Carbon steel bolts and studs ranging from ¼” to 4”.
Scope – This 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.
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. |
Mechanical Properties |
Grade | Markings | Tensile, ksi | Yield, min, ksi |
Elong %, min | Hardness |
| A | 307A | 60 min | — | 18 | B69-B100 | |
| B | 307B | 60 – 100 | — | 18 | B69-B95 |
Chemical
|
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 |
Recommended
|
Nuts Spec/Grade | Washers Spec/Grade | ||
| A307 Grades A | A307 Grade B | |||
| 1/4 – 1-1/2 | 1-5/8 – 4 | 1/4 – 4 | ||
| A563A Hex | A563A Heavy Hex | A563A Heavy Hex | F844 | |