Basic informations about the mechanical properties of bolts according to standard ISO 898-1
| Property | Strength class | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.6 | 4.6 | 4.8 | 5.6 | 5.8 | 6.8 | 8.81) | 9.83) | 10.9 | 12.9 | ||||
| D<=16mm | D>16mm | ||||||||||||
| Tensile strength4), 5) Rm, MPa | jmen. | 300 | 400 | 500 | 600 | 800 | 800 | 900 | 1000 | 1200 | |||
| min. | 330 | 400 | 420 | 500 | 520 | 600 | 800 | 830 | 900 | 1040 | 1220 | ||
| Lower yield strength ReL2) | jmen. | 180 | 240 | 320 | 300 | 400 | 480 | - | - | - | - | - | |
| min. | 190 | 240 | 340 | 300 | 420 | 480 | - | - | - | - | - | ||
| Terms yield strength Rp0,2 | jmen. | - | - | - | - | - | - | 640 | 640 | 720 | 900 | 1080 | |
| min. | - | - | - | - | - | - | 640 | 660 | 720 | 940 | 1100 | ||
| Vickers HV F³98N | min. | 95 | 120 | 130 | 155 | 160 | 190 | 250 | 255 | 290 | 320 | 385 | |
| max. | 250 | 320 | 335 | 360 | 380 | 435 | |||||||
| Brinell BW F = 30 D2 | min. | 90 | 114 | 124 | 147 | 152 | 181 | 238 | 242 | 276 | 304 | 366 | |
| max. | 238 | 304 | 318 | 342 | 361 | 414 | |||||||
| Rockwell HR | min. | HRB | 52 | 67 | 79 | 89 | - | - | - | - | - | ||
| HRC | - | - | - | - | - | - | 22 | 23 | 30 | 32 | 39 | ||
| max. | HRB | 99,5 | 99,5 | 99,5 | 99,5 | - | - | - | - | - | |||
| HRC | - | - | - | - | - | - | 32 | 34 | 37 | 39 | 44 | ||
| Elongation A v % | min. | 25 | 22 | 14 | 20 | 10 | 8 | 12 | 12 | 10 | 9 | 8 | |
- For bolts of strength class 8.8 with a thread diameter d £ 16 mm is necessary to take intoaccount the ISO 898-2 (on the test load), otherwise there is danger of tearing down the nutwith excessive force. / For bolts for steel structures, the limit d ³ 12 mm /.
- In the event that there is no detectable lower yield strength ReL, allows to measurecontractual Rp0, 2
- For the strength class 9.8 applies to nominal diameter of thread.
- Minimum tensile strength is valid for bolts with nominal lengths of 2.5 d ³ I Minimum hardnessapplies to screws with a nominal length and <2.5 d and for such components can be tested by pulling (eg due to the shape of the head)
- For tests on whole bolts must be used forces according to relevant standards.
Limit of strength of bolts in tension depending on temperature
| Strength class according to DIN | Temperature | ||||
|---|---|---|---|---|---|
| +20°C | +100°C | +200°C | +250°C | +300°C | |
| Strength in tension v N/mm² | |||||
| 5,6 | 300 | 270 | 230 | 215 | 195 |
| 8,8 | 640 | 590 | 540 | 510 | 480 |
| 10,9 | 940 | 875 | 790 | 745 | 705 |
| 12,9 | 1100 | 1020 | 925 | 875 | 825 |