Hex head bolts are fundamental fasteners in mechanical engineering and construction, characterized by their six-sided (hexagonal) head design or 6-point (6P) hex head that allows for efficient torque application using standard wrenches or sockets.
The following tables provide sizes for both metric and imperial hex head bolts. These reference guides include key dimensions such as:
- Thread Size
- Head size (width across flats)
- Head Depth
By referencing these tables, you’ll be able to:
- Identify the correct tools needed for installation and removal
- Understand the interchangeability (or lack thereof) between metric and imperial fasteners
- Make informed decisions about suitable replacements when exact matches aren’t available
Metric Hex Head Bolts
| Thread Size | Across Flats | Head Depth |
|---|---|---|
| M3 | 5.50 | 2.00 |
| M4 | 7.00 | 2.80 |
| M5 | 8.00 | 3.50 |
| M6 | 10.00 | 4.00 |
| M8 | 13.00 | 5.30 |
| M10 | 16.00 | 6.40 |
| M12 | 18.00 | 7.50 |
| M14 | 22.00 | 8.80 |
| M16 | 24.00 | 10.00 |
| M18 | 27.00 | 11.50 |
| M20 | 30.00 | 12.50 |
| M22 | 32.00 | 14.00 |
| M24 | 36.00 | 15.00 |
Imperial Hex Head Bolts
| Thread Size | Across Flats (inches) | Across Flats (mm) | Head Depth |
|---|---|---|---|
| #6 | 1/4 | 6.35 | 2.36 |
| #8 | 5/16 | 7.94 | 2.79 |
| #10 | 3/8 | 9.53 | 3.05 |
| 1/4 | 7/16 | 11.11 | 4.37 |
| 5/16 | 1/2 | 12.70 | 5.56 |
| 3/8 | 9/16 | 14.29 | 6.35 |
| 7/16 | 5/8 | 15.88 | 7.54 |
| 1/2 | 3/4 | 19.05 | 8.73 |
| 5/8 | 15/16 | 23.81 | 10.72 |
| 3/4 | 1 1/8 | 28.58 | 12.70 |
| 7/8 | 1 5/16 | 33.34 | 14.68 |
| 1 | 1 1/2 | 38.10 | 17.07 |
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