 |
21.50 |
29.00 | 36.00 | 58.00 | 66.00 | 82.00 |
98.00 |
| 16 |
95.00 |
125.00 | 158.00 | 250.00 | 282.00 | 355.00 |
420.00 |
| 20 |
180.00 |
240.00 | 305.00 | 490.00 | 550.00 | 690.00 |
830.00 |
| 24 |
315.00 |
420.00 | 530.00 | 850.00 | 955.00 | 1195.00 |
1430.00 |
| Grades equivalence (only as guiding comparison) | |||||||
| Metric
6.8 8.8 9.8 10.9 12.9 |
USA
3 5 6 8 |
British
P R T V X |
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