# Woodruff keys, metric (DIN 6888 / ISO 3912): b × h × d2, keyseat depths t1 and t2, shaft ranges

> What are the dimensions of a metric Woodruff key (DIN 6888) such as 5 × 6.5 × 16, and the shaft and hub keyseat depths?

- Category: Hardware › Gears, cranks & flywheels
- Kind: Standard part
- Basis: DIN 6888 tables as published by OPAC (b, h, d2, t1, t2) and fasten.it (shaft ranges, l), checked against McMaster-Carr; ISO 3912 limits from fasten.it
- Page: https://xemstudio.com/objects/woodruff-keys-din-6888/ · JSON: https://xemstudio.com/api/geometry?object=woodruff-keys-din-6888 · Plain text: https://xemstudio.com/objects/woodruff-keys-din-6888/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Metric Woodruff keys are named b × h × d2: width, height, disc diameter. The key is the segment of a disc of diameter d2 that stands h above the bottom of the arc, with a flat top. The printed length l is the flat's chord: l = 2·√(R² − (R − h)²) with R = d2/2. That equation reproduces the tabulated l for all 24 sizes (to 0.01 mm), so the key files are drawn exactly that way.
- Two series (A and B) share each key size but sit on different shaft ranges, so the keyseat depth differs: the deeper seat (series B) goes with the larger shaft range. A dash means the size has no series A range. In both series the seat depths add up the same way: t1 + t2 = h + 0.2 mm, which holds for every row.
- Files: 24 key solids and 24 example shafts with the keyseat cut at t1 (series A where it exists, otherwise B). The example shaft is the largest diameter of that series' range ('38+' is drawn as 38 mm), is 2 shaft diameters long, and the seat is a circle of d2 and width b, bottom t1 below the top line of the shaft. The hub seat depth t2 is in the table only. Tolerances (b h9, h h12) are in the standard, not in the files.
- Status: fasten.it marks DIN 6888 (edition 08/1956) as cancelled; ISO 3912 (1977) covers 16 of these 24 sizes (marked in the table). The depths come from one maker's table (OPAC) and are checked by the t1 + t2 = h + 0.2 identity; width, height, d2 and l agree across OPAC, fasten.it and McMaster. Shaft ranges are from fasten.it only.
- Left out: edge chamfers or radii, which the sources do not give; the 3 × 5 × 13 and 6 × 10 × 25 sizes are marked outside the DIN list on OPAC's page but are listed on fasten.it and McMaster, so they are kept in the table and files.

