Mechanical and physical properties of bolts, screws and studs
The bolts, screws and studs of the specified property classes shall, at ambient temperature 3), meet all the applicable mechanical and physical properties according to following Table , regardless of which tests are performed during manufacturing or final inspection.
| Mechanical or physical property | Property class | ||||||||
| 4.6 | 4.8 | 5.6 | 6.8 | 8.8 (d≤16mm) | 8.8(d＞16mm) | 10.9 | 12.9 | ||
| Tensile strength, Rm, MPa | nom. | 400 | 400 | 500 | 600 | 800 | 800 | 1000 | 1200 |
| min. | 400 | 420 | 500 | 600 | 800 | 830 | 1040 | 1220 | |
| Lower yield strength, ReL d, MPa | nom. | 240 | - | 300 | - | - | - | - | - |
| min. | 240 | - | 300 | - | - | - | - | - | |
| Stress at 0,2 % nonproportional elongation, R p0,2, MPa | nom. | - | - | - | - | 640 | 640 | 900 | 1080 |
| min. | - | - | - | - | 640 | 660 | 940 | 1100 | |
| Percentage elongation after fracture for machined test pieces, A, % | min. | 22 | - | 20 | - | 12 | 12 | 10 | 8 |
| Percentage reduction of area after fracture for machined test pieces, Z, % | min. | - | 52 | 48 | 44 | ||||
| Vickers hardness, HV F W 98 N | min. | 120 | 130 | 155 | 190 | 250 | 255 | 320 | 385 |
| max. | 220 | 320 | 335 | 380 | 435 | ||||
| Rockwell hardness, HRC | min. | - | - | - | - | 22 | 23 | 32 | 39 |
| max. | - | - | - | - | 32 | 34 | 39 | 44 | |