Steel Bolts - SAE Grades
| SAE Grade | Head Marking | Size Range (in) | Minimum Proof Strength (103 psi) | Minimum Tensile Strength (103 psi) | Material |
|---|---|---|---|---|---|
| 1 | 1/4 - 1 1/2 | Low - medium carbon steel | |||
| 2 | 1/4 - 3/4 7/8 - 1 1/2 | 55 33 | 74 60 | Low - medium carbon steel | |
| 5 | 1/4 - 1 1 1/8 - 1 1/2 | 85 74 | 120 105 | Medium carbon steel, Q & T | |
| 5.2 | 1/4 - 1 | 85 | 120 | Low carbon martensite steel, Q & T | |
| 7 | 1/4 - 1 1/2 | 105 | 133 | Medium carbon alloy steel, Q & T | |
| 8 | 1/4 - 1 1/2 | 120 | 150 | Medium carbon alloy steel, Q & T | |
| 8.2 | 1/4 - 1 | 120 | 150 | Low carbon martensite steel, Q & T |
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2)
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