The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar. There are three grades A, B, and C* which denote tensile strength, configuration, and application. Refer to the Mechanical Properties Chart for the subtle strength differences within each grade.
A307 Grades
| 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* |
 |
Nonheaded 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 *As of August 2007, grade C has been replaced by specification F1554 grade 36.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 will continue to supply grade C, if required by the project. |
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 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 Recommended Hardware
| Nuts |
Washers |
| A307 Grades A & C* |
A307 Grade B |
| 1/4 - 1-1/2 |
1-5/8 - 4 |
1/4 - 4 |
| A563A Hex |
A563A Heavy Hex |
A563A Heavy Hex |
Unspecified |
