# Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key sizes and keyseat depths

> What are the dimensions of a Woodruff key (#404, #606, #1212) and the keyseat depth in the shaft and hub (ANSI B17.2)?

- Category: Hardware › Gears, cranks & flywheels
- Kind: Standard part
- Basis: ANSI B17.2 tables as published by Engineers Edge, column meanings from AmesWeb, W × B / length / height checked against McMaster-Carr
- Page: https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/ · JSON: https://xemstudio.com/api/geometry?object=woodruff-keys-inch-ansi-b17-2 · Plain text: https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/sheet.txt
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**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- A Woodruff key is a segment of a disc: a round bottom that sits in a seat cut with a woodruff cutter, and a flat top. The key number codes the size: the last two digits are the disc diameter B in eighths of an inch, the digits before them are the width W in thirty-seconds. Key No. 404 is 4/32 × 4/8 = 1/8 × 1/2 in; No. 1212 is 12/32 × 12/8 = 3/8 × 1-1/2 in. Nos. 202.5 and 302.5 carry a half-eighth: 5/16 in diameter.
- Files: for each of the 41 key numbers, one key solid and one example shaft with its keyseat. The key is the part of a disc of diameter B that lies below a flat chord E under the disc centre, so its height is B/2 − E. That reproduces the printed length F (the chord) and the printed height C for all 41 sizes. Two heights are printed (C and D); the files use C. McMaster's listing gives D as the key height; the two differ by at most 0.009 in.
- The seat is a circle of the cutter diameter (modelled at the nominal B; the table gives the cutter range F min – max), the nominal key width wide, with its bottom at the published depth B below the top line of the shaft, measured along the seat centre line. Depth tolerance +.005 / −0. Shaft diameter is not tied to the key in the tables used here, so the example shafts in the files are the same diameter as the key disc; pick the key for your shaft from the maker's selection guidance and treat the example diameter as a placeholder.
- Cross-checks: shaft depth + key above shaft = the minimum key height C; shaft depth + hub depth = the maximum C (to within 0.001 in). Key width, diameter, length and D height of all 41 keys agree with McMaster's key listing. Length tolerance +.000 / −.010 in. Hub seat depth tolerance +.005 / −0; hub width +.002 / −0.
- Left out: the longer keys (Nos. 617 to 2428, 2-1/8 to 3-1/2 in diameter), which only the keyseat table lists, with no key-height table or second source to check them; shaft-diameter ranges per key, which neither source prints; edge chamfers or radii, which the tables do not give.

