ASTM A307
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. This is the standard bolt specification often manufactured using A36 round bar. There are two grades A, and B which denote tensile strength, configuration, and application.
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. |
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% |