Grade Head Styles
| Specification | Grade | Specified Head Configuration |
|---|---|---|
| ASTM A307 | A | Standard Hex |
| B | Heavy Hex | |
| ASTM F3125 | A325 | Heavy Hex Structural |
| A490 | ||
| ASTM A449 | Standard Hex | |
| ASTM A193 | B7 | Heavy Hex |
| B8 | ||
| B8M | ||
| ASTM A320 | L7 | Heavy Hex |
| B8 | ||
| B8M | ||
| ASTM A354 | BC | Standard Hex |
| BD | ||
| ASTM F1554 | Grade 36 | Unspecified |
| Grade 55 | ||
| Grade 105 | ||
| ASTM F593 | Alloy Group 1 | Standard Hex |
| Alloy Group 2 | ||
| SAE J429 | Grade 2 | Standard Hex |
| Grade 5 | ||
| Grade 8 | ||
| Head styles are unless otherwise specified. | ||