## Sizes

| key no. | nominal W × B, in | key length F, in | height C max / min, in | height D max / min, in | flat below centre E, in | shaft seat width A min – max, in | shaft seat depth B, in | cutter diameter F min – max, in | key above shaft C, in | hub seat width D, in | hub seat depth E, in |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 202 | 1/16 × 1/4 | 0.248 | 0.109 / 0.104 | 0.109 / 0.104 | 1/64 | 0.0615 – 0.0630 | 0.0728 | 0.250 – 0.268 | 0.0312 | 0.0635 | 0.0372 |
| 202.5 | 1/16 × 5/16 | 0.311 | 0.140 / 0.135 | 0.140 / 0.135 | 1/64 | 0.0615 – 0.0630 | 0.1038 | 0.312 – 0.330 | 0.0312 | 0.0635 | 0.0372 |
| 302.5 | 3/32 × 5/16 | 0.311 | 0.140 / 0.135 | 0.140 / 0.135 | 1/64 | 0.0928 – 0.0943 | 0.0882 | 0.312 – 0.330 | 0.0469 | 0.0948 | 0.0529 |
| 203 | 1/16 × 3/8 | 0.374 | 0.172 / 0.167 | 0.172 / 0.167 | 1/64 | 0.0615 – 0.0630 | 0.1358 | 0.375 – 0.393 | 0.0312 | 0.0635 | 0.0372 |
| 303 | 3/32 × 3/8 | 0.374 | 0.172 / 0.167 | 0.172 / 0.167 | 1/64 | 0.0928 – 0.0943 | 0.1202 | 0.375 – 0.393 | 0.0469 | 0.0948 | 0.0529 |
| 403 | 1/8 × 3/8 | 0.374 | 0.172 / 0.167 | 0.172 / 0.167 | 1/64 | 0.1240 – 0.1255 | 0.1045 | 0.375 – 0.393 | 0.0625 | 0.1260 | 0.0685 |
| 204 | 1/16 × 1/2 | 0.491 | 0.203 / 0.198 | 0.194 / 0.188 | 3/64 | 0.0615 – 0.0630 | 0.1668 | 0.500 – 0.518 | 0.0312 | 0.0635 | 0.0372 |
| 304 | 3/32 × 1/2 | 0.491 | 0.203 / 0.198 | 0.194 / 0.188 | 3/64 | 0.0928 – 0.0943 | 0.1511 | 0.500 – 0.518 | 0.0469 | 0.0948 | 0.0529 |
| 404 | 1/8 × 1/2 | 0.491 | 0.203 / 0.198 | 0.194 / 0.188 | 3/64 | 0.1240 – 0.1255 | 0.1355 | 0.500 – 0.518 | 0.0625 | 0.1260 | 0.0685 |
| 305 | 3/32 × 5/8 | 0.612 | 0.250 / 0.245 | 0.240 / 0.234 | 1/16 | 0.0928 – 0.0943 | 0.1981 | 0.625 – 0.643 | 0.0469 | 0.0948 | 0.0529 |
| 405 | 1/8 × 5/8 | 0.612 | 0.250 / 0.245 | 0.240 / 0.234 | 1/16 | 0.1240 – 0.1255 | 0.1825 | 0.625 – 0.643 | 0.0625 | 0.1260 | 0.0685 |
| 505 | 5/32 × 5/8 | 0.612 | 0.250 / 0.245 | 0.240 / 0.234 | 1/16 | 0.1553 – 0.1568 | 0.1669 | 0.625 – 0.643 | 0.0781 | 0.1573 | 0.0841 |
| 605 | 3/16 × 5/8 | 0.612 | 0.250 / 0.245 | 0.240 / 0.234 | 1/16 | 0.1863 – 0.1880 | 0.1513 | 0.625 – 0.643 | 0.0937 | 0.1885 | 0.0997 |
| 406 | 1/8 × 3/4 | 0.740 | 0.313 / 0.308 | 0.303 / 0.297 | 1/16 | 0.1240 – 0.1255 | 0.2455 | 0.750 – 0.768 | 0.0625 | 0.1260 | 0.0685 |
| 506 | 5/32 × 3/4 | 0.740 | 0.313 / 0.308 | 0.303 / 0.297 | 1/16 | 0.1553 – 0.1568 | 0.2299 | 0.750 – 0.768 | 0.0781 | 0.1573 | 0.0841 |
| 606 | 3/16 × 3/4 | 0.740 | 0.313 / 0.308 | 0.303 / 0.297 | 1/16 | 0.1863 – 0.1880 | 0.2143 | 0.750 – 0.768 | 0.0937 | 0.1885 | 0.0997 |
| 806 | 1/4 × 3/4 | 0.740 | 0.313 / 0.308 | 0.303 / 0.297 | 1/16 | 0.2487 – 0.2505 | 0.1830 | 0.750 – 0.768 | 0.1250 | 0.2510 | 0.1310 |
| 507 | 5/32 × 7/8 | 0.866 | 0.375 / 0.370 | 0.365 / 0.359 | 1/16 | 0.1553 – 0.1568 | 0.2919 | 0.875 – 0.895 | 0.0781 | 0.1573 | 0.0841 |
| 607 | 3/16 × 7/8 | 0.866 | 0.375 / 0.370 | 0.365 / 0.359 | 1/16 | 0.1863 – 0.1880 | 0.2763 | 0.875 – 0.895 | 0.0937 | 0.1885 | 0.0997 |
