# Button head socket cap screws, inch: #4-40 to 1/2-13 (ASME B18.3)

> What are the dimensions of a 5/16-18 button head socket cap screw?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: ASME B18.3 inch socket screws: head diameter A (max), head height H, hex socket J; thread drawn as a plain cylinder at the major diameter
- Page: https://xemstudio.com/objects/button-head-socket-screws-inch/ · JSON: https://xemstudio.com/api/geometry?object=button-head-socket-screws-inch · Plain text: https://xemstudio.com/objects/button-head-socket-screws-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

- The low-profile screw T-slot framing uses on brackets and panels: 1/4-20 for 10-series, 5/16-18 for 15-series. Length is under the head; the head is a dome to height H over diameter A.

## Sizes

| size | major_mm | tpi | head_dia_mm | head_h_mm | hex_key_in | lengths_in |
|---|---|---|---|---|---|---|
| #4-40 | 2.845 | 40 | 5.41 | 1.5 | 1/16 | 0.25, 0.375, 0.5 |
| #6-32 | 3.505 | 32 | 6.65 | 1.83 | 5/64 | 0.25, 0.375, 0.5 |
| #8-32 | 4.166 | 32 | 7.92 | 2.11 | 3/32 | 0.375, 0.5 |
| #10-24 | 4.826 | 24 | 9.17 | 2.54 | 1/8 | 0.375, 0.5, 0.75 |
| #10-32 | 4.826 | 32 | 9.17 | 2.54 | 1/8 | 0.375, 0.5 |
| 1/4-20 | 6.35 | 20 | 11.1 | 3.35 | 5/32 | 0.375, 0.5, 0.625, 0.75, 1 |
| 5/16-18 | 7.938 | 18 | 13.89 | 4.22 | 3/16 | 0.5, 0.625, 0.75, 1 |
| 3/8-16 | 9.525 | 16 | 16.66 | 5.05 | 7/32 | 0.75, 1 |
| 1/2-13 | 12.7 | 13 | 22.22 | 6.73 | 5/16 | 1 |

## Where the files are

- ASME: [B18.3 Socket cap, shoulder, set screws, hex and spline keys (inch series): head diameter, height, hex socket](https://www.asme.org/codes-standards/find-codes-standards/b18-3-socket-cap-shoulder-set-screws-hex-spline-keys-inch-series) — standard — ASME; dimensions are facts (verify at link)

