US Nut Size Table
Thread Source carries a wide variety of fasteners including many different types of nuts. Check out our online reference tables showing hex nut dimensions and heavy hex nut dimensions and browse our catalog for specifications and information on specific types of nuts.
- Hex Nut
- A standard six sided nut.
- Machine Nut
- A hex nut in smaller sizes for machine screw diameters under 1/4.
- Jam Nut
- A thinner version of a hex nut.
- Nylock Nut
- A hex nut with a nylon ring to resist loosening.
| Size | Diam.* | Height | ||||
|---|---|---|---|---|---|---|
| Hex Nut | Machine Screw Nut | Hex Nut | Jam Nut | Nylock Nut | Machine Screw Nut | |
| 0 | – | 5/32 | – | – | – | 3/64 |
| 1 | – | 5/32 | – | – | – | 3/64 |
| 2 | – | 3/16 | – | – | 9/64 | 1/16 |
| 3 | – | 3/16 | – | – | 9/64 | 1/16 |
| 4 | – | 1/4 | – | – | 9/64 | 3/32 |
| 6 | – | 5/16 | – | – | 11/64 | 7/64 |
| 8 | – | 11/32 | – | – | 15/64 | 1/8 |
| 10 | – | 3/8 | – | – | 15/64 | 1/8 |
| 12 | – | 7/16 | – | – | 5/16 | 5/32 |
| 1/4 | 7/16 | 7/16 | 7/32 | 5/32 | 5/16 | 3/16 |
| 5/16 | 1/2 | 9/16 | 17/64 | 3/16 | 11/32 | 7/32 |
| 3/8 | 9/16 | 5/8 | 21/64 | 7/32 | 29/64 | 1/4 |
| 7/16 | 11/16 | – | 3/8 | 1/4 | 29/64 | – |
| 1/2 | 3/4 | – | 7/16 | 5/16 | 19/32 | – |
| 9/16 | 7/8 | – | 31/64 | 5/16 | 41/64 | – |
| 5/8 | 15/16 | – | 35/64 | 3/8 | 3/4 | – |
| 3/4 | 1-1/8 | – | 41/64 | 27/64 | 7/8 | – |
| 7/8 | 1-5/16 | – | 3/4 | 31/64 | 63/64 | – |
| 1 | 1-1/2 | – | 55/64 | 35/64 | 1-3/64 | – |
| * This is the diameter across the flats. It is also the size of wrench to use. | ||||||
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