# T-slot nuts, DIN 508: M4–M22 for 5–24 mm T-slots, neck width, base, height

> What are the DIN 508 T-slot nut dimensions for a 10, 12, 14 or 18 mm T-slot?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: OPAC's DIN 508 table (slot, a, e, h, k), cross-checked against Halder's DIN 508 catalogue (EH 23010) and fasten.it's DIN 508 table (06/2002)
- Page: https://xemstudio.com/objects/t-slot-nuts-din-508/ · JSON: https://xemstudio.com/api/geometry?object=t-slot-nuts-din-508 · Plain text: https://xemstudio.com/objects/t-slot-nuts-din-508/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Columns: thread d, T-slot size (to DIN 650), neck width a (slot minus 0.4), base e (length and width), total height h, base height k. Halder lists the same a, e, h, k for every shared size (e.g. 14 mm slot: a 13.6, e 22, h 16, k 8).
- Files: square base plus a full-length neck, thread as a plain bore at the major diameter. Larger sizes (M24, M30) are in the standard but not drawn here.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| neck | a = slot − 0.4: 4.6 (5 mm slot) to 23.6 (24 mm slot) | T-slot width to DIN 650 (5 to 24 mm) | designed | all |
| base | e × e × k: 9 × 9 × 3 (M4) to 40 × 40 × 16 (M22) | T-slot undercut below the slot | designed | all |
| thread (plain bore at the major Ø) | d: M4 to M22 | clamp stud or screw | designed | all |

## Sizes

| thread | slot | a | e | h | k |
|---|---|---|---|---|---|
| M4 | 5 | 4.6 | 9 | 6.5 | 3 |
| M5 | 6 | 5.6 | 10 | 8 | 4 |
| M6 | 8 | 7.6 | 13 | 10 | 6 |
| M8 | 10 | 9.6 | 15 | 12 | 6 |
| M10 | 12 | 11.6 | 18 | 14 | 7 |
| M12 | 14 | 13.6 | 22 | 16 | 8 |
| M14 | 16 | 15.6 | 25 | 18 | 9 |
| M16 | 18 | 17.6 | 28 | 20 | 10 |
| M18 | 20 | 19.6 | 32 | 24 | 12 |
| M20 | 22 | 21.6 | 35 | 28 | 14 |
| M22 | 24 | 23.6 | 40 | 32 | 16 |

## Where the files are

- OPAC: [DIN 508 nuts for T-slots: D, A, E, H, H1](https://www.opac.net/en/producto-4-din-508) — web — Publisher's page; dimensions are facts
- Halder (via MISUMI): [Nuts for T-slots DIN 508, EH 23010: d, a, e, h, k](https://tw.c.misumi-ec.com/book/RHL1_ENG_13_02_24/pdf/0657.pdf) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [T-slot nuts, DIN 508 metric listings](https://www.mcmaster.com/tooling-component-t-slot-nuts) — web — Publisher's page; dimensions are facts

## Free STEP/STL (11 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/t-slot-nuts-din-508/index.json

- din508-5mm-m4: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-5mm-m4.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-5mm-m4.stl) — DIN 508 for 5 mm slot, M4: neck 4.6, base 9×9, h 6.5, k 3
- din508-6mm-m5: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-6mm-m5.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-6mm-m5.stl) — DIN 508 for 6 mm slot, M5: neck 5.6, base 10×10, h 8, k 4
- din508-8mm-m6: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-8mm-m6.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-8mm-m6.stl) — DIN 508 for 8 mm slot, M6: neck 7.6, base 13×13, h 10, k 6
- din508-10mm-m8: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-10mm-m8.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-10mm-m8.stl) — DIN 508 for 10 mm slot, M8: neck 9.6, base 15×15, h 12, k 6
- din508-12mm-m10: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-12mm-m10.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-12mm-m10.stl) — DIN 508 for 12 mm slot, M10: neck 11.6, base 18×18, h 14, k 7
- din508-14mm-m12: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-14mm-m12.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-14mm-m12.stl) — DIN 508 for 14 mm slot, M12: neck 13.6, base 22×22, h 16, k 8
- din508-16mm-m14: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-16mm-m14.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-16mm-m14.stl) — DIN 508 for 16 mm slot, M14: neck 15.6, base 25×25, h 18, k 9
- din508-18mm-m16: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-18mm-m16.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-18mm-m16.stl) — DIN 508 for 18 mm slot, M16: neck 17.6, base 28×28, h 20, k 10
- din508-20mm-m18: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-20mm-m18.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-20mm-m18.stl) — DIN 508 for 20 mm slot, M18: neck 19.6, base 32×32, h 24, k 12
- din508-22mm-m20: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-22mm-m20.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-22mm-m20.stl) — DIN 508 for 22 mm slot, M20: neck 21.6, base 35×35, h 28, k 14
- din508-24mm-m22: [STEP](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-24mm-m22.step) · [STL](https://xemstudio.com/files/hardware/t-slot-nuts-din-508/din508-24mm-m22.stl) — DIN 508 for 24 mm slot, M22: neck 23.6, base 40×40, h 32, k 16

## Questions

**What are the dimensions of a T-slot nut for a 14 mm slot?**

DIN 508 M12 for a 14 mm slot: 13.6 mm neck, 22 × 22 mm base, 16 mm overall, 8 mm base height.

**Why is the neck 0.4 mm narrower than the slot?**

DIN 508 sizes the neck a at slot − 0.4 so it slides in a DIN 650 T-slot.

## Fits with

- [Snap-in slot covers for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion (100 mm)](https://xemstudio.com/objects/t-slot-covers/)
- [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/)
- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)