Library › Hardware › Fasteners ·

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

threadsmd1a
M6109143
M81312183.5
M101615224
M121818254
M162424315
M203030376
M243636456
M304645588
M3655546810

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.

featureexactmates withfitfiles
collarØ d1 × a: 14 × 3 (M6) to 68 × 10 (M36); M12 25 × 4workpiece or clamp-strap face (no washer)designedall
thread (plain bore at the major Ø)d: M6 to M36fixture stud of the same threaddesignedall

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

fasteners.euDIN 6331 hexagon nuts with collar, height 1.5 d: a, d1, e, m, swebPublisher's page; dimensions are facts
GanterDIN 6331 hex nuts with collarwebPublisher's page; dimensions are facts
AMFHexagonal nuts with collar 1.5 d highwebPublisher'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-m6DIN 6331 M6: SW10, height 9, collar Ø14×3STEP · STL
din6331-m8DIN 6331 M8: SW13, height 12, collar Ø18×3.5STEP · STL
din6331-m10DIN 6331 M10: SW16, height 15, collar Ø22×4STEP · STL
din6331-m12DIN 6331 M12: SW18, height 18, collar Ø25×4STEP · STL
din6331-m16DIN 6331 M16: SW24, height 24, collar Ø31×5STEP · STL
din6331-m20DIN 6331 M20: SW30, height 30, collar Ø37×6STEP · STL
din6331-m24DIN 6331 M24: SW36, height 36, collar Ø45×6STEP · STL
din6331-m30DIN 6331 M30: SW46, height 45, collar Ø58×8STEP · STL
din6331-m36DIN 6331 M36: SW55, height 54, collar Ø68×10STEP · STL
Let your AI pull this. Add 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.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=hex-nuts-collar-din-6331

Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats, collar diameter, height, isometric render of a generated part
Render of din6331-m16 from the free STEP; not to scale.

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.