SAE Grades Steel Bolts
SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength
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| 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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