# Hex bolts, inch: 1/4-20 to 3/4-10 (ASME B18.2.1)

> What wrench fits a 3/8-16 hex bolt?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: ASME B18.2.1 hex bolt / cap screw: width across flats F, head height H (nominal)
- Page: https://xemstudio.com/objects/hex-bolts-inch/ · JSON: https://xemstudio.com/api/geometry?object=hex-bolts-inch · Plain text: https://xemstudio.com/objects/hex-bolts-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.
- Length is under the head.

## Sizes

| thread | tpi | af_in | head_h_in | lengths_in |
|---|---|---|---|---|
| 1/4-20 | 20 | 0.4375 | 0.1562 | 0.5, 0.75, 1, 1.25, 1.5, 2, 2.5, 3 |
| 5/16-18 | 18 | 0.5 | 0.2031 | 0.75, 1, 1.25, 1.5, 2, 2.5, 3 |
| 3/8-16 | 16 | 0.5625 | 0.2344 | 0.75, 1, 1.25, 1.5, 2, 2.5, 3, 4 |
| 7/16-14 | 14 | 0.625 | 0.2812 | 1, 1.5, 2, 3 |
| 1/2-13 | 13 | 0.75 | 0.3438 | 1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6 |
| 5/8-11 | 11 | 0.9375 | 0.4219 | 1.5, 2, 3, 4, 5, 6 |
| 3/4-10 | 10 | 1.125 | 0.5 | 2, 3, 4, 5, 6 |

## Where the files are

- ASME: [ASME B18.2.1 Square, hex, heavy hex and askew head bolts and hex, heavy hex, hex flange, lobed head and lag screws (inch)](https://www.asme.org/codes-standards/find-codes-standards/b18-2-1-square-hex-heavy-hex-askew-head-bolts-hex-heavy-hex-hex-flange-lobed-head-lag-screws-inch-series) — standard — ASME; dimensions are facts (verify at link)

## Free STEP/STL (47 parts, CC BY 4.0, Xem Studio)

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

- hex-bolt-1-4-20x0.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x0.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x0.5in.stl) — 1/4-20 × 0.5 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x0.75in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x0.75in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x0.75in.stl) — 1/4-20 × 0.75 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x1in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1in.stl) — 1/4-20 × 1 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x1.25in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1.25in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1.25in.stl) — 1/4-20 × 1.25 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x1.5in.stl) — 1/4-20 × 1.5 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x2in.stl) — 1/4-20 × 2 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x2.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x2.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x2.5in.stl) — 1/4-20 × 2.5 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-1-4-20x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-4-20x3in.stl) — 1/4-20 × 3 in hex bolt: 0.4375 in AF, head 0.1562 in
- hex-bolt-5-16-18x0.75in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x0.75in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x0.75in.stl) — 5/16-18 × 0.75 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x1in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1in.stl) — 5/16-18 × 1 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x1.25in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1.25in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1.25in.stl) — 5/16-18 × 1.25 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x1.5in.stl) — 5/16-18 × 1.5 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x2in.stl) — 5/16-18 × 2 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x2.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x2.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x2.5in.stl) — 5/16-18 × 2.5 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-5-16-18x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-16-18x3in.stl) — 5/16-18 × 3 in hex bolt: 0.5 in AF, head 0.2031 in
- hex-bolt-3-8-16x0.75in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x0.75in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x0.75in.stl) — 3/8-16 × 0.75 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x1in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1in.stl) — 3/8-16 × 1 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x1.25in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1.25in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1.25in.stl) — 3/8-16 × 1.25 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x1.5in.stl) — 3/8-16 × 1.5 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x2in.stl) — 3/8-16 × 2 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x2.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x2.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x2.5in.stl) — 3/8-16 × 2.5 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x3in.stl) — 3/8-16 × 3 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-3-8-16x4in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x4in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-8-16x4in.stl) — 3/8-16 × 4 in hex bolt: 0.5625 in AF, head 0.2344 in
- hex-bolt-7-16-14x1in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x1in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x1in.stl) — 7/16-14 × 1 in hex bolt: 0.625 in AF, head 0.2812 in
- hex-bolt-7-16-14x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x1.5in.stl) — 7/16-14 × 1.5 in hex bolt: 0.625 in AF, head 0.2812 in
- hex-bolt-7-16-14x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x2in.stl) — 7/16-14 × 2 in hex bolt: 0.625 in AF, head 0.2812 in
- hex-bolt-7-16-14x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-7-16-14x3in.stl) — 7/16-14 × 3 in hex bolt: 0.625 in AF, head 0.2812 in
- hex-bolt-1-2-13x1in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1in.stl) — 1/2-13 × 1 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x1.25in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.25in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.25in.stl) — 1/2-13 × 1.25 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.5in.stl) — 1/2-13 × 1.5 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2in.stl) — 1/2-13 × 2 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x2.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2.5in.stl) — 1/2-13 × 2.5 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x3in.stl) — 1/2-13 × 3 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x4in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x4in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x4in.stl) — 1/2-13 × 4 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x5in.stl) — 1/2-13 × 5 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-1-2-13x6in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x6in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x6in.stl) — 1/2-13 × 6 in hex bolt: 0.75 in AF, head 0.3438 in
- hex-bolt-5-8-11x1.5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x1.5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x1.5in.stl) — 5/8-11 × 1.5 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-5-8-11x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x2in.stl) — 5/8-11 × 2 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-5-8-11x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x3in.stl) — 5/8-11 × 3 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-5-8-11x4in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x4in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x4in.stl) — 5/8-11 × 4 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-5-8-11x5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x5in.stl) — 5/8-11 × 5 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-5-8-11x6in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x6in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x6in.stl) — 5/8-11 × 6 in hex bolt: 0.9375 in AF, head 0.4219 in
- hex-bolt-3-4-10x2in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x2in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x2in.stl) — 3/4-10 × 2 in hex bolt: 1.125 in AF, head 0.5 in
- hex-bolt-3-4-10x3in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x3in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x3in.stl) — 3/4-10 × 3 in hex bolt: 1.125 in AF, head 0.5 in
- hex-bolt-3-4-10x4in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x4in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x4in.stl) — 3/4-10 × 4 in hex bolt: 1.125 in AF, head 0.5 in
- hex-bolt-3-4-10x5in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x5in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x5in.stl) — 3/4-10 × 5 in hex bolt: 1.125 in AF, head 0.5 in
- hex-bolt-3-4-10x6in: [STEP](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x6in.step) · [STL](https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x6in.stl) — 3/4-10 × 6 in hex bolt: 1.125 in AF, head 0.5 in

## Questions

**3/8-16 bolt head?**

9/16 in across flats, 15/64 in high.

## Fits with

- [Hex nuts, inch: #4-40 to 3/4-10 (ASME B18.2.2)](https://xemstudio.com/objects/hex-nuts-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/)