## Sizes

| b × h × d2, mm | chord length l, mm | shaft d1, series A / B, mm | shaft seat depth t1, A / B, mm | hub seat depth t2, A / B, mm | also in ISO 3912 |
|---|---|---|---|---|---|
| 1 × 1.4 × 4 | 3.82 | 3–4 / 6–8 | 1 / 1 | 0.6 / 0.6 | yes |
| 1.5 × 2.6 × 7 | 6.76 | 4–6 / 8–10 | 2 / 2 | 0.8 / 0.8 | yes |
| 2 × 2.6 × 7 | 6.76 | 6–8 / 10–12 | 1.8 / 1.8 | 1 / 1 | yes |
| 2 × 3.7 × 10 | 9.66 | 6–8 / 10–12 | 2.9 / 2.9 | 1 / 1 | yes |
| 2.5 × 3.7 × 10 | 9.66 | 8–10 / 12–17 | 2.9 / 2.9 | 1 / 1 | yes |
| 3 × 3.7 × 10 | 9.66 | 8–10 / 12–17 | 2.5 / 2.8 | 1.4 / 1.1 | DIN only |
| 3 × 5 × 13 | 12.65 | 8–10 / 12–17 | 3.8 / 4.1 | 1.4 / 1.1 | yes |
| 3 × 6.5 × 16 | 15.72 | – / 12–17 | 5.3 / 5.6 | 1.4 / 1.1 | yes |
| 4 × 5 × 13 | 12.65 | 10–12 / 17–22 | 3.5 / 4.1 | 1.7 / 1.1 | DIN only |
| 4 × 6.5 × 16 | 15.72 | 10–12 / 17–22 | 5 / 5.6 | 1.7 / 1.1 | yes |
| 4 × 7.5 × 19 | 18.57 | – / 17–22 | 6 / 6.6 | 1.7 / 1.1 | yes |
| 5 × 6.5 × 16 | 15.72 | 12–17 / 22–30 | 4.5 / 5.4 | 2.2 / 1.3 | yes |
| 5 × 7.5 × 19 | 18.57 | 12–17 / 22–30 | 5.5 / 6.4 | 2.2 / 1.3 | yes |
| 5 × 9 × 22 | 21.63 | – / 22–30 | 7 / 7.9 | 2.2 / 1.3 | yes |
| 6 × 7.5 × 19 | 18.57 | 17–22 / 22–30 | 5.1 / 6 | 2.6 / 1.7 | DIN only |
| 6 × 9 × 22 | 21.63 | 17–22 / 30–38 | 6.6 / 7.5 | 2.6 / 1.7 | yes |
| 6 × 10 × 25 | 24.49 | 17–22 / 30–38 | 7.6 / 8.5 | 2.6 / 1.7 | yes |
| 6 × 11 × 28 | 27.35 | – / 30–38 | 8.6 / 9.5 | 2.6 / 1.7 | DIN only |
| 8 × 9 × 22 | 21.63 | 22–30 / 38+ | 6.2 / 7.5 | 3 / 1.7 | DIN only |
| 8 × 11 × 28 | 27.35 | 22–30 / 38+ | 8.2 / 9.5 | 3 / 1.7 | yes |
| 8 × 13 × 32 | 31.43 | – / 38+ | 10.2 / 11.5 | 3 / 1.7 | DIN only |
| 10 × 11 × 28 | 27.35 | 30–38 / 38+ | 7.8 / 9.1 | 3.4 / 2.1 | DIN only |
| 10 × 13 × 32 | 31.43 | 30–38 / 38+ | 9.8 / 11.1 | 3.4 / 2.1 | yes |
| 10 × 16 × 45 | 43.08 | – / 38+ | 12.8 / 14.1 | 3.4 / 2.1 | DIN only |

## Where the files are

- OPAC: [DIN 6888 Woodruff keys: b x h x d2 with keyway depths t1 (shaft) and t2 (hub), series A and B](https://www.opac.net/en/producto-164-din-6888) — web — Publisher's page; dimensions are facts
- fasten.it: [DIN 6888 Standard dimensions for Woodruff keys: b, h, shaft diameters d1 (form A / B), d2, l](https://fasten.it/norms/norm/din_6888) — web — Publisher's page; dimensions are facts
- fasten.it: [ISO 3912 Woodruff keys: limits on b, h, d2](https://fasten.it/Norms/Norm/ISO_3912) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Woodruff keys: inch key sizes (width, diameter, height, length) and metric sizes](https://www.mcmaster.com/keys/key-type~woodruff/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (48 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/woodruff-keys-din-6888/index.json

