DIN 7349 heavy washer: dimensions from M3 to M24
Thick plain washer, from M3 to M24. The standard is written for bolts used with heavy-duty spring pins (clamping sleeves), and it is also the usual choice wherever a thicker washer is needed. Pick a size to get its dimensions and CAD files.
DIN 7349 washer dimensions
| Size | d1min, mm | d2max, mm | hnom, mm |
|---|---|---|---|
| M3 | 3.2 | 9 | 1 |
| M4 | 4.3 | 12 | 1.6 |
| M5 | 5.3 | 15 | 2 |
| M6 | 6.4 | 17 | 3 |
| M8 | 8.4 | 21 | 4 |
| M10 | 10.5 | 25 | 4 |
| M12 | 13 | 30 | 6 |
| M14 | 15 | 36 | 6 |
| M16 | 17 | 40 | 6 |
| M18 | 19 | 44 | 8 |
| M20 | 21 | 44 | 8 |
| M22 | 23 | 50 | 8 |
| M24 | 25 | 50 | 10 |
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
Heavy washer dimensions
DIN 7349 is two to almost three times as thick as the normal washer and wider. Its title in the standard is washers for bolts with heavy-duty spring pins: in that joint the bolt passes through a slotted sleeve, and the washer has to bridge the sleeve without bending. At M10 it is 25 mm across and 4 mm thick, against 20 mm and 2 mm for the ISO 7089 washer.
DIN 7349 washers: common questions
- When should I use a DIN 7349 washer?
- In the joint it was made for, a bolt through a heavy-duty spring pin or clamping sleeve, and in general where a normal washer would dish under the load. Its extra thickness keeps it flat.