ASTM A307
A307 is a ASTM International specification for bolts and studs. A307 covers three grades of carbon steel bolts and studs in sizes 1/4" through 4".
ASTM A307
A307 is a ASTM International specification for bolts and studs.
A307 covers three grades of carbon steel bolts and studs in sizes 1/4" through 4".
A307 Grades
A307 Grade A
Bolts and studs having a minimum tensile strength of 60 ksi and intended for general applications.
A307 Grade B :
Bolts and studs having a tensile strength of 60 to 100 ksi and intended for flanged joints in piping systems with cast iron flanges.
A307 MECHANICAL PROPERTIES |
|||||
|---|---|---|---|---|---|
| Size | Tensile, ksi | Elong. % min | Hardness, Rockwell B | ||
| Length | min | max | |||
| A | 60 min | 18 | Less than 3" x dia. | 69 | 100 |
| 3" x dia. and longer | - | 100 | |||
| B | 60 - 100 | 18 | Less than 3" x dia. | 69 | 95 |
| 3" x dia. and longer | - | 95 | |||
A307 CHEMICAL PROPERTIES |
||
|---|---|---|
| Element | Grade A | Grade B |
| Carbon, max | 0.29% | 0.29% |
| Manganese, max | 1.2% | 1.2% |
| Phosphorus, max | 0.04% | 0.04% |
| Sulfur, max | 0.15% | 0.05% |
A307 RECOMMENDED HARDWARE |
||||
|---|---|---|---|---|
| Grade | Size | Nut | Washer | |
| Specification | Style | |||
| A | 1/4" - 1-1/2" | A563 Grade A | Hex | F844 |
| 1-5/8" - 4" | A563 Grade A | Heavy Hex | ||
| B | 1/4" - 4" | A563 Grade A | Heavy Hex | F844 |