# Square taper washers for U-sections, DIN 434: M8–M27 8 % slope, size, hole, thickness

> What are the DIN 434 square taper washer dimensions (size, hole, thickness) for U-section flanges, M8 to M27?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it's DIN 434 table (04/2000: d, a, b, h, e, t, r), cross-checked against Westfield Fasteners' DIN 434 table; every row satisfies e = h − 0.04 b (8 % over the half width)
- Page: https://xemstudio.com/objects/square-taper-washers-din-434/ · JSON: https://xemstudio.com/api/geometry?object=square-taper-washers-din-434 · Plain text: https://xemstudio.com/objects/square-taper-washers-din-434/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, length a, width b (slope direction), thickness h at the hole axis, thickness e at the thin edge. Thick edge = 2h − e.
- The 1990 edition used holes of 14 (M12) and 18 (M16); the current values are 13.5 and 17.5. The two shallow marking grooves (depth t, radius r) are not drawn.

## 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 |
|---|---|---|---|---|
| sloped face | 8 %: thickness e at the thin edge, h at the hole (M16 4.45 → 5.9 → 7.35) | inner flange of a U-section (DIN 1026) | designed | all |
| hole | d: 9 (M8) to 30 (M27); M16 17.5 | bolt of the listed thread | designed | all |

## Sizes

| thread | d | a | b | h | e |
|---|---|---|---|---|---|
| M8 | 9 | 22 | 22 | 3.8 | 2.9 |
| M10 | 11 | 22 | 22 | 3.8 | 2.9 |
| M12 | 13.5 | 26 | 30 | 4.9 | 3.7 |
| M16 | 17.5 | 32 | 36 | 5.9 | 4.45 |
| M20 | 22 | 40 | 44 | 7 | 5.25 |
| M22 | 24 | 44 | 50 | 8 | 6 |
| M24 | 26 | 56 | 56 | 8.5 | 6.26 |
| M27 | 30 | 56 | 56 | 8.5 | 6.26 |

## Where the files are

- fasten.it: [DIN 434 square taper washers (04/2000): d, a, b, h, e, t, r](https://fasten.it/norms/norm/din_434) — web — Publisher's page; dimensions are facts
- Westfield Fasteners: [DIN 434 square taper washers for U-sections](https://www.westfieldfasteners.co.uk/Standards/Washer-SqTaperU-M.html) — web — Publisher's page; dimensions are facts

## Free STEP/STL (8 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/square-taper-washers-din-434/index.json

- din434-m8: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m8.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m8.stl) — DIN 434 M8: 22×22, hole 9, thickness 2.9–4.7 (h 3.8 at the hole), 8 %
- din434-m10: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m10.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m10.stl) — DIN 434 M10: 22×22, hole 11, thickness 2.9–4.7 (h 3.8 at the hole), 8 %
- din434-m12: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m12.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m12.stl) — DIN 434 M12: 26×30, hole 13.5, thickness 3.7–6.1 (h 4.9 at the hole), 8 %
- din434-m16: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m16.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m16.stl) — DIN 434 M16: 32×36, hole 17.5, thickness 4.45–7.35 (h 5.9 at the hole), 8 %
- din434-m20: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m20.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m20.stl) — DIN 434 M20: 40×44, hole 22, thickness 5.25–8.75 (h 7 at the hole), 8 %
- din434-m22: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m22.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m22.stl) — DIN 434 M22: 44×50, hole 24, thickness 6–10 (h 8 at the hole), 8 %
- din434-m24: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m24.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m24.stl) — DIN 434 M24: 56×56, hole 26, thickness 6.26–10.74 (h 8.5 at the hole), 8 %
- din434-m27: [STEP](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m27.step) · [STL](https://xemstudio.com/files/hardware/square-taper-washers-din-434/din434-m27.stl) — DIN 434 M27: 56×56, hole 30, thickness 6.26–10.74 (h 8.5 at the hole), 8 %

## Questions

**How thick is an M16 DIN 434 taper washer?**

5.9 mm at the hole, 4.45 mm at the thin edge, 7.35 mm at the thick edge; 32 × 36 mm, 17.5 mm hole.

**What slope does DIN 434 have?**

8 %, to match the inner flange of U-channel (DIN 1026); DIN 435 is the 14 % version for I-beams.

## Fits with

- [Flat washers, M10 to M24 (ISO 7089 / DIN 125-A)](https://xemstudio.com/objects/flat-washers-metric-m10-m24/)
- [Hex nuts, M10 to M24 (ISO 4032 / DIN 934)](https://xemstudio.com/objects/hex-nuts-metric-m10-m24/)
- [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/)