DIN 439 / ISO 4035 thin hex nut (jam nut): dimensions
Thin hexagon nut (jam nut), chamfered both sides, from M3 to M24. Pick a size to get its dimensions and CAD files; where DIN 439 differs, switch to the DIN version.
ISO 4035 / DIN 439 thin nut dimensions
| Size | Pmm | snom, mm | mmax, mm | emin, mm |
|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 1.8 | 6.01 |
| M4 | 0.7 | 7 | 2.2 | 7.66 |
| M5 | 0.8 | 8 | 2.7 | 8.79 |
| M6 | 1 | 10 | 3.2 | 11.05 |
| M8 | 1.25 | 13 | 4 | 14.38 |
| M10 | 1.5 | 16 | 5 | 17.77 |
| M12 | 1.75 | 18 | 6 | 20.03 |
| M14 | 2 | 21 | 7 | 23.36 |
| M16 | 2 | 24 | 8 | 26.75 |
| M18 | 2.5 | 27 | 9 | 29.56 |
| M20 | 2.5 | 30 | 10 | 32.95 |
| M22 | 2.5 | 34 | 11 | 37.29 |
| M24 | 3 | 36 | 12 | 39.55 |
Where DIN 439 differs from ISO 4035
| Size | sISO 4035 | sDIN 439 |
|---|---|---|
| M10 | 16 | 17 |
| M12 | 18 | 19 |
| M14 | 21 | 22 |
| M22 | 34 | 32 |
DIN 439 is withdrawn but parts to it are still sold. Only the sizes listed here differ; in every other size both standards give the same part. Pick the standard in the selector above to get the matching CAD files.
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
ISO 4035 vs DIN 439
The height is the same; the width across flats changes in M10, M12, M14 and M22. At M12 the ISO 4035 nut is 18 mm across flats and the DIN 439 nut 19 mm, both 6 mm high. Those DIN 439 sizes have their own CAD files.
Jam nut dimensions and use
A thin nut is used where there is little room, or as a jam nut: tightened against a regular nut on the same thread so the two lock each other. Because it carries less thread, it is not meant to take the full load of the bolt on its own. The metric nut size chart shows how its height compares with the other nuts.
DIN 439 thin nuts: common questions
- How thick is an M12 thin nut?
- Up to 6 mm, against up to 10.8 mm for a regular ISO 4032 M12 nut. The spanner size is the same, 18 mm (19 mm in DIN 439).