| 707 | 7/32 × 7/8 | 0.866 | 0.375 / 0.370 | 0.365 / 0.359 | 1/16 | 0.2175 – 0.2193 | 0.2607 | 0.875 – 0.895 | 0.1093 | 0.2198 | 0.1153 |
| 807 | 1/4 × 7/8 | 0.866 | 0.375 / 0.370 | 0.365 / 0.359 | 1/16 | 0.2487 – 0.2505 | 0.2450 | 0.875 – 0.895 | 0.1250 | 0.2510 | 0.1310 |
| 608 | 3/16 × 1 | 0.992 | 0.438 / 0.433 | 0.428 / 0.422 | 1/16 | 0.1863 – 0.1880 | 0.3393 | 1.000 – 1.020 | 0.0937 | 0.1885 | 0.0997 |
| 708 | 7/32 × 1 | 0.992 | 0.438 / 0.433 | 0.428 / 0.422 | 1/16 | 0.2175 – 0.2193 | 0.3237 | 1.000 – 1.020 | 0.1093 | 0.2198 | 0.1153 |
| 808 | 1/4 × 1 | 0.992 | 0.438 / 0.433 | 0.428 / 0.422 | 1/16 | 0.2487 – 0.2505 | 0.3080 | 1.000 – 1.020 | 0.1250 | 0.2510 | 0.1310 |
| 1008 | 5/16 × 1 | 0.992 | 0.438 / 0.433 | 0.428 / 0.422 | 1/16 | 0.3111 – 0.3130 | 0.2768 | 1.000 – 1.020 | 0.1562 | 0.3135 | 0.1622 |
| 1208 | 3/8 × 1 | 0.992 | 0.438 / 0.433 | 0.428 / 0.422 | 1/16 | 0.3735 – 0.3755 | 0.2455 | 1.000 – 1.020 | 0.1875 | 0.3760 | 0.1935 |
| 609 | 3/16 × 1-1/8 | 1.114 | 0.484 / 0.479 | 0.475 / 0.469 | 5/64 | 0.1863 – 0.1880 | 0.3853 | 1.125 – 1.145 | 0.0937 | 0.1885 | 0.0997 |
| 709 | 7/32 × 1-1/8 | 1.114 | 0.484 / 0.479 | 0.475 / 0.469 | 5/64 | 0.2175 – 0.2193 | 0.3697 | 1.125 – 1.145 | 0.1093 | 0.2198 | 0.1153 |
| 809 | 1/4 × 1-1/8 | 1.114 | 0.484 / 0.479 | 0.475 / 0.469 | 5/64 | 0.2487 – 0.2505 | 0.3540 | 1.125 – 1.145 | 0.1250 | 0.2510 | 0.1310 |
| 1009 | 5/16 × 1-1/8 | 1.114 | 0.484 / 0.479 | 0.475 / 0.469 | 5/64 | 0.3111 – 0.3130 | 0.3228 | 1.125 – 1.145 | 0.1562 | 0.3135 | 0.1622 |
| 610 | 3/16 × 1-1/4 | 1.240 | 0.547 / 0.542 | 0.537 / 0.531 | 5/64 | 0.1863 – 0.1880 | 0.4483 | 1.250 – 1.273 | 0.0937 | 0.1885 | 0.0997 |
| 710 | 7/32 × 1-1/4 | 1.240 | 0.547 / 0.542 | 0.537 / 0.531 | 5/64 | 0.2175 – 0.2193 | 0.4327 | 1.250 – 1.273 | 0.1093 | 0.2198 | 0.1153 |
| 810 | 1/4 × 1-1/4 | 1.240 | 0.547 / 0.542 | 0.537 / 0.531 | 5/64 | 0.2487 – 0.2505 | 0.4170 | 1.250 – 1.273 | 0.1250 | 0.2510 | 0.1310 |
| 1010 | 5/16 × 1-1/4 | 1.240 | 0.547 / 0.542 | 0.537 / 0.531 | 5/64 | 0.3111 – 0.3130 | 0.3858 | 1.250 – 1.273 | 0.1562 | 0.3135 | 0.1622 |
| 1210 | 3/8 × 1-1/4 | 1.240 | 0.547 / 0.542 | 0.537 / 0.531 | 5/64 | 0.3735 – 0.3755 | 0.3545 | 1.250 – 1.273 | 0.1875 | 0.3760 | 0.1935 |
| 811 | 1/4 × 1-3/8 | 1.362 | 0.594 / 0.589 | 0.584 / 0.578 | 3/32 | 0.2487 – 0.2505 | 0.4640 | 1.375 – 1.398 | 0.1250 | 0.2510 | 0.1310 |
| 1011 | 5/16 × 1-3/8 | 1.362 | 0.594 / 0.589 | 0.584 / 0.578 | 3/32 | 0.3111 – 0.3130 | 0.4328 | 1.375 – 1.398 | 0.1562 | 0.3135 | 0.1622 |
| 1211 | 3/8 × 1-3/8 | 1.362 | 0.594 / 0.589 | 0.584 / 0.578 | 3/32 | 0.3735 – 0.3755 | 0.4015 | 1.375 – 1.398 | 0.1875 | 0.3760 | 0.1935 |
| 812 | 1/4 × 1-1/2 | 1.484 | 0.641 / 0.636 | 0.631 / 0.625 | 7/64 | 0.2487 – 0.2505 | 0.5110 | 1.500 – 1.523 | 0.1250 | 0.2510 | 0.1310 |
| 1012 | 5/16 × 1-1/2 | 1.484 | 0.641 / 0.636 | 0.631 / 0.625 | 7/64 | 0.3111 – 0.3130 | 0.4798 | 1.500 – 1.523 | 0.1562 | 0.3135 | 0.1622 |
| 1212 | 3/8 × 1-1/2 | 1.484 | 0.641 / 0.636 | 0.631 / 0.625 | 7/64 | 0.3735 – 0.3755 | 0.4485 | 1.500 – 1.523 | 0.1875 | 0.3760 | 0.1935 |

