# Square washers for timber, DIN 436: M10–M36 side length, hole, thickness

> What are the DIN 436 square washer dimensions (side, hole, thickness) for M10 to M36?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: Westfield Fasteners' DIN 436 table (d, a, s), cross-checked against fasten.it and spot checks of Kramp, Würth, Cromwell, SWG and Keller & Kalmbach listings
- Page: https://xemstudio.com/objects/square-washers-din-436/ · JSON: https://xemstudio.com/api/geometry?object=square-washers-din-436 · Plain text: https://xemstudio.com/objects/square-washers-din-436/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**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.

## Notes

- Columns: thread, hole d, side length a, thickness s. Values are from the 1990 edition; the 2024 revision is paywalled and was not checked.
- Edges drawn sharp.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| hole | d (M12 13.5, M24 26) | bolt, coach screw or threaded rod of the listed thread | designed | all |
| bearing face | a × a (M12 40, M24 80) | timber surface | designed | all |

## Sizes

| thread | d | a | s |
|---|---|---|---|
| M10 | 11 | 30 | 3 |
| M12 | 13.5 | 40 | 4 |
| M16 | 17.5 | 50 | 5 |
| M20 | 22 | 60 | 5 |
| M22 | 24 | 70 | 6 |
| M24 | 26 | 80 | 6 |
| M27 | 30 | 90 | 6 |
| M30 | 33 | 95 | 6 |
| M33 | 36 | 100 | 6 |
| M36 | 39 | 110 | 8 |

## Where the files are

- Westfield Fasteners: [DIN 436 square plate flat washers: d1, a, h](https://www.westfieldfasteners.co.uk/Standards/Washer-SqPlate-M.html) — web — Publisher's page; dimensions are facts
- fasten.it: [DIN 436 square washers for wood constructions (05/1990)](https://fasten.it/en/norms/norm/din_436) — web — Publisher's page; dimensions are facts

## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/square-washers-din-436/index.json

- din436-m10: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m10.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m10.stl) — DIN 436 M10: 30 × 30 × 3, hole 11
- din436-m12: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m12.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m12.stl) — DIN 436 M12: 40 × 40 × 4, hole 13.5
- din436-m16: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m16.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m16.stl) — DIN 436 M16: 50 × 50 × 5, hole 17.5
- din436-m20: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m20.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m20.stl) — DIN 436 M20: 60 × 60 × 5, hole 22
- din436-m22: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m22.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m22.stl) — DIN 436 M22: 70 × 70 × 6, hole 24
- din436-m24: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m24.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m24.stl) — DIN 436 M24: 80 × 80 × 6, hole 26
- din436-m27: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m27.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m27.stl) — DIN 436 M27: 90 × 90 × 6, hole 30
- din436-m30: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m30.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m30.stl) — DIN 436 M30: 95 × 95 × 6, hole 33
- din436-m33: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m33.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m33.stl) — DIN 436 M33: 100 × 100 × 6, hole 36
- din436-m36: [STEP](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m36.step) · [STL](https://xemstudio.com/files/hardware/square-washers-din-436/din436-m36.stl) — DIN 436 M36: 110 × 110 × 8, hole 39

## Questions

**How big is an M12 square washer?**

DIN 436 M12: 40 × 40 mm, 4 mm thick, 13.5 mm hole.

**Did the 2024 edition of DIN 436 change the sizes?**

No. DIN says the 2024 edition is an editorial revision of the 1990 one, so the dimensions here still apply.

## Fits with

- [Round washers for timber, DIN 440 form R: M5–M36 bore, outside diameter, thickness](https://xemstudio.com/objects/round-washers-timber-din-440-r/)
- [Large (fender) washers, DIN 9021 / ISO 7093: M2.5–M36 bore, outside diameter, thickness + nylon variant + 8 washer files](https://xemstudio.com/objects/large-washers-din-9021-iso-7093/)
- [Carriage bolts, ASME B18.5 round head square neck, #10 to 1 in: head, square neck, body diameter + envelope models](https://xemstudio.com/objects/carriage-bolts-asme-b18-5/)
- [Hex lag screws, 1/4 to 1/2 in (ASME B18.2.1): shank, head width and height, pilot holes + envelope models](https://xemstudio.com/objects/lag-screws-hex-inch/)