- woodruff-key-1x1-4x4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-1x1-4x4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-1x1-4x4.stl) — Woodruff key 1 × 1.4 × 4 mm (b × h × d2): width 1, height 1.4, disc diameter 4; chord 3.82 mm; nominal values, no edge breaks
- woodruff-keyseat-1x1-4x4-shaft-4mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-1x1-4x4-shaft-4mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-1x1-4x4-shaft-4mm-series-a.stl) — Shaft keyseat for 1 × 1.4 × 4: example shaft ⌀4 mm (top of the series A range 3 to 4 mm) × 8 mm long, circular seat ⌀4 × 1 wide, bottom 1 mm (t1, series A) below the top line
- woodruff-key-1-5x2-6x7: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-1-5x2-6x7.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-1-5x2-6x7.stl) — Woodruff key 1.5 × 2.6 × 7 mm (b × h × d2): width 1.5, height 2.6, disc diameter 7; chord 6.76 mm; nominal values, no edge breaks
- woodruff-keyseat-1-5x2-6x7-shaft-6mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-1-5x2-6x7-shaft-6mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-1-5x2-6x7-shaft-6mm-series-a.stl) — Shaft keyseat for 1.5 × 2.6 × 7: example shaft ⌀6 mm (top of the series A range 4 to 6 mm) × 12 mm long, circular seat ⌀7 × 1.5 wide, bottom 2 mm (t1, series A) below the top line
- woodruff-key-2x2-6x7: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2x2-6x7.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2x2-6x7.stl) — Woodruff key 2 × 2.6 × 7 mm (b × h × d2): width 2, height 2.6, disc diameter 7; chord 6.76 mm; nominal values, no edge breaks
- woodruff-keyseat-2x2-6x7-shaft-8mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2x2-6x7-shaft-8mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2x2-6x7-shaft-8mm-series-a.stl) — Shaft keyseat for 2 × 2.6 × 7: example shaft ⌀8 mm (top of the series A range 6 to 8 mm) × 16 mm long, circular seat ⌀7 × 2 wide, bottom 1.8 mm (t1, series A) below the top line
- woodruff-key-2x3-7x10: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2x3-7x10.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2x3-7x10.stl) — Woodruff key 2 × 3.7 × 10 mm (b × h × d2): width 2, height 3.7, disc diameter 10; chord 9.66 mm; nominal values, no edge breaks
- woodruff-keyseat-2x3-7x10-shaft-8mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2x3-7x10-shaft-8mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2x3-7x10-shaft-8mm-series-a.stl) — Shaft keyseat for 2 × 3.7 × 10: example shaft ⌀8 mm (top of the series A range 6 to 8 mm) × 16 mm long, circular seat ⌀10 × 2 wide, bottom 2.9 mm (t1, series A) below the top line
- woodruff-key-2-5x3-7x10: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2-5x3-7x10.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-2-5x3-7x10.stl) — Woodruff key 2.5 × 3.7 × 10 mm (b × h × d2): width 2.5, height 3.7, disc diameter 10; chord 9.66 mm; nominal values, no edge breaks
- woodruff-keyseat-2-5x3-7x10-shaft-10mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2-5x3-7x10-shaft-10mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-2-5x3-7x10-shaft-10mm-series-a.stl) — Shaft keyseat for 2.5 × 3.7 × 10: example shaft ⌀10 mm (top of the series A range 8 to 10 mm) × 20 mm long, circular seat ⌀10 × 2.5 wide, bottom 2.9 mm (t1, series A) below the top line
- woodruff-key-3x3-7x10: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x3-7x10.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x3-7x10.stl) — Woodruff key 3 × 3.7 × 10 mm (b × h × d2): width 3, height 3.7, disc diameter 10; chord 9.66 mm; nominal values, no edge breaks
- woodruff-keyseat-3x3-7x10-shaft-10mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x3-7x10-shaft-10mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x3-7x10-shaft-10mm-series-a.stl) — Shaft keyseat for 3 × 3.7 × 10: example shaft ⌀10 mm (top of the series A range 8 to 10 mm) × 20 mm long, circular seat ⌀10 × 3 wide, bottom 2.5 mm (t1, series A) below the top line
- woodruff-key-3x5x13: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x5x13.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x5x13.stl) — Woodruff key 3 × 5 × 13 mm (b × h × d2): width 3, height 5, disc diameter 13; chord 12.65 mm; nominal values, no edge breaks