## Where the files are

- Engineers Edge: [ANSI Standard Woodruff Key Size Table Chart, ANSI B17.2-1967 (R1998)](https://host.engineersedge.com/woodruff_keys.htm) — web — Publisher's page; dimensions are facts
- Engineers Edge: [Keyseat dimensions for Woodruff keys (ANSI B17.2)](https://ns1.engineersedge.com/hardware/keyseat_dimensions_for_woodruff_keys_15008.htm) — web — Publisher's page; dimensions are facts
- AmesWeb: [Woodruff key sizes and dimensions (ASME B17.2): key number coding, length tolerance](https://amesweb.info/Keys/Woodruff-Key-Sizes-Dimensions.aspx) — web — Publisher's page; dimensions are facts
- AmesWeb: [Woodruff keyseat dimensions and tolerances (ASME B17.2): column meanings, tolerances](https://amesweb.info/Keys/Woodruff-Keyseat-Dimensions.aspx) — 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 (41 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/index.json

- woodruff-key-no-202-1-16x1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-202-1-16x1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-202-1-16x1-4.stl) — Key No. 202: 1/16 × 1/4 in disc segment (1.59 mm thick, 6.35 mm diameter), height 2.78 mm (= radius minus the 1/64 in flat offset), chord 6.30 mm; nominal values, no edge breaks
- woodruff-key-no-202-5-1-16x5-16: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-202-5-1-16x5-16.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-202-5-1-16x5-16.stl) — Key No. 202.5: 1/16 × 5/16 in disc segment (1.59 mm thick, 7.94 mm diameter), height 3.57 mm (= radius minus the 1/64 in flat offset), chord 7.90 mm; nominal values, no edge breaks
- woodruff-key-no-302-5-3-32x5-16: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-302-5-3-32x5-16.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-302-5-3-32x5-16.stl) — Key No. 302.5: 3/32 × 5/16 in disc segment (2.38 mm thick, 7.94 mm diameter), height 3.57 mm (= radius minus the 1/64 in flat offset), chord 7.90 mm; nominal values, no edge breaks
- woodruff-key-no-203-1-16x3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-203-1-16x3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-203-1-16x3-8.stl) — Key No. 203: 1/16 × 3/8 in disc segment (1.59 mm thick, 9.52 mm diameter), height 4.37 mm (= radius minus the 1/64 in flat offset), chord 9.49 mm; nominal values, no edge breaks
- woodruff-key-no-303-3-32x3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-303-3-32x3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-303-3-32x3-8.stl) — Key No. 303: 3/32 × 3/8 in disc segment (2.38 mm thick, 9.52 mm diameter), height 4.37 mm (= radius minus the 1/64 in flat offset), chord 9.49 mm; nominal values, no edge breaks
- woodruff-key-no-403-1-8x3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-403-1-8x3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-403-1-8x3-8.stl) — Key No. 403: 1/8 × 3/8 in disc segment (3.17 mm thick, 9.52 mm diameter), height 4.37 mm (= radius minus the 1/64 in flat offset), chord 9.49 mm; nominal values, no edge breaks
- woodruff-key-no-204-1-16x1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-204-1-16x1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-204-1-16x1-2.stl) — Key No. 204: 1/16 × 1/2 in disc segment (1.59 mm thick, 12.70 mm diameter), height 5.16 mm (= radius minus the 3/64 in flat offset), chord 12.47 mm; nominal values, no edge breaks
- woodruff-key-no-304-3-32x1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-304-3-32x1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-304-3-32x1-2.stl) — Key No. 304: 3/32 × 1/2 in disc segment (2.38 mm thick, 12.70 mm diameter), height 5.16 mm (= radius minus the 3/64 in flat offset), chord 12.47 mm; nominal values, no edge breaks
- woodruff-key-no-404-1-8x1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-404-1-8x1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-404-1-8x1-2.stl) — Key No. 404: 1/8 × 1/2 in disc segment (3.17 mm thick, 12.70 mm diameter), height 5.16 mm (= radius minus the 3/64 in flat offset), chord 12.47 mm; nominal values, no edge breaks
- woodruff-key-no-305-3-32x5-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-305-3-32x5-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-305-3-32x5-8.stl) — Key No. 305: 3/32 × 5/8 in disc segment (2.38 mm thick, 15.88 mm diameter), height 6.35 mm (= radius minus the 1/16 in flat offset), chord 15.55 mm; nominal values, no edge breaks
- woodruff-key-no-405-1-8x5-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-405-1-8x5-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-405-1-8x5-8.stl) — Key No. 405: 1/8 × 5/8 in disc segment (3.17 mm thick, 15.88 mm diameter), height 6.35 mm (= radius minus the 1/16 in flat offset), chord 15.55 mm; nominal values, no edge breaks
- woodruff-key-no-505-5-32x5-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-505-5-32x5-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-505-5-32x5-8.stl) — Key No. 505: 5/32 × 5/8 in disc segment (3.97 mm thick, 15.88 mm diameter), height 6.35 mm (= radius minus the 1/16 in flat offset), chord 15.55 mm; nominal values, no edge breaks
