# Hex nuts, inch: #4-40 to 3/4-10 (ASME B18.2.2)

> What size is a 5/16-18 nut?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: ASME B18.2.2 finished hex nuts and machine screw nuts: width across flats F, thickness H
- Page: https://xemstudio.com/objects/hex-nuts-inch/ · JSON: https://xemstudio.com/api/geometry?object=hex-nuts-inch · Plain text: https://xemstudio.com/objects/hex-nuts-inch/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Threads are plain cylinders at the major diameter, as every thread on this site. The bore is the major diameter.

## Sizes

| thread | af_in | thickness_in |
|---|---|---|
| 1/4-20 | 0.4375 | 0.2188 |
| 5/16-18 | 0.5 | 0.2656 |
| 3/8-16 | 0.5625 | 0.3281 |
| 7/16-14 | 0.6875 | 0.375 |
| 1/2-13 | 0.75 | 0.4375 |
| 5/8-11 | 0.9375 | 0.5469 |
| 3/4-10 | 1.125 | 0.6406 |
| #4-40 | 0.25 | 0.0938 |
| #6-32 | 0.3125 | 0.1094 |
| #8-32 | 0.3438 | 0.125 |
| #10-24 | 0.375 | 0.125 |
| #10-32 | 0.375 | 0.125 |

## Where the files are

- ASME: [ASME B18.2.2 Nuts for general applications (inch)](https://www.asme.org/codes-standards/find-codes-standards/b18-2-2-nuts-for-general-applications-machine-screw-nuts-hex-square-hex-flange-coupling-nuts-(inch-series)) — standard — ASME; dimensions are facts (verify at link)

## Free STEP/STL (12 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/hex-nuts-inch/index.json

- nut-1-4-20: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-1-4-20.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-1-4-20.stl) — 1/4-20 finished hex nut: 0.4375 in AF × 0.2188 in
- nut-5-16-18: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-5-16-18.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-5-16-18.stl) — 5/16-18 finished hex nut: 0.5 in AF × 0.2656 in
- nut-3-8-16: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-3-8-16.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-3-8-16.stl) — 3/8-16 finished hex nut: 0.5625 in AF × 0.3281 in
- nut-7-16-14: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-7-16-14.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-7-16-14.stl) — 7/16-14 finished hex nut: 0.6875 in AF × 0.375 in
- nut-1-2-13: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-1-2-13.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-1-2-13.stl) — 1/2-13 finished hex nut: 0.75 in AF × 0.4375 in
- nut-5-8-11: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-5-8-11.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-5-8-11.stl) — 5/8-11 finished hex nut: 0.9375 in AF × 0.5469 in
- nut-3-4-10: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-3-4-10.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-3-4-10.stl) — 3/4-10 finished hex nut: 1.125 in AF × 0.6406 in
- nut-4-40: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-4-40.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-4-40.stl) — #4-40 machine screw nut: 0.25 in AF × 0.09375 in
- nut-6-32: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-6-32.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-6-32.stl) — #6-32 machine screw nut: 0.3125 in AF × 0.1094 in
- nut-8-32: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-8-32.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-8-32.stl) — #8-32 machine screw nut: 0.3438 in AF × 0.125 in
- nut-10-24: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-10-24.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-10-24.stl) — #10-24 machine screw nut: 0.375 in AF × 0.125 in
- nut-10-32: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-10-32.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch/nut-10-32.stl) — #10-32 machine screw nut: 0.375 in AF × 0.125 in

## Questions

**5/16-18 nut?**

1/2 in AF, 17/64 in thick.

## Fits with

- [Hex bolts, inch: 1/4-20 to 3/4-10 (ASME B18.2.1)](https://xemstudio.com/objects/hex-bolts-inch/)
- [Flat washers, inch: SAE and USS, 1/4 to 3/4 in (ASME B18.21.1 Type A)](https://xemstudio.com/objects/flat-washers-inch/)
- [Socket head cap screws, inch: #10-24, #10-32, 5/16-18, 3/8-16, 1/2-13 (ASME B18.3)](https://xemstudio.com/objects/socket-head-cap-screws-inch/)
- [Button head socket cap screws, inch: #4-40 to 1/2-13 (ASME B18.3)](https://xemstudio.com/objects/button-head-socket-screws-inch/)
- [Imperial machine screws: #4-40, #6-32, #8-32, 1/4-20](https://xemstudio.com/objects/imperial-machine-screws/)