Mechanical Properties of Bolts, Screws and Studs
| Mechanical Properties |
8.8 <M 16 |
8.8 > M 16 |
9.8 |
10.9 |
12.9 |
| Tensile Strength, Rm, N/mm2 |
Nom |
800 |
800 |
900 |
1000 |
1200 |
| Min |
800 |
830 |
900 |
1040 |
1220 |
| Vickers hardness, HV, F>98 N |
Min |
250 |
255 |
290 |
320 |
385 |
| Max |
320 |
335 |
360 |
380 |
435 |
| Brinell hardness, HB, F=30D2 |
Min |
238 |
242 |
276 |
304 |
366 |
| Max |
304 |
318 |
342 |
361 |
414 |
| Rockwell hardness, HRC |
Min |
22 |
23 |
28 |
32 |
39 |
| Max |
32 |
34 |
37 |
39 |
44 |
| Surface hardness, HV 0.3 |
Max |
320 |
356 |
380 |
402 |
454 |
| Proof Stress, Rp 0.2, N/mm2 |
Nom |
640 |
640 |
720 |
900 |
1080 |
| Min |
640 |
660 |
720 |
940 |
1100 |
| Stress under proof load, Sp, Sp/Rp |
0.2 |
0.91 |
0.91 |
0.90 |
0.88 |
0.88 |
| N/mm2 |
580 |
600 |
650 |
830 |
970 |
| Elongation after fracture, A |
Min |
12 |
12 |
10 |
9 |
8 |
| Impact Strength, J |
Min |
30 |
30 |
25 |
20 |
15 |
| Head Soundness |
|
No Fracture |
| Minimum height of non-decarburized thread zone, E |
|
1/2 H1 |
2/3 H1 |
3/4 H1 |
| Maximum depth of complete mm decarburization, G |
|
0.015 |