- woodruff-key-no-605-3-16x5-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-605-3-16x5-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-605-3-16x5-8.stl) — Key No. 605: 3/16 × 5/8 in disc segment (4.76 mm thick, 15.88 mm diameter), height 6.35 mm (= radius minus the 1/16 in flat offset), chord 15.55 mm; nominal values, no edge breaks
- woodruff-key-no-406-1-8x3-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-406-1-8x3-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-406-1-8x3-4.stl) — Key No. 406: 1/8 × 3/4 in disc segment (3.17 mm thick, 19.05 mm diameter), height 7.94 mm (= radius minus the 1/16 in flat offset), chord 18.78 mm; nominal values, no edge breaks
- woodruff-key-no-506-5-32x3-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-506-5-32x3-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-506-5-32x3-4.stl) — Key No. 506: 5/32 × 3/4 in disc segment (3.97 mm thick, 19.05 mm diameter), height 7.94 mm (= radius minus the 1/16 in flat offset), chord 18.78 mm; nominal values, no edge breaks
- woodruff-key-no-606-3-16x3-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-606-3-16x3-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-606-3-16x3-4.stl) — Key No. 606: 3/16 × 3/4 in disc segment (4.76 mm thick, 19.05 mm diameter), height 7.94 mm (= radius minus the 1/16 in flat offset), chord 18.78 mm; nominal values, no edge breaks
- woodruff-key-no-806-1-4x3-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-806-1-4x3-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-806-1-4x3-4.stl) — Key No. 806: 1/4 × 3/4 in disc segment (6.35 mm thick, 19.05 mm diameter), height 7.94 mm (= radius minus the 1/16 in flat offset), chord 18.78 mm; nominal values, no edge breaks
- woodruff-key-no-507-5-32x7-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-507-5-32x7-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-507-5-32x7-8.stl) — Key No. 507: 5/32 × 7/8 in disc segment (3.97 mm thick, 22.22 mm diameter), height 9.52 mm (= radius minus the 1/16 in flat offset), chord 22.00 mm; nominal values, no edge breaks
- woodruff-key-no-607-3-16x7-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-607-3-16x7-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-607-3-16x7-8.stl) — Key No. 607: 3/16 × 7/8 in disc segment (4.76 mm thick, 22.22 mm diameter), height 9.52 mm (= radius minus the 1/16 in flat offset), chord 22.00 mm; nominal values, no edge breaks
- woodruff-key-no-707-7-32x7-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-707-7-32x7-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-707-7-32x7-8.stl) — Key No. 707: 7/32 × 7/8 in disc segment (5.56 mm thick, 22.22 mm diameter), height 9.52 mm (= radius minus the 1/16 in flat offset), chord 22.00 mm; nominal values, no edge breaks
- woodruff-key-no-807-1-4x7-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-807-1-4x7-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-807-1-4x7-8.stl) — Key No. 807: 1/4 × 7/8 in disc segment (6.35 mm thick, 22.22 mm diameter), height 9.52 mm (= radius minus the 1/16 in flat offset), chord 22.00 mm; nominal values, no edge breaks
- woodruff-key-no-608-3-16x1: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-608-3-16x1.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-608-3-16x1.stl) — Key No. 608: 3/16 × 1 in disc segment (4.76 mm thick, 25.40 mm diameter), height 11.11 mm (= radius minus the 1/16 in flat offset), chord 25.20 mm; nominal values, no edge breaks
- woodruff-key-no-708-7-32x1: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-708-7-32x1.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-708-7-32x1.stl) — Key No. 708: 7/32 × 1 in disc segment (5.56 mm thick, 25.40 mm diameter), height 11.11 mm (= radius minus the 1/16 in flat offset), chord 25.20 mm; nominal values, no edge breaks
- woodruff-key-no-808-1-4x1: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-808-1-4x1.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-808-1-4x1.stl) — Key No. 808: 1/4 × 1 in disc segment (6.35 mm thick, 25.40 mm diameter), height 11.11 mm (= radius minus the 1/16 in flat offset), chord 25.20 mm; nominal values, no edge breaks
- woodruff-key-no-1008-5-16x1: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1008-5-16x1.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1008-5-16x1.stl) — Key No. 1008: 5/16 × 1 in disc segment (7.94 mm thick, 25.40 mm diameter), height 11.11 mm (= radius minus the 1/16 in flat offset), chord 25.20 mm; nominal values, no edge breaks
- woodruff-key-no-1208-3-8x1: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1208-3-8x1.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1208-3-8x1.stl) — Key No. 1208: 3/8 × 1 in disc segment (9.52 mm thick, 25.40 mm diameter), height 11.11 mm (= radius minus the 1/16 in flat offset), chord 25.20 mm; nominal values, no edge breaks
- woodruff-key-no-609-3-16x1-1-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-609-3-16x1-1-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-609-3-16x1-1-8.stl) — Key No. 609: 3/16 × 1-1/8 in disc segment (4.76 mm thick, 28.57 mm diameter), height 12.30 mm (= radius minus the 5/64 in flat offset), chord 28.30 mm; nominal values, no edge breaks
