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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? · 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
Also called: din 546 dimensions, slotted round nut m6, m4 round nut with slot, screwdriver slot nut m8 diameter, din 546 m10 height
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. Mating features
- sizes
- 13 in table
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.
Slotted round nuts, DIN 546: M2–M20 outside diameter, height, slot… size chart
| 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 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits 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 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| fasten.it | DIN 546 slotted round nuts (09/2010): dk, m, n, t | web | Publisher's page; dimensions are facts |
| Westfield Fasteners | DIN 546 slotted round nuts: dimensions and tolerances | web | Publisher's page; dimensions are facts |
Free files
★ Free files 13 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| din546-m2 | DIN 546 M2: Ø4.5 × 2, slot 1 wide × 0.9 deep (midpoint of 0.8–1.0) | STEP · STL |
| din546-m2.5 | DIN 546 M2.5: Ø5.5 × 2.2, slot 1.2 wide × 1.0 deep (midpoint of 0.9–1.1) | STEP · STL |
| din546-m3 | DIN 546 M3: Ø6 × 2.5, slot 1.2 wide × 1.1 deep (midpoint of 1.0–1.2) | STEP · STL |
| din546-m3.5 | DIN 546 M3.5: Ø7 × 3, slot 1.4 wide × 1.2 deep (midpoint of 1.0–1.4) | STEP · STL |
| din546-m4 | DIN 546 M4: Ø8 × 3.5, slot 1.4 wide × 1.4 deep (midpoint of 1.2–1.6) | STEP · STL |
| din546-m5 | DIN 546 M5: Ø9 × 4.2, slot 2 wide × 1.7 deep (midpoint of 1.5–1.9) | STEP · STL |
| din546-m6 | DIN 546 M6: Ø11 × 5, slot 2.5 wide × 2.2 deep (midpoint of 2.0–2.4) | STEP · STL |
| din546-m8 | DIN 546 M8: Ø14 × 6.5, slot 3 wide × 2.75 deep (midpoint of 2.5–3.0) | STEP · STL |
| din546-m10 | DIN 546 M10: Ø18 × 8, slot 3.5 wide × 3.45 deep (midpoint of 3.2–3.7) | STEP · STL |
| din546-m14 | DIN 546 M14: Ø24 × 11, slot 4 wide × 4.05 deep (midpoint of 3.8–4.3) | STEP · STL |
| din546-m16 | DIN 546 M16: Ø26 × 12, slot 4 wide × 4.05 deep (midpoint of 3.8–4.3) | STEP · STL |
| din546-m18 | DIN 546 M18: Ø29 × 13, slot 4 wide × 5.15 deep (midpoint of 4.8–5.5) | STEP · STL |
| din546-m20 | DIN 546 M20: Ø32 × 14, slot 5 wide × 5.15 deep (midpoint of 4.8–5.5) | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=slotted-round-nuts-din-546
Fits with
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.