# Large (fender) washers, DIN 9021 / ISO 7093: M2.5–M36 bore, outside diameter, thickness + nylon variant + 8 washer files

> What are the dimensions of a DIN 9021 large washer, and what size is an M8 fender washer?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: Westfield Fasteners' DIN 9021 table, checked against fasteners.eu's DIN 9021 page (same d1, d2, h on every size) and JC Fasteners' nylon sheet; eight washer files
- Page: https://xemstudio.com/objects/large-washers-din-9021-iso-7093/ · JSON: https://xemstudio.com/api/geometry?object=large-washers-din-9021-iso-7093 · Plain text: https://xemstudio.com/objects/large-washers-din-9021-iso-7093/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/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 50.0 | 50.0 | 3.0 |

**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

- DIN 9021 is the plain washer with an outside diameter of about 3 d (fender washer, body-work washer, large-OD washer, 'panel washer'). Columns: bore d1 (nominal = minimum, then maximum), outside d2 (nominal = maximum, then minimum), thickness h (nominal, maximum, minimum), all mm. Westfield and fasteners.eu print identical d1, d2 and h for every size M2.5 to M36. Westfield cites DIN 9021 and ISO 7093; fasteners.eu names DIN EN ISO 7093-1 as the current norm. The ISO 7093-1 text itself was not read, so equality of every figure with ISO 7093-1 is not asserted here.
- The nylon row set: JC Fasteners' nylon DIN 9021 sheet prints the same d1, d2 and h as the steel rows for every size M2.5 to M36, and adds an M2 row (bore 2.2 / 2.34, outside 7 / 6.64, h 0.8 / 0.9 / 0.7), which is the only extra row shown. Its M36 minimum thickness (8.00) disagrees with its own nominal and the steel tables (6.8), so that value is dropped; its service-temperature figure looked like a typo and is not used. Nylon washers to other standards (flat polyamide washers, DIN 125 style) were not verified from a table and are not listed.
- Files are Xem-drawn flat annuli at the nominal published sizes (bore = d1 nominal, outside = d2 nominal, thickness = h nominal) for M3, M4, M5, M6, M8, M10, M12 and M16. Edge radii and tolerances are not modelled. A bolt of the thread size passes through the bore with the d1 clearance. Plain flat washers: flat-washers-metric, flat-washers-metric-m10-m24, flat-washers-iso-7090-m5-m64.
- McMaster-Carr sells oversized flat washers with per-part STEP; its large-diameter washer category is linked, not copied.

## 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 |
|---|---|---|---|---|
| bore (d1) | M3 3.2, M4 4.3, M5 5.3, M6 6.4, M8 8.4, M10 10.5, M12 13, M16 17 mm (nominal = minimum) | screw / bolt of the thread size; plain cylinder at the thread major diameter | designed | washer-din-9021-* |
| outside (d2) | M3 9, M4 12, M5 15, M6 18, M8 24, M10 30, M12 37, M16 50 mm (nominal = maximum) | round counterbore or boss that seats the washer: Ø = d2 + your process clearance | slide | washer-din-9021-* |
| thickness (h) | 0.8, 1, 1.2, 1.6, 2, 2.5, 3, 3 mm nominal for M3 to M16 | recess depth under the washer | designed | washer-din-9021-* |

## Sizes

| standard | thread | d1 nom = min | d1 max | d2 nom = max | d2 min | h nom | h max | h min |
|---|---|---|---|---|---|---|---|---|
| DIN 9021 steel | M2.5 | 2.7 | 2.84 | 8 | 7.64 | 0.8 | 0.9 | 0.7 |
| DIN 9021 steel | M3 | 3.2 | 3.38 | 9 | 8.64 | 0.8 | 0.9 | 0.7 |
| DIN 9021 steel | M3.5 | 3.7 | 3.88 | 11 | 10.57 | 0.8 | 0.9 | 0.7 |
| DIN 9021 steel | M4 | 4.3 | 4.48 | 12 | 11.57 | 1 | 1.1 | 0.9 |
| DIN 9021 steel | M5 | 5.3 | 5.48 | 15 | 14.57 | 1.2 | 1.4 | 1 |
| DIN 9021 steel | M6 | 6.4 | 6.62 | 18 | 17.57 | 1.6 | 1.8 | 1.4 |
| DIN 9021 steel | M7 | 7.4 | 7.62 | 22 | 21.48 | 2 | 2.2 | 1.8 |
| DIN 9021 steel | M8 | 8.4 | 8.62 | 24 | 23.48 | 2 | 2.2 | 1.8 |
| DIN 9021 steel | M10 | 10.5 | 10.77 | 30 | 29.48 | 2.5 | 2.7 | 2.3 |
| DIN 9021 steel | M12 | 13 | 13.27 | 37 | 36.38 | 3 | 3.3 | 2.7 |
| DIN 9021 steel | M14 | 15 | 15.27 | 44 | 43.38 | 3 | 3.3 | 2.7 |
| DIN 9021 steel | M16 | 17 | 17.27 | 50 | 49.38 | 3 | 3.3 | 2.7 |
| DIN 9021 steel | M18 | 20 | 20.52 | 56 | 54.1 | 4 | 4.6 | 3.4 |
| DIN 9021 steel | M20 | 22 | 22.52 | 60 | 58.1 | 4 | 4.6 | 3.4 |
| DIN 9021 steel | M24 | 26 | 26.84 | 72 | 70.1 | 5 | 6 | 4 |
| DIN 9021 steel | M30 | 33 | 34 | 92 | 89.8 | 6 | 7 | 5 |
| DIN 9021 steel | M36 | 39 | 40 | 110 | 107.8 | 8 | 9.2 | 6.8 |
| DIN 9021 nylon (JC Fasteners) | M2 | 2.2 | 2.34 | 7 | 6.64 | 0.8 | 0.9 | 0.7 |