- woodruff-key-no-709-7-32x1-1-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-709-7-32x1-1-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-709-7-32x1-1-8.stl) — Key No. 709: 7/32 × 1-1/8 in disc segment (5.56 mm thick, 28.57 mm diameter), height 12.30 mm (= radius minus the 5/64 in flat offset), chord 28.30 mm; nominal values, no edge breaks
- woodruff-key-no-809-1-4x1-1-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-809-1-4x1-1-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-809-1-4x1-1-8.stl) — Key No. 809: 1/4 × 1-1/8 in disc segment (6.35 mm thick, 28.57 mm diameter), height 12.30 mm (= radius minus the 5/64 in flat offset), chord 28.30 mm; nominal values, no edge breaks
- woodruff-key-no-1009-5-16x1-1-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1009-5-16x1-1-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1009-5-16x1-1-8.stl) — Key No. 1009: 5/16 × 1-1/8 in disc segment (7.94 mm thick, 28.57 mm diameter), height 12.30 mm (= radius minus the 5/64 in flat offset), chord 28.30 mm; nominal values, no edge breaks
- woodruff-key-no-610-3-16x1-1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-610-3-16x1-1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-610-3-16x1-1-4.stl) — Key No. 610: 3/16 × 1-1/4 in disc segment (4.76 mm thick, 31.75 mm diameter), height 13.89 mm (= radius minus the 5/64 in flat offset), chord 31.50 mm; nominal values, no edge breaks
- woodruff-key-no-710-7-32x1-1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-710-7-32x1-1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-710-7-32x1-1-4.stl) — Key No. 710: 7/32 × 1-1/4 in disc segment (5.56 mm thick, 31.75 mm diameter), height 13.89 mm (= radius minus the 5/64 in flat offset), chord 31.50 mm; nominal values, no edge breaks
- woodruff-key-no-810-1-4x1-1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-810-1-4x1-1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-810-1-4x1-1-4.stl) — Key No. 810: 1/4 × 1-1/4 in disc segment (6.35 mm thick, 31.75 mm diameter), height 13.89 mm (= radius minus the 5/64 in flat offset), chord 31.50 mm; nominal values, no edge breaks
- woodruff-key-no-1010-5-16x1-1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1010-5-16x1-1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1010-5-16x1-1-4.stl) — Key No. 1010: 5/16 × 1-1/4 in disc segment (7.94 mm thick, 31.75 mm diameter), height 13.89 mm (= radius minus the 5/64 in flat offset), chord 31.50 mm; nominal values, no edge breaks
- woodruff-key-no-1210-3-8x1-1-4: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1210-3-8x1-1-4.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1210-3-8x1-1-4.stl) — Key No. 1210: 3/8 × 1-1/4 in disc segment (9.52 mm thick, 31.75 mm diameter), height 13.89 mm (= radius minus the 5/64 in flat offset), chord 31.50 mm; nominal values, no edge breaks
- woodruff-key-no-811-1-4x1-3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-811-1-4x1-3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-811-1-4x1-3-8.stl) — Key No. 811: 1/4 × 1-3/8 in disc segment (6.35 mm thick, 34.92 mm diameter), height 15.08 mm (= radius minus the 3/32 in flat offset), chord 34.60 mm; nominal values, no edge breaks
- woodruff-key-no-1011-5-16x1-3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1011-5-16x1-3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1011-5-16x1-3-8.stl) — Key No. 1011: 5/16 × 1-3/8 in disc segment (7.94 mm thick, 34.92 mm diameter), height 15.08 mm (= radius minus the 3/32 in flat offset), chord 34.60 mm; nominal values, no edge breaks
- woodruff-key-no-1211-3-8x1-3-8: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1211-3-8x1-3-8.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1211-3-8x1-3-8.stl) — Key No. 1211: 3/8 × 1-3/8 in disc segment (9.52 mm thick, 34.92 mm diameter), height 15.08 mm (= radius minus the 3/32 in flat offset), chord 34.60 mm; nominal values, no edge breaks
- woodruff-key-no-812-1-4x1-1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-812-1-4x1-1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-812-1-4x1-1-2.stl) — Key No. 812: 1/4 × 1-1/2 in disc segment (6.35 mm thick, 38.10 mm diameter), height 16.27 mm (= radius minus the 7/64 in flat offset), chord 37.69 mm; nominal values, no edge breaks
- woodruff-key-no-1012-5-16x1-1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1012-5-16x1-1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1012-5-16x1-1-2.stl) — Key No. 1012: 5/16 × 1-1/2 in disc segment (7.94 mm thick, 38.10 mm diameter), height 16.27 mm (= radius minus the 7/64 in flat offset), chord 37.69 mm; nominal values, no edge breaks
- woodruff-key-no-1212-3-8x1-1-2: [STEP](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1212-3-8x1-1-2.step) · [STL](https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/woodruff-key-no-1212-3-8x1-1-2.stl) — Key No. 1212: 3/8 × 1-1/2 in disc segment (9.52 mm thick, 38.10 mm diameter), height 16.27 mm (= radius minus the 7/64 in flat offset), chord 37.69 mm; nominal values, no edge breaks

