Metric Grades Steel Bolts
Metric steel bolts, screws and studs - proof and tensile strength
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| Class | Head Marking | Size Range (mm) |
Minimum Proof Strength (106 Pa) |
Minimum Tensile Strength (106 Pa) |
Material |
| 4.6 |
 |
M5 - M36 | 225 | 400 | Low or medium carbon steel |
| 4.8 |
 |
M1.6 - M16 | 310 | 420 | Low or medium carbon steel |
| 5.8 |
 |
M5 - M24 | 380 | 520 | Low or medium carbon steel |
| 8.8 |
 |
M16 - M36 | 600 | 830 | Medium carbon steel, Q & T |
| 9.8 |
 |
M1.6 - M16 | 650 | 900 | Medium carbon steel, Q & T |
| 10.9 |
 |
M5 - M36 | 830 | 1040 | Low carbon martensite steel, Q & T |
| 12.9 |
 |
M1.6 - M36 | 970 | 1220 | Alloy steel, Q & T |
- 1 Pa = 1 N/m2 = 1.4504x10-4 lb/in2 (psi)
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