- woodruff-keyseat-3x5x13-shaft-10mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x5x13-shaft-10mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x5x13-shaft-10mm-series-a.stl) — Shaft keyseat for 3 × 5 × 13: example shaft ⌀10 mm (top of the series A range 8 to 10 mm) × 20 mm long, circular seat ⌀13 × 3 wide, bottom 3.8 mm (t1, series A) below the top line
- woodruff-key-3x6-5x16: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x6-5x16.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-3x6-5x16.stl) — Woodruff key 3 × 6.5 × 16 mm (b × h × d2): width 3, height 6.5, disc diameter 16; chord 15.72 mm; nominal values, no edge breaks
- woodruff-keyseat-3x6-5x16-shaft-17mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x6-5x16-shaft-17mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-3x6-5x16-shaft-17mm-series-b.stl) — Shaft keyseat for 3 × 6.5 × 16: example shaft ⌀17 mm (top of the series B range 12 to 17 mm) × 34 mm long, circular seat ⌀16 × 3 wide, bottom 5.6 mm (t1, series B) below the top line
- woodruff-key-4x5x13: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x5x13.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x5x13.stl) — Woodruff key 4 × 5 × 13 mm (b × h × d2): width 4, height 5, disc diameter 13; chord 12.65 mm; nominal values, no edge breaks
- woodruff-keyseat-4x5x13-shaft-12mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x5x13-shaft-12mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x5x13-shaft-12mm-series-a.stl) — Shaft keyseat for 4 × 5 × 13: example shaft ⌀12 mm (top of the series A range 10 to 12 mm) × 24 mm long, circular seat ⌀13 × 4 wide, bottom 3.5 mm (t1, series A) below the top line
- woodruff-key-4x6-5x16: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x6-5x16.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x6-5x16.stl) — Woodruff key 4 × 6.5 × 16 mm (b × h × d2): width 4, height 6.5, disc diameter 16; chord 15.72 mm; nominal values, no edge breaks
- woodruff-keyseat-4x6-5x16-shaft-12mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x6-5x16-shaft-12mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x6-5x16-shaft-12mm-series-a.stl) — Shaft keyseat for 4 × 6.5 × 16: example shaft ⌀12 mm (top of the series A range 10 to 12 mm) × 24 mm long, circular seat ⌀16 × 4 wide, bottom 5 mm (t1, series A) below the top line
- woodruff-key-4x7-5x19: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x7-5x19.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-4x7-5x19.stl) — Woodruff key 4 × 7.5 × 19 mm (b × h × d2): width 4, height 7.5, disc diameter 19; chord 18.57 mm; nominal values, no edge breaks
- woodruff-keyseat-4x7-5x19-shaft-22mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x7-5x19-shaft-22mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-4x7-5x19-shaft-22mm-series-b.stl) — Shaft keyseat for 4 × 7.5 × 19: example shaft ⌀22 mm (top of the series B range 17 to 22 mm) × 44 mm long, circular seat ⌀19 × 4 wide, bottom 6.6 mm (t1, series B) below the top line
- woodruff-key-5x6-5x16: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x6-5x16.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x6-5x16.stl) — Woodruff key 5 × 6.5 × 16 mm (b × h × d2): width 5, height 6.5, disc diameter 16; chord 15.72 mm; nominal values, no edge breaks
- woodruff-keyseat-5x6-5x16-shaft-17mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x6-5x16-shaft-17mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x6-5x16-shaft-17mm-series-a.stl) — Shaft keyseat for 5 × 6.5 × 16: example shaft ⌀17 mm (top of the series A range 12 to 17 mm) × 34 mm long, circular seat ⌀16 × 5 wide, bottom 4.5 mm (t1, series A) below the top line
- woodruff-key-5x7-5x19: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x7-5x19.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x7-5x19.stl) — Woodruff key 5 × 7.5 × 19 mm (b × h × d2): width 5, height 7.5, disc diameter 19; chord 18.57 mm; nominal values, no edge breaks
- woodruff-keyseat-5x7-5x19-shaft-17mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x7-5x19-shaft-17mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x7-5x19-shaft-17mm-series-a.stl) — Shaft keyseat for 5 × 7.5 × 19: example shaft ⌀17 mm (top of the series A range 12 to 17 mm) × 34 mm long, circular seat ⌀19 × 5 wide, bottom 5.5 mm (t1, series A) below the top line
