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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 |
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M5 - M36 | 225 | 400 | Low or medium carbon steel |
| 4.8 |
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M1.6 - M16 | 310 | 420 | Low or medium carbon steel |
| 5.8 |
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M5 - M24 | 380 | 520 | Low or medium carbon steel |
| 8.8 |
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M16 - M36 | 600 | 830 | Medium carbon steel, Q & T |
| 9.8 |
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M1.6 - M16 | 650 | 900 | Medium carbon steel, Q & T |
| 10.9 |
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M5 - M36 | 830 | 1040 | Low carbon martensite steel, Q & T |
| 12.9 |
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M1.6 - M36 | 970 | 1220 | Alloy steel, Q & T |
- 1 Pa = 1 N/m2 = 1.4504x10-4 lb/in2 (psi)
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Related Topics
- Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects
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Related Documents
- ASTM Grades Steel Bolts - ASTM steel bolts - proof and tensile strength
- SAE Grades Steel Bolts - SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength
- Stress in Bolts - Calculating the stressed area in UN and UNR bolts












