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US Bolts - Head and Wrench Sizes
Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt
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Head and wrench size US bolts are indicated in the table below:
| Bolt Diameter (in) | Head and Wrench Size (in) | |
| Hex Bolt Lag Bolt Square Bolt | Heavy Hex Bolt | |
| #6 | 1/4 | |
| #8 | 1/4 | |
| #10 | 5/16 | |
| #12 | 5/16 | |
| 1/4 | 7/16 or 3/8 | |
| 5/16 | 1/2 | |
| 3/8 | 9/16 | |
| 7/16 | 5/8 | |
| 1/2 | 3/4 | 7/8 |
| 9/16 | 13/16 | |
| 5/8 | 15/16 | 1-1/16 |
| 3/4 | 1-1/8 | 1-1/4 |
| 7/8 | 1-5/16 | 1-7/16 |
| 1 | 1-1/2 | 1-5/8 |
| 1-1/8 | 1-11/16 | 1-3/4 |
| 1-1/4 | 1-7/8 | 2 |
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Related Topics
- Miscellaneous - Miscellaneous engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more
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Related Documents
- Metric Bolts - Head and Wrench Sizes - ANSI/SO, DIN and JIS
- US Machine Screws - Machine Screw Diameters
- Wrench Conversion Chart - Comparison of US and metric wrenches
