完整六角螺栓尺寸表，涵盖M6-M48公制和1/4-2英寸英制尺寸。包括头部尺寸、螺纹长度和公差。
Why Accurate Bolt Dimensions Matter
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Metric Hex Bolt Dimensions (ISO 4014 / ISO 4017)
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| Size | Thread Pitch (mm) | Head AF (mm) | Head Height (mm) | Wrench Size (mm) |
|---|---|---|---|---|
| M6 | 1.0 | 10.0 | 4.0 | 10 |
| M8 | 1.25 | 13.0 | 5.3 | 13 |
| M10 | 1.5 | 16.0 | 6.4 | 16 |
| M12 | 1.75 | 18.0 | 7.5 | 18 |
| M16 | 2.0 | 24.0 | 10.0 | 24 |
| M20 | 2.5 | 30.0 | 12.5 | 30 |
| M24 | 3.0 | 36.0 | 15.0 | 36 |
| M30 | 3.5 | 46.0 | 18.7 | 46 |
| M36 | 4.0 | 55.0 | 22.5 | 55 |
| M42 | 4.5 | 65.0 | 26.0 | 65 |
| M48 | 5.0 | 75.0 | 30.0 | 75 |
Imperial Hex Bolt Dimensions (ASME B18.2.1)
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| Size (in) | TPI (UNC) | Head AF (in) | Head Height (in) | Wrench Size (in) |
|---|---|---|---|---|
| 1/4 | 20 | 7/16 | 11/64 | 7/16 |
| 5/16 | 18 | 1/2 | 7/32 | 1/2 |
| 3/8 | 16 | 9/16 | 1/4 | 9/16 |
| 1/2 | 13 | 3/4 | 11/32 | 3/4 |
| 5/8 | 11 | 15/16 | 27/64 | 15/16 |
| 3/4 | 10 | 1-1/8 | 1/2 | 1-1/8 |
| 7/8 | 9 | 1-5/16 | 37/64 | 1-5/16 |
| 1 | 8 | 1-1/2 | 43/64 | 1-1/2 |
| 1-1/4 | 7 | 1-7/8 | 27/32 | 1-7/8 |
| 1-1/2 | 6 | 2-1/4 | 31/32 | 2-1/4 |
| 2 | 4.5 | 3 | 1-5/16 | 3 |
Thread Length Rules for Partially Threaded Bolts
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Dimensional Tolerances You Should Know
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| Dimension | Tolerance (ISO) | Impact of Out-of-Spec |
|---|---|---|
| Head AF | 0 to +0.5mm | Wrench fit, torque accuracy |
| Body diameter | ISO g tolerance | Hole fit, shear capacity |
| Thread class | 6g (standard) | Nut engagement, preload |
| Bolt length | ±1.5mm (≤100mm) | Grip length, thread engagement |
| Head height | 0 to +0.6mm | Wrench clearance, bearing area |
Procurement Tips: Avoiding Dimension Mix-Ups
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Frequently Asked Questions
See frequently asked questions below.
What does M12×1.75 mean?
M12 is the nominal thread diameter (12mm). 1.75 is the thread pitch in millimeters (distance between adjacent threads). This is the standard coarse pitch for M12 bolts.
How do I measure bolt length correctly?
For hex bolts, measure from under the head to the end of the bolt. Do NOT include the head height. For countersunk bolts, measure total length including the head.
Can I use a metric wrench on an imperial bolt?
Not recommended. Close size matches (e.g., 13mm on 1/2" bolt) risk rounding the head. Always use the correct wrench size per the bolt standard.
What thread engagement depth do I need?
Minimum thread engagement = 1x bolt diameter for steel nuts, 1.5x diameter for aluminum, and 2x diameter for cast iron. Full engagement equals the nut height, which is typically 0.8x diameter.
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