## Questions

**What size is a #404 Woodruff key?**

1/8 × 1/2 in: 1/8 in wide, 1/2 in diameter, 0.491 in long, 0.203 in tall (C). The shaft seat is 0.1355 in deep and the hub seat 0.0685 in.

**How is a Woodruff key number read?**

The last two digits are the diameter in eighths of an inch, the digits before them the width in thirty-seconds: No. 1212 = 12/32 × 12/8 = 3/8 × 1-1/2 in.

**What cutter makes the keyseat?**

A woodruff keyseat cutter of the key's nominal diameter B (the table gives cutter diameter F as B to B + 0.018 to 0.035 in) and the key's width.

## Fits with

- [Woodruff keys, metric (DIN 6888 / ISO 3912): b × h × d2, keyseat depths t1 and t2, shaft ranges](https://xemstudio.com/objects/woodruff-keys-din-6888/)
- [Square keys, inch (ANSI B17.1): 3/32 to 1/2 in](https://xemstudio.com/objects/square-keys-inch/)
- [Parallel keys DIN 6885 form A: 2 × 2 to 18 × 11, with keyway depths](https://xemstudio.com/objects/parallel-keys-din-6885/)
- [Shaft Ø8 × 100 with a 2 × 1 keyway (60 mm)](https://xemstudio.com/objects/keyed-shaft-8x100-key2/)