# Slotted round nuts, DIN 546: M2–M20 outside diameter, height, slot width and depth

> What are the DIN 546 slotted round nut dimensions (outside diameter, height, slot width and depth) for M2 to M20?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it DIN 546 table (09/2010: d1, m, n, t), cross-checked against Westfield Fasteners' DIN 546 table and spot checks of Aspen, Würth and Fabory listings
- Page: https://xemstudio.com/objects/slotted-round-nuts-din-546/ · JSON: https://xemstudio.com/api/geometry?object=slotted-round-nuts-din-546 · Plain text: https://xemstudio.com/objects/slotted-round-nuts-din-546/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, outside diameter d1, height m, slot width n, slot depth t (min–max). The model uses the midpoint of t.
- M12 is omitted (sources disagree on t max); M1–M1.6 are not drawn. Thread drawn as a plain bore at the major diameter.

## 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 |
|---|---|---|---|---|
| thread (plain bore at the major Ø) | M2 to M20 | ISO metric screw or stud of the same size | designed | all |
| face slot | n wide × t deep (M6 2.5 × 2–2.4, M20 5 × 4.8–5.5) | flat screwdriver blade or slotted-ring wrench | designed | all |
| outside diameter | d1 (M6 11, M20 32) | counterbore for a flush fit | designed | all |

## Sizes

| thread | d1 | m | n | t min | t max |
|---|---|---|---|---|---|
| M2 | 4.5 | 2 | 1 | 0.8 | 1.0 |
| M2.5 | 5.5 | 2.2 | 1.2 | 0.9 | 1.1 |
| M3 | 6 | 2.5 | 1.2 | 1.0 | 1.2 |
| M3.5 | 7 | 3 | 1.4 | 1.0 | 1.4 |
| M4 | 8 | 3.5 | 1.4 | 1.2 | 1.6 |
| M5 | 9 | 4.2 | 2 | 1.5 | 1.9 |
| M6 | 11 | 5 | 2.5 | 2.0 | 2.4 |
| M8 | 14 | 6.5 | 3 | 2.5 | 3.0 |
| M10 | 18 | 8 | 3.5 | 3.2 | 3.7 |
| M14 | 24 | 11 | 4 | 3.8 | 4.3 |
| M16 | 26 | 12 | 4 | 3.8 | 4.3 |
| M18 | 29 | 13 | 4 | 4.8 | 5.5 |
| M20 | 32 | 14 | 5 | 4.8 | 5.5 |

## Where the files are

- fasten.it: [DIN 546 slotted round nuts (09/2010): dk, m, n, t](https://fasten.it/en/norms/norm/din_546) — web — Publisher's page; dimensions are facts
- Westfield Fasteners: [DIN 546 slotted round nuts: dimensions and tolerances](https://www.westfieldfasteners.co.uk/Standards/Nut-SlotRound546-M.html) — web — Publisher's page; dimensions are facts

## Free STEP/STL (13 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/index.json

- din546-m2: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m2.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m2.stl) — DIN 546 M2: Ø4.5 × 2, slot 1 wide × 0.9 deep (midpoint of 0.8–1.0)
- din546-m2.5: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m2.5.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m2.5.stl) — DIN 546 M2.5: Ø5.5 × 2.2, slot 1.2 wide × 1.0 deep (midpoint of 0.9–1.1)
- din546-m3: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m3.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m3.stl) — DIN 546 M3: Ø6 × 2.5, slot 1.2 wide × 1.1 deep (midpoint of 1.0–1.2)
- din546-m3.5: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m3.5.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m3.5.stl) — DIN 546 M3.5: Ø7 × 3, slot 1.4 wide × 1.2 deep (midpoint of 1.0–1.4)
- din546-m4: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m4.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m4.stl) — DIN 546 M4: Ø8 × 3.5, slot 1.4 wide × 1.4 deep (midpoint of 1.2–1.6)
- din546-m5: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m5.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m5.stl) — DIN 546 M5: Ø9 × 4.2, slot 2 wide × 1.7 deep (midpoint of 1.5–1.9)
- din546-m6: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m6.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m6.stl) — DIN 546 M6: Ø11 × 5, slot 2.5 wide × 2.2 deep (midpoint of 2.0–2.4)
- din546-m8: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m8.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m8.stl) — DIN 546 M8: Ø14 × 6.5, slot 3 wide × 2.75 deep (midpoint of 2.5–3.0)
- din546-m10: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m10.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m10.stl) — DIN 546 M10: Ø18 × 8, slot 3.5 wide × 3.45 deep (midpoint of 3.2–3.7)
- din546-m14: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m14.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m14.stl) — DIN 546 M14: Ø24 × 11, slot 4 wide × 4.05 deep (midpoint of 3.8–4.3)
- din546-m16: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m16.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m16.stl) — DIN 546 M16: Ø26 × 12, slot 4 wide × 4.05 deep (midpoint of 3.8–4.3)
- din546-m18: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m18.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m18.stl) — DIN 546 M18: Ø29 × 13, slot 4 wide × 5.15 deep (midpoint of 4.8–5.5)
- din546-m20: [STEP](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m20.step) · [STL](https://xemstudio.com/files/hardware/slotted-round-nuts-din-546/din546-m20.stl) — DIN 546 M20: Ø32 × 14, slot 5 wide × 5.15 deep (midpoint of 4.8–5.5)

## Questions

**What size is an M6 slotted round nut?**

DIN 546 M6: 11 mm outside diameter, 5 mm tall, 2.5 mm slot about 2 to 2.4 mm deep.

**What tightens a DIN 546 nut?**

A flat screwdriver blade or a slotted-ring wrench (ISO 1703) in the face slot; the round body sits flush in a counterbore.

## Fits with

- [Slotted and castle nuts, DIN 935-1, M4–M36: across flats, height, slot width, collar, cotter pin size + envelope models](https://xemstudio.com/objects/slotted-castle-nuts-din-935/)
- [Knurled nuts, DIN 466 (high) and DIN 467 (low): M1–M10 knurl diameter, collar, height](https://xemstudio.com/objects/knurled-nuts-din-466-467/)
- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)
- [Two-hole nuts, DIN 547: M3–M10 outside diameter, height, pin-hole size, spacing and depth](https://xemstudio.com/objects/two-hole-nuts-din-547/)