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Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats, collar diameter, height
What are the DIN 6331 collar nut dimensions (across flats, height, collar diameter and height) for M6 to M36? · Standard part · basis: fasteners.eu DIN 6331 table (a, d1, e, m, s), cross-checked against Ganter's and AMF's DIN 6331 tables
Also called: din 6331 dimensions, collar nut m12 18 mm, m10 clamping nut collar diameter, fixture nut 1.5d, din 6331 m16 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
- 9 in table
Notes
- Columns: thread, width across flats s, total height m (1.5 d), collar diameter d1, collar height a. Ganter and AMF give the same values (e.g. M12: SW18, m 18, collar Ø25 × 4).
- M14 is omitted (sources disagree on the collar height); M10 and M12 are also sold as SW17 / SW19 variants. Thread drawn as a plain bore at the major diameter.
Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats… size chart
| thread | s | m | d1 | a |
|---|---|---|---|---|
| M6 | 10 | 9 | 14 | 3 |
| M8 | 13 | 12 | 18 | 3.5 |
| M10 | 16 | 15 | 22 | 4 |
| M12 | 18 | 18 | 25 | 4 |
| M16 | 24 | 24 | 31 | 5 |
| M20 | 30 | 30 | 37 | 6 |
| M24 | 36 | 36 | 45 | 6 |
| M30 | 46 | 45 | 58 | 8 |
| M36 | 55 | 54 | 68 | 10 |
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 |
|---|---|---|---|---|
| collar | Ø d1 × a: 14 × 3 (M6) to 68 × 10 (M36); M12 25 × 4 | workpiece or clamp-strap face (no washer) | designed | all |
| thread (plain bore at the major Ø) | d: M6 to M36 | fixture stud of the same thread | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| fasteners.eu | DIN 6331 hexagon nuts with collar, height 1.5 d: a, d1, e, m, s | web | Publisher's page; dimensions are facts |
| Ganter | DIN 6331 hex nuts with collar | web | Publisher's page; dimensions are facts |
| AMF | Hexagonal nuts with collar 1.5 d high | web | Publisher's page; dimensions are facts |
Free files
★ Free files 9 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| din6331-m6 | DIN 6331 M6: SW10, height 9, collar Ø14×3 | STEP · STL |
| din6331-m8 | DIN 6331 M8: SW13, height 12, collar Ø18×3.5 | STEP · STL |
| din6331-m10 | DIN 6331 M10: SW16, height 15, collar Ø22×4 | STEP · STL |
| din6331-m12 | DIN 6331 M12: SW18, height 18, collar Ø25×4 | STEP · STL |
| din6331-m16 | DIN 6331 M16: SW24, height 24, collar Ø31×5 | STEP · STL |
| din6331-m20 | DIN 6331 M20: SW30, height 30, collar Ø37×6 | STEP · STL |
| din6331-m24 | DIN 6331 M24: SW36, height 36, collar Ø45×6 | STEP · STL |
| din6331-m30 | DIN 6331 M30: SW46, height 45, collar Ø58×8 | STEP · STL |
| din6331-m36 | DIN 6331 M36: SW55, height 54, collar Ø68×10 | 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=hex-nuts-collar-din-6331

Fits with




Questions
What are the dimensions of an M12 DIN 6331 nut?
18 mm across flats, 18 mm tall, Ø25 × 4 mm collar.
Why use a collar nut on a fixture?
The collar spreads the clamping load without a loose washer, and the 1.5 d height takes repeated clamping.