Sep 2025
Mechanical Properties of Nuts
| Property class |
Mechanical property |
|
Thread-Ø |
| > M8 to M10 |
> M10 to M16 |
> M16 to M39 |
| 04 |
Stress under proof load, Sp' [N/mm²] |
|
380 |
380 |
380 |
| Vickers hardness HV |
min. |
188 |
188 |
188 |
|
max. |
302 |
302 |
302 |
| 05 |
Stress under proof load, Sp' [N/mm²] |
|
500 |
500 |
500 |
| Vickers hardness HV |
min. |
272 |
272 |
272 |
|
max. |
353 |
353 |
353 |
| 4 |
Stress under proof load, Sp' [N/mm²] |
|
– |
– |
510 |
| Vickers hardness HV |
min. |
– |
– |
117 |
|
max. |
– |
– |
302 |
| 5 |
Stress under proof load, Sp' [N/mm²] |
|
590 |
610 |
630 |
| Vickers hardness HV |
min. |
130 |
130 |
146 |
|
max. |
302 |
302 |
302 |
| 6 |
Stress under proof load, Sp' [N/mm²] |
|
680 |
700 |
720 |
| Vickers hardness HV |
min. |
150 |
150 |
170 |
|
max. |
302 |
302 |
302 |
| 83) |
Stress under proof load, Sp' [N/mm²] |
|
870 |
880 |
920 |
| Vickers hardness HV |
min. |
200 |
200 |
233 |
|
max. |
302 |
302 |
302 |
| 9 |
Stress under proof load, Sp' [N/mm²] |
|
940 |
950 |
920 |
| Vickers hardness HV |
min. |
188 |
188 |
188 |
|
max. |
302 |
302 |
302 |
| 10 |
Stress under proof load, Sp' [N/mm²] |
|
1040 |
1050 |
1060 |
| Vickers hardness HV |
min. |
272 |
272 |
272 |
|
max. |
353 |
353 |
353 |
| 121) |
Stress under proof load, Sp' [N/mm²] |
|
1140 |
1170 |
– |
| Vickers hardness HV |
min. |
295 |
295 |
– |
|
max. |
353 |
353 |
– |
| 122) |
Stress under proof load, Sp' [N/mm²] |
|
1160 | 1190 |
1200 |
| Vickers hardness HV |
min. |
272 | 272 | 272 |
|
max. |
353 | 353 |
353 |
1) Nuts style 1 (ISO 4032) ˜ 0,9 d nuts
2) Nuts style 2 (ISO 4033) ˜ 1,0 d nuts
3) Class 8 = M16 only type 1 (not heat-treated)
> M16 type 1 (hardened and tempered) and type 2 (not heat-treated)