## Free STEP/STL (25 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/button-head-socket-screws-inch/index.json

- bhcs-4-40x6.35mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x6.35mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x6.35mm.stl) — #4-40 × 0.25 in button head socket cap screw: head Ø5.41 × 1.50, 1/16 in hex key
- bhcs-4-40x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x9.52mm.stl) — #4-40 × 0.375 in button head socket cap screw: head Ø5.41 × 1.50, 1/16 in hex key
- bhcs-4-40x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-4-40x12.70mm.stl) — #4-40 × 0.5 in button head socket cap screw: head Ø5.41 × 1.50, 1/16 in hex key
- bhcs-6-32x6.35mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x6.35mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x6.35mm.stl) — #6-32 × 0.25 in button head socket cap screw: head Ø6.65 × 1.83, 5/64 in hex key
- bhcs-6-32x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x9.52mm.stl) — #6-32 × 0.375 in button head socket cap screw: head Ø6.65 × 1.83, 5/64 in hex key
- bhcs-6-32x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-6-32x12.70mm.stl) — #6-32 × 0.5 in button head socket cap screw: head Ø6.65 × 1.83, 5/64 in hex key
- bhcs-8-32x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-8-32x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-8-32x9.52mm.stl) — #8-32 × 0.375 in button head socket cap screw: head Ø7.92 × 2.11, 3/32 in hex key
- bhcs-8-32x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-8-32x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-8-32x12.70mm.stl) — #8-32 × 0.5 in button head socket cap screw: head Ø7.92 × 2.11, 3/32 in hex key
- bhcs-10-24x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x9.52mm.stl) — #10-24 × 0.375 in button head socket cap screw: head Ø9.17 × 2.54, 1/8 in hex key
- bhcs-10-24x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x12.70mm.stl) — #10-24 × 0.5 in button head socket cap screw: head Ø9.17 × 2.54, 1/8 in hex key
- bhcs-10-24x19.05mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-24x19.05mm.stl) — #10-24 × 0.75 in button head socket cap screw: head Ø9.17 × 2.54, 1/8 in hex key
- bhcs-10-32x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-32x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-32x9.52mm.stl) — #10-32 × 0.375 in button head socket cap screw: head Ø9.17 × 2.54, 1/8 in hex key
- bhcs-10-32x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-32x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-10-32x12.70mm.stl) — #10-32 × 0.5 in button head socket cap screw: head Ø9.17 × 2.54, 1/8 in hex key
- bhcs-1-4-20x9.52mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x9.52mm.stl) — 1/4-20 × 0.375 in button head socket cap screw: head Ø11.10 × 3.35, 5/32 in hex key
- bhcs-1-4-20x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x12.70mm.stl) — 1/4-20 × 0.5 in button head socket cap screw: head Ø11.10 × 3.35, 5/32 in hex key
- bhcs-1-4-20x15.88mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x15.88mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x15.88mm.stl) — 1/4-20 × 0.625 in button head socket cap screw: head Ø11.10 × 3.35, 5/32 in hex key
- bhcs-1-4-20x19.05mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x19.05mm.stl) — 1/4-20 × 0.75 in button head socket cap screw: head Ø11.10 × 3.35, 5/32 in hex key
- bhcs-1-4-20x25.40mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-4-20x25.40mm.stl) — 1/4-20 × 1 in button head socket cap screw: head Ø11.10 × 3.35, 5/32 in hex key
- bhcs-5-16-18x12.70mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x12.70mm.stl) — 5/16-18 × 0.5 in button head socket cap screw: head Ø13.89 × 4.22, 3/16 in hex key
- bhcs-5-16-18x15.88mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x15.88mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x15.88mm.stl) — 5/16-18 × 0.625 in button head socket cap screw: head Ø13.89 × 4.22, 3/16 in hex key
- bhcs-5-16-18x19.05mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x19.05mm.stl) — 5/16-18 × 0.75 in button head socket cap screw: head Ø13.89 × 4.22, 3/16 in hex key
- bhcs-5-16-18x25.40mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-5-16-18x25.40mm.stl) — 5/16-18 × 1 in button head socket cap screw: head Ø13.89 × 4.22, 3/16 in hex key
- bhcs-3-8-16x19.05mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-3-8-16x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-3-8-16x19.05mm.stl) — 3/8-16 × 0.75 in button head socket cap screw: head Ø16.66 × 5.05, 7/32 in hex key
- bhcs-3-8-16x25.40mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-3-8-16x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-3-8-16x25.40mm.stl) — 3/8-16 × 1 in button head socket cap screw: head Ø16.66 × 5.05, 7/32 in hex key
- bhcs-1-2-13x25.40mm: [STEP](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-2-13x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/button-head-socket-screws-inch/bhcs-1-2-13x25.40mm.stl) — 1/2-13 × 1 in button head socket cap screw: head Ø22.22 × 6.73, 5/16 in hex key

## Questions

**What is the head of a 5/16-18 BHCS?**

Ø0.547 in (13.89 mm) × 0.166 in (4.22 mm) high, 3/16 in hex key.

## Fits with

- [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/)
- [Imperial machine screws: #4-40, #6-32, #8-32, 1/4-20](https://xemstudio.com/objects/imperial-machine-screws/)
- [1515 T-slot extrusion, 1.5 × 1.5 in (15-series inch)](https://xemstudio.com/objects/1515-t-slot-extrusion-inch/)
- [Joining plates, 2 × 3 holes, for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-joining-plates/)