ASTM A307
This specification covers the chemical and mechanical requirements of two grades of carbon steel bolts and studs in sizes ½” in. through 4 in. The fasteners are designated by “Grade” denoting tensile strength and intended use, as follows:
| A |  |
Headed bolts, threaded rods and bent bolts intended for general applications. |
|---|---|---|
| B |  |
Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges. |
| C* |  |
Anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. *As of August 2007, grade C has been replaced by specification F1554 grade 36. We can supply grade C, if required by the project. |
A307 CHEMICAL PROPERTIES
| Element | Grade A | Grade B |
|---|---|---|
| Carbon, Max | 0.29% | 0.29% |
| Manganese, Max | 1.20% | 1.20% |
| Phosphorus, Max | 0.04% | 0.04% |
| Sulfur, Max | 0.15% | 0.05% |
A307 MECHANICAL PROPERTIES
| Grade | Tensile, Ksi | Yield, Min, Ksi | Elong %, Min |
|---|---|---|---|
| A | 60 Min | – – | 18 |
| B | 60 – 100 | – – | 18 |
| C* | 58 – 80 | 36 | 23 |
A307 RECOMMENDED ASSEMBLY COMBINATION
| Nuts | Washers |
|---|---|
| ASTM A563 Gr. A & B | F844/F436 |
| ½” – 4″ | ½” – 4″ |