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Direct torque
This test represents component resistance when unscrewing a seized nut.
Test conditions:
- grade 10 nut
- High Elasticity Limit metal sheet for hexagonal body, in order to reduce the influence of metal sheet resistance. |
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Direct torque (N.m) |
M 5 |
M 6 |
M 8 |
Round |
3.2 |
6.0 |
10.5 |
Hexagonal |
6.1 |
10.6 |
25.8 |
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Indirect torque
In most cases, indirect torque resistance is higher (even much higher) than recommended maximum tightening torque for 8 grade nuts with a friction coefficient of 0.20.
The value shown in the data sheets has therefore been limited to the recommended maximum tightening torque for 8 grade nuts with a friction coefficient of 0.20.
In other cases, the value shown in the data sheets corresponds to the recommended torque value that is compatible with CLUFIX-STUD™ indirect torque resistance. |
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The hexagonal body guarantees high torque resistance and easy dismantling. |
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Recommended maximum tightening torque (N.m) - NF E25-030 (8 grade nuts) |
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Friction coefficient |
M 5 |
M 6 |
M 8 |
0.20 |
6.4* |
11.1* |
27* |
0.15 |
5.5 |
9.5 |
23 |
0.10 |
4.3 |
7.5 |
18.2 |
*data shown in data sheets |
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