ASTM Grades Steel Bolts
ASTM steel bolts - proof and tensile strength
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| ASTM Designation | Head Marking | Size Range (in) |
Minimum Proof Strength (103 psi) |
Minimum Tensile Strength (103 psi) |
Material |
| A307 |
 |
1/4 - 4 | Low carbon steel | ||
| A325 type 1 |
 |
1/2 - 1 1 1/8 - 1 1/2 |
85 74 |
120 105 |
Medium carbon steel, Q & T |
| A325 type 2 |
 |
1/2 - 1 1 1/8 - 1 1/2 |
85 74 |
120 105 |
Low carbon martensite steel, Q & T |
| A325 type 3 |
 |
1/2 - 1 1 1/8 - 1 1/2 |
85 74 |
120 105 |
Weathering steel, Q & T |
| A354 grade BC |
 |
Alloy steel, Q & T | |||
| A354 grade BD |
 |
1/4 - 4 | 120 | 150 | Alloy steel, Q & T |
| A449 |
 |
1/4 - 1 1 1/8 - 1 1/2 1 3/4 - 3 |
85 74 55 |
120 105 90 |
Medium carbon steel, Q & T |
| A490 type 1 |
 |
1/2 - 1 1/2 | 120 | 150 | Alloy steel, Q & T |
| A490 type 3 |
 |
Weathering steel, Q & T |
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2)
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