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Flat washers, M2–M8 (ISO 7089)
What are the dimensions of M3, M4 and M5 flat washers? · Hardware · basis: ISO 7089 (normal series)
- sizes
- 7 in table
Notes
- Inner diameter clears the screw; outer diameter is what a counterbore has to accommodate if the washer sits in it.
Sizes
| thread | id_mm | od_mm | thickness_mm |
|---|---|---|---|
| M2 | 2.2 | 5 | 0.3 |
| M2.5 | 2.7 | 6 | 0.5 |
| M3 | 3.2 | 7 | 0.5 |
| M4 | 4.3 | 9 | 0.8 |
| M5 | 5.3 | 10 | 1 |
| M6 | 6.4 | 12 | 1.6 |
| M8 | 8.4 | 16 | 1.6 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | Washers (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
| Wikipedia | Washer (hardware) | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 7 parts, generated by Xem Studio from the standard. CC BY 4.0. Threads are plain cylinders at major diameter. index.json
| washer-m2 | ISO 7089 M2 | STEP · STL |
| washer-m2.5 | ISO 7089 M2.5 | STEP · STL |
| washer-m3 | ISO 7089 M3 | STEP · STL |
| washer-m4 | ISO 7089 M4 | STEP · STL |
| washer-m5 | ISO 7089 M5 | STEP · STL |
| washer-m6 | ISO 7089 M6 | STEP · STL |
| washer-m8 | ISO 7089 M8 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=flat-washers-metric
Fits with
Questions
What is the outer diameter of an M3 washer?
7 mm OD, 3.2 mm ID, 0.5 mm thick (ISO 7089). M4: 9 mm OD; M5: 10 mm OD; M6: 12 mm OD; M8: 16 mm OD.
Do I need a washer under a screw head in a 3D print?
Yes for soft plastics or slotted holes: it spreads the load and stops the head sinking in. Size the counterbore to the washer OD, not the head.