DIN 9021 / ISO 7093 large washer: dimensions from M3 to M24
Plain washer with an outside diameter of about three times the bolt size, from M3 to M24. Pick a size to get its dimensions and CAD files; where DIN 9021 differs, switch to the DIN version.
ISO 7093 / DIN 9021 large washer dimensions
| Size | d1min, mm | d2max, mm | hnom, mm |
|---|---|---|---|
| M3 | 3.2 | 9 | 0.8 |
| M4 | 4.3 | 12 | 1 |
| M5 | 5.3 | 15 | 1 |
| M6 | 6.4 | 18 | 1.6 |
| M8 | 8.4 | 24 | 2 |
| M10 | 10.5 | 30 | 2.5 |
| M12 | 13 | 37 | 3 |
| M14 | 15 | 44 | 3 |
| M16 | 17 | 50 | 3 |
| M18 | 19 | 56 | 4 |
| M20 | 21 | 60 | 4 |
| M22 | 23 | 66 | 5 |
| M24 | 25 | 72 | 5 |
Where DIN 9021 differs from ISO 7093
| Size | d1ISO 7093 | d1DIN 9021 | hISO 7093 | hDIN 9021 |
|---|---|---|---|---|
| M5 | 5.3 | 5.3 | 1 | 1.2 |
| M18 | 19 | 20 | 4 | 4 |
| M20 | 21 | 22 | 4 | 4 |
| M24 | 25 | 26 | 5 | 5 |
DIN 9021 is withdrawn but parts to it are still sold.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 7093 vs DIN 9021
Many catalogues list the DIN 9021 table under the ISO 7093 name. They differ in the thickness of M5 and the hole of M18, M20 and M24; those DIN 9021 sizes have their own files. At M20, for example, the ISO hole is at least 21 mm and the DIN hole 22 mm.
Fender washer dimensions and uses
A large washer spreads the clamping force over a wider area, which protects wood, plastics and thin sheet and covers oversized or slotted holes. At M6 it is 18 mm across against 12 mm for the normal washer, with the same 6.4 mm hole and 1.6 mm thickness.
DIN 9021 washers: common questions
- What are the dimensions of an M20 large washer?
- An ISO 7093 M20 washer has a hole of at least 21 mm, an outside diameter of up to 60 mm and a thickness of 4 mm. In DIN 9021 the hole is 22 mm.