- woodruff-key-5x9x22: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x9x22.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-5x9x22.stl) — Woodruff key 5 × 9 × 22 mm (b × h × d2): width 5, height 9, disc diameter 22; chord 21.63 mm; nominal values, no edge breaks
- woodruff-keyseat-5x9x22-shaft-30mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x9x22-shaft-30mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-5x9x22-shaft-30mm-series-b.stl) — Shaft keyseat for 5 × 9 × 22: example shaft ⌀30 mm (top of the series B range 22 to 30 mm) × 60 mm long, circular seat ⌀22 × 5 wide, bottom 7.9 mm (t1, series B) below the top line
- woodruff-key-6x7-5x19: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x7-5x19.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x7-5x19.stl) — Woodruff key 6 × 7.5 × 19 mm (b × h × d2): width 6, height 7.5, disc diameter 19; chord 18.57 mm; nominal values, no edge breaks
- woodruff-keyseat-6x7-5x19-shaft-22mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x7-5x19-shaft-22mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x7-5x19-shaft-22mm-series-a.stl) — Shaft keyseat for 6 × 7.5 × 19: example shaft ⌀22 mm (top of the series A range 17 to 22 mm) × 44 mm long, circular seat ⌀19 × 6 wide, bottom 5.1 mm (t1, series A) below the top line
- woodruff-key-6x9x22: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x9x22.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x9x22.stl) — Woodruff key 6 × 9 × 22 mm (b × h × d2): width 6, height 9, disc diameter 22; chord 21.63 mm; nominal values, no edge breaks
- woodruff-keyseat-6x9x22-shaft-22mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x9x22-shaft-22mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x9x22-shaft-22mm-series-a.stl) — Shaft keyseat for 6 × 9 × 22: example shaft ⌀22 mm (top of the series A range 17 to 22 mm) × 44 mm long, circular seat ⌀22 × 6 wide, bottom 6.6 mm (t1, series A) below the top line
- woodruff-key-6x10x25: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x10x25.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x10x25.stl) — Woodruff key 6 × 10 × 25 mm (b × h × d2): width 6, height 10, disc diameter 25; chord 24.49 mm; nominal values, no edge breaks
- woodruff-keyseat-6x10x25-shaft-22mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x10x25-shaft-22mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x10x25-shaft-22mm-series-a.stl) — Shaft keyseat for 6 × 10 × 25: example shaft ⌀22 mm (top of the series A range 17 to 22 mm) × 44 mm long, circular seat ⌀25 × 6 wide, bottom 7.6 mm (t1, series A) below the top line
- woodruff-key-6x11x28: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x11x28.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-6x11x28.stl) — Woodruff key 6 × 11 × 28 mm (b × h × d2): width 6, height 11, disc diameter 28; chord 27.35 mm; nominal values, no edge breaks
- woodruff-keyseat-6x11x28-shaft-38mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x11x28-shaft-38mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-6x11x28-shaft-38mm-series-b.stl) — Shaft keyseat for 6 × 11 × 28: example shaft ⌀38 mm (top of the series B range 30 to 38 mm) × 76 mm long, circular seat ⌀28 × 6 wide, bottom 9.5 mm (t1, series B) below the top line
- woodruff-key-8x9x22: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x9x22.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x9x22.stl) — Woodruff key 8 × 9 × 22 mm (b × h × d2): width 8, height 9, disc diameter 22; chord 21.63 mm; nominal values, no edge breaks
- woodruff-keyseat-8x9x22-shaft-30mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x9x22-shaft-30mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x9x22-shaft-30mm-series-a.stl) — Shaft keyseat for 8 × 9 × 22: example shaft ⌀30 mm (top of the series A range 22 to 30 mm) × 60 mm long, circular seat ⌀22 × 8 wide, bottom 6.2 mm (t1, series A) below the top line
