# Socket head cap screws, inch: #10-24, #10-32, 5/16-18, 3/8-16, 1/2-13 (ASME B18.3)

> What are the dimensions of a 5/16-18 socket head 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/socket-head-cap-screws-inch/ · JSON: https://xemstudio.com/api/geometry?object=socket-head-cap-screws-inch · Plain text: https://xemstudio.com/objects/socket-head-cap-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 inch sizes above 1/4-20 (the #4 to 1/4-20 sizes are on the imperial machine screws page). 5/16-18 is the screw for 15-series (1.5 in) T-slot brackets, gussets and slide-in T-nuts; 1/4-20 for 10-series.
- Length is under the head. Threads are plain cylinders at the major diameter.

## Sizes

| size | major_mm | tpi | head_dia_mm | head_h_mm | hex_key_in | lengths_in |
|---|---|---|---|---|---|---|
| #10-24 | 4.826 | 24 | 7.92 | 4.83 | 5/32 | 0.375, 0.5, 0.625, 0.75, 1 |
| #10-32 | 4.826 | 32 | 7.92 | 4.83 | 5/32 | 0.375, 0.5, 0.75, 1 |
| 5/16-18 | 7.938 | 18 | 11.91 | 7.94 | 1/4 | 0.5, 0.625, 0.75, 1, 1.25, 1.5, 2 |
| 3/8-16 | 9.525 | 16 | 14.27 | 9.52 | 5/16 | 0.75, 1, 1.25, 1.5, 2 |
| 1/2-13 | 12.7 | 13 | 19.05 | 12.7 | 3/8 | 1, 1.5, 2, 2.5 |

## 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/socket-head-cap-screws-inch/index.json

- shcs-10-24x9.52mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x9.52mm.stl) — #10-24 × 0.375 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-24x12.70mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x12.70mm.stl) — #10-24 × 0.5 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-24x15.88mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x15.88mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x15.88mm.stl) — #10-24 × 0.625 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-24x19.05mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x19.05mm.stl) — #10-24 × 0.75 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-24x25.40mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-24x25.40mm.stl) — #10-24 × 1 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-32x9.52mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x9.52mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x9.52mm.stl) — #10-32 × 0.375 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-32x12.70mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x12.70mm.stl) — #10-32 × 0.5 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-32x19.05mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x19.05mm.stl) — #10-32 × 0.75 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-10-32x25.40mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-10-32x25.40mm.stl) — #10-32 × 1 in socket head cap screw: head Ø7.92 × 4.83, 5/32 in hex key
- shcs-5-16-18x12.70mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x12.70mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x12.70mm.stl) — 5/16-18 × 0.5 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x15.88mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x15.88mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x15.88mm.stl) — 5/16-18 × 0.625 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x19.05mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x19.05mm.stl) — 5/16-18 × 0.75 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x25.40mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x25.40mm.stl) — 5/16-18 × 1 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x31.75mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x31.75mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x31.75mm.stl) — 5/16-18 × 1.25 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x38.10mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x38.10mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x38.10mm.stl) — 5/16-18 × 1.5 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-5-16-18x50.80mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x50.80mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-5-16-18x50.80mm.stl) — 5/16-18 × 2 in socket head cap screw: head Ø11.91 × 7.94, 1/4 in hex key
- shcs-3-8-16x19.05mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x19.05mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x19.05mm.stl) — 3/8-16 × 0.75 in socket head cap screw: head Ø14.27 × 9.52, 5/16 in hex key
- shcs-3-8-16x25.40mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x25.40mm.stl) — 3/8-16 × 1 in socket head cap screw: head Ø14.27 × 9.52, 5/16 in hex key
- shcs-3-8-16x31.75mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x31.75mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x31.75mm.stl) — 3/8-16 × 1.25 in socket head cap screw: head Ø14.27 × 9.52, 5/16 in hex key
- shcs-3-8-16x38.10mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x38.10mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x38.10mm.stl) — 3/8-16 × 1.5 in socket head cap screw: head Ø14.27 × 9.52, 5/16 in hex key
- shcs-3-8-16x50.80mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x50.80mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-3-8-16x50.80mm.stl) — 3/8-16 × 2 in socket head cap screw: head Ø14.27 × 9.52, 5/16 in hex key
- shcs-1-2-13x25.40mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x25.40mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x25.40mm.stl) — 1/2-13 × 1 in socket head cap screw: head Ø19.05 × 12.70, 3/8 in hex key
- shcs-1-2-13x38.10mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x38.10mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x38.10mm.stl) — 1/2-13 × 1.5 in socket head cap screw: head Ø19.05 × 12.70, 3/8 in hex key
- shcs-1-2-13x50.80mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x50.80mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x50.80mm.stl) — 1/2-13 × 2 in socket head cap screw: head Ø19.05 × 12.70, 3/8 in hex key
- shcs-1-2-13x63.50mm: [STEP](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x63.50mm.step) · [STL](https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/shcs-1-2-13x63.50mm.stl) — 1/2-13 × 2.5 in socket head cap screw: head Ø19.05 × 12.70, 3/8 in hex key

## Questions

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

Ø0.469 in (11.91 mm) × 0.3125 in (7.94 mm) high, 1/4 in hex key.

## Fits with

- [Imperial machine screws: #4-40, #6-32, #8-32, 1/4-20](https://xemstudio.com/objects/imperial-machine-screws/)
- [Button head socket cap screws, inch: #4-40 to 1/2-13 (ASME B18.3)](https://xemstudio.com/objects/button-head-socket-screws-inch/)
- [1515 T-slot extrusion, 1.5 × 1.5 in (15-series inch)](https://xemstudio.com/objects/1515-t-slot-extrusion-inch/)
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)