## Where the files are

- Westfield Fasteners: [Washers with large outside diameter, DIN 9021 (cites ISO 7093): d1 min / max, d2 max / min, h nom / max / min, M2.5 to M36](https://www.westfieldfasteners.co.uk/Standards/Washer-od3nom-M.pdf) — web — Publisher's page; dimensions are facts
- fasteners.eu: [DIN 9021 plain washer, outer diameter about 3 d (current norm DIN EN ISO 7093-1): d1, d2, h, weight](https://www.fasteners.eu/standards/din/9021/) — web — Publisher's page; dimensions are facts
- JC Fasteners: [DIN 9021 large washer, nylon: d1, d2, h by size, M2 to M36](https://www.jcfasteners.com/wp-content/uploads/DIN-9021-Washer-Large-K3D03-NYLON.pdf) — web — Maker data sheet; numbers only
- McMaster-Carr: [Large-diameter washers (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/large-diameter-washers) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

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

Index: https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/index.json

- washer-din-9021-m3-d1-3.2-d2-9-h-0.8: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m3-d1-3.2-d2-9-h-0.8.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m3-d1-3.2-d2-9-h-0.8.stl) — M3 DIN 9021 large washer at nominal size: bore Ø3.2 (d1 nom = min), outside Ø9 (d2 nom = max), thickness 0.8 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m4-d1-4.3-d2-12-h-1: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m4-d1-4.3-d2-12-h-1.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m4-d1-4.3-d2-12-h-1.stl) — M4 DIN 9021 large washer at nominal size: bore Ø4.3 (d1 nom = min), outside Ø12 (d2 nom = max), thickness 1 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m5-d1-5.3-d2-15-h-1.2: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m5-d1-5.3-d2-15-h-1.2.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m5-d1-5.3-d2-15-h-1.2.stl) — M5 DIN 9021 large washer at nominal size: bore Ø5.3 (d1 nom = min), outside Ø15 (d2 nom = max), thickness 1.2 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m6-d1-6.4-d2-18-h-1.6: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m6-d1-6.4-d2-18-h-1.6.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m6-d1-6.4-d2-18-h-1.6.stl) — M6 DIN 9021 large washer at nominal size: bore Ø6.4 (d1 nom = min), outside Ø18 (d2 nom = max), thickness 1.6 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m8-d1-8.4-d2-24-h-2: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m8-d1-8.4-d2-24-h-2.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m8-d1-8.4-d2-24-h-2.stl) — M8 DIN 9021 large washer at nominal size: bore Ø8.4 (d1 nom = min), outside Ø24 (d2 nom = max), thickness 2 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m10-d1-10.5-d2-30-h-2.5: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m10-d1-10.5-d2-30-h-2.5.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m10-d1-10.5-d2-30-h-2.5.stl) — M10 DIN 9021 large washer at nominal size: bore Ø10.5 (d1 nom = min), outside Ø30 (d2 nom = max), thickness 2.5 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m12-d1-13-d2-37-h-3: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m12-d1-13-d2-37-h-3.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m12-d1-13-d2-37-h-3.stl) — M12 DIN 9021 large washer at nominal size: bore Ø13 (d1 nom = min), outside Ø37 (d2 nom = max), thickness 3 mm (h nom); plain flat annulus, no edge radius
- washer-din-9021-m16-d1-17-d2-50-h-3: [STEP](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m16-d1-17-d2-50-h-3.step) · [STL](https://xemstudio.com/files/hardware/large-washers-din-9021-iso-7093/washer-din-9021-m16-d1-17-d2-50-h-3.stl) — M16 DIN 9021 large washer at nominal size: bore Ø17 (d1 nom = min), outside Ø50 (d2 nom = max), thickness 3 mm (h nom); plain flat annulus, no edge radius

## Questions

**What is the outside diameter of an M8 DIN 9021 washer?**

24 mm (maximum, nominal), 23.48 mm minimum; bore 8.4 mm, thickness 2 mm nominal (1.8 to 2.2).

**What is the difference between DIN 9021 and DIN 125?**

DIN 9021 has an outside diameter of about 3 d (M8: 24 mm); a normal ISO 7089 / DIN 125 washer is about 2 d (M8: 16 mm). Thickness is also bigger: 2 mm against 1.6 mm at M8.

**Is a DIN 9021 washer the same as ISO 7093?**

Westfield's table cites both and fasteners.eu names DIN EN ISO 7093-1 as the current norm; the ISO text was not read, so check ISO 7093-1 for tolerance classes.

## Fits with

- [Flat washers, M2–M8 (ISO 7089)](https://xemstudio.com/objects/flat-washers-metric/)
- [Flat washers, M10 to M24 (ISO 7089 / DIN 125-A)](https://xemstudio.com/objects/flat-washers-metric-m10-m24/)
- [Flat washers, ISO 7090 (chamfered, normal series): M5–M64 bore, outside diameter, thickness + M30–M48 washer files](https://xemstudio.com/objects/flat-washers-iso-7090-m5-m64/)
- [Spring lock washers, DIN 127 B (split washers, rectangular section): M2–M100 bore, outside diameter, width, thickness, free height](https://xemstudio.com/objects/spring-lock-washers-din-127-b/)
- [Serrated (tooth) lock washers, DIN 6798 forms A, J, V: M1.6–M30 bore, outside diameter, thickness, number of teeth](https://xemstudio.com/objects/serrated-lock-washers-din-6798/)
- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)