- woodruff-key-8x11x28: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x11x28.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x11x28.stl) — Woodruff key 8 × 11 × 28 mm (b × h × d2): width 8, height 11, disc diameter 28; chord 27.35 mm; nominal values, no edge breaks
- woodruff-keyseat-8x11x28-shaft-30mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x11x28-shaft-30mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x11x28-shaft-30mm-series-a.stl) — Shaft keyseat for 8 × 11 × 28: example shaft ⌀30 mm (top of the series A range 22 to 30 mm) × 60 mm long, circular seat ⌀28 × 8 wide, bottom 8.2 mm (t1, series A) below the top line
- woodruff-key-8x13x32: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x13x32.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-8x13x32.stl) — Woodruff key 8 × 13 × 32 mm (b × h × d2): width 8, height 13, disc diameter 32; chord 31.43 mm; nominal values, no edge breaks
- woodruff-keyseat-8x13x32-shaft-38mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x13x32-shaft-38mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-8x13x32-shaft-38mm-series-b.stl) — Shaft keyseat for 8 × 13 × 32: example shaft ⌀38 mm (top of the series B range 38+ mm) × 76 mm long, circular seat ⌀32 × 8 wide, bottom 11.5 mm (t1, series B) below the top line
- woodruff-key-10x11x28: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x11x28.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x11x28.stl) — Woodruff key 10 × 11 × 28 mm (b × h × d2): width 10, height 11, disc diameter 28; chord 27.35 mm; nominal values, no edge breaks
- woodruff-keyseat-10x11x28-shaft-38mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x11x28-shaft-38mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x11x28-shaft-38mm-series-a.stl) — Shaft keyseat for 10 × 11 × 28: example shaft ⌀38 mm (top of the series A range 30 to 38 mm) × 76 mm long, circular seat ⌀28 × 10 wide, bottom 7.8 mm (t1, series A) below the top line
- woodruff-key-10x13x32: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x13x32.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x13x32.stl) — Woodruff key 10 × 13 × 32 mm (b × h × d2): width 10, height 13, disc diameter 32; chord 31.43 mm; nominal values, no edge breaks
- woodruff-keyseat-10x13x32-shaft-38mm-series-a: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x13x32-shaft-38mm-series-a.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x13x32-shaft-38mm-series-a.stl) — Shaft keyseat for 10 × 13 × 32: example shaft ⌀38 mm (top of the series A range 30 to 38 mm) × 76 mm long, circular seat ⌀32 × 10 wide, bottom 9.8 mm (t1, series A) below the top line
- woodruff-key-10x16x45: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x16x45.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-key-10x16x45.stl) — Woodruff key 10 × 16 × 45 mm (b × h × d2): width 10, height 16, disc diameter 45; chord 43.08 mm; nominal values, no edge breaks
- woodruff-keyseat-10x16x45-shaft-38mm-series-b: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x16x45-shaft-38mm-series-b.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-din-6888/woodruff-keyseat-10x16x45-shaft-38mm-series-b.stl) — Shaft keyseat for 10 × 16 × 45: example shaft ⌀38 mm (top of the series B range 38+ mm) × 76 mm long, circular seat ⌀45 × 10 wide, bottom 14.1 mm (t1, series B) below the top line

## Questions

**What are the dimensions of a 5 × 6.5 × 16 Woodruff key?**

5 mm wide, 6.5 mm tall, 16 mm disc diameter, 15.72 mm long. Shaft seat 4.5 mm deep (series A, shaft 12 to 17 mm) or 5.4 mm (series B, 22 to 30 mm); hub seat 2.2 / 1.3 mm.

**How is the chord length of a Woodruff key found?**

l = 2·√(R² − (R − h)²), R = d2/2: for 5 × 6.5 × 16 that is 2·√(64 − 2.25) = 15.72 mm.

**Which Woodruff keys are in ISO 3912?**

16 of the 24 DIN 6888 sizes: the table marks them.

## Fits with

- [Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key sizes and keyseat depths](https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/)
- [Parallel keys DIN 6885 form A: 2 × 2 to 18 × 11, with keyway depths](https://xemstudio.com/objects/parallel-keys-din-6885/)
- [Square keys, inch (ANSI B17.1): 3/32 to 1/2 in](https://xemstudio.com/objects/square-keys-inch/)
- [Shaft Ø8 × 100 with a 2 × 1 keyway (60 mm)](https://xemstudio.com/objects/keyed-shaft-8x100-key2/)