{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "woodruff-keys-inch-ansi-b17-2",
 "name": "Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key sizes and keyseat depths",
 "kind": "standard",
 "category": "Hardware",
 "group": "Gears, cranks & flywheels",
 "year": null,
 "question": "What are the dimensions of a Woodruff key (#404, #606, #1212) and the keyseat depth in the shaft and hub (ANSI B17.2)?",
 "tags": [
  "woodruff key",
  "half moon key",
  "key",
  "keyseat",
  "shaft",
  "ansi b17.2",
  "standard"
 ],
 "aliases": [
  "woodruff key size chart",
  "#404 woodruff key",
  "woodruff key dimensions",
  "half moon key",
  "woodruff key chart",
  "woodruff keyseat dimensions",
  "keyseat cutter size",
  "woodruff cutter size",
  "woodruff key number",
  "#606 woodruff key",
  "#1210 woodruff key",
  "woodruff key step",
  "woodruff key stl",
  "woodruff key depth",
  "woodruff key shaft depth",
  "ansi b17.2 woodruff"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 41,
 "url": "https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/",
 "sheet_txt": "https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/sheet.txt",
 "sheet": {
  "basis": "ANSI B17.2 tables as published by Engineers Edge, column meanings from AmesWeb, W × B / length / height checked against McMaster-Carr",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "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"
   ],
   "rows": [
    [
     "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"
    ]
   ]
  }
 },
 "sheet_text": "Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key sizes and keyseat depths — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/woodruff-keys-inch-ansi-b17-2/  (sheet CC BY 4.0)\nBasis: ANSI B17.2 tables as published by Engineers Edge, column meanings from AmesWeb, W × B / length / height checked against McMaster-Carr\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n- 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.\n- 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.\n\nkey 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\n202  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\n202.5  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\n302.5  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\n203  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\n303  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\n403  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\n204  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\n304  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\n404  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\n305  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\n405  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\n505  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\n605  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\n406  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\n506  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\n606  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\n806  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\n507  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\n607  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\n707  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\n807  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\n608  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\n708  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\n808  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\n1008  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\n1208  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\n609  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\n709  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\n809  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\n1009  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\n610  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\n710  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\n810  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\n1010  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\n1210  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\n811  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\n1011  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\n1211  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\n812  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\n1012  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\n1212  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\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Engineers Edge: ANSI Standard Woodruff Key Size Table Chart, ANSI B17.2-1967 (R1998) — web — Publisher's page; dimensions are facts — https://host.engineersedge.com/woodruff_keys.htm\n- Engineers Edge: Keyseat dimensions for Woodruff keys (ANSI B17.2) — web — Publisher's page; dimensions are facts — https://ns1.engineersedge.com/hardware/keyseat_dimensions_for_woodruff_keys_15008.htm\n- AmesWeb: Woodruff key sizes and dimensions (ASME B17.2): key number coding, length tolerance — web — Publisher's page; dimensions are facts — https://amesweb.info/Keys/Woodruff-Key-Sizes-Dimensions.aspx\n- AmesWeb: Woodruff keyseat dimensions and tolerances (ASME B17.2): column meanings, tolerances — web — Publisher's page; dimensions are facts — https://amesweb.info/Keys/Woodruff-Keyseat-Dimensions.aspx\n- McMaster-Carr: Woodruff keys: inch key sizes (width, diameter, height, length) and metric sizes — web — Publisher's page; dimensions are facts — https://www.mcmaster.com/keys/key-type~woodruff/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 41 parts): https://xemstudio.com/files/hardware/woodruff-keys-inch-ansi-b17-2/index.json\nAPI: https://xemstudio.com/api/geometry?object=woodruff-keys-inch-ansi-b17-2\n",
 "sources": [
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   "publisher": "Engineers Edge",
   "title": "ANSI Standard Woodruff Key Size Table Chart, ANSI B17.2-1967 (R1998)",
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   "publisher": "Engineers Edge",
   "title": "Keyseat dimensions for Woodruff keys (ANSI B17.2)",
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   "publisher": "AmesWeb",
   "title": "Woodruff key sizes and dimensions (ASME B17.2): key number coding, length tolerance",
   "url": "https://amesweb.info/Keys/Woodruff-Key-Sizes-Dimensions.aspx",
   "formats": [
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   "publisher": "AmesWeb",
   "title": "Woodruff keyseat dimensions and tolerances (ASME B17.2): column meanings, tolerances",
   "url": "https://amesweb.info/Keys/Woodruff-Keyseat-Dimensions.aspx",
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  {
   "publisher": "McMaster-Carr",
   "title": "Woodruff keys: inch key sizes (width, diameter, height, length) and metric sizes",
   "url": "https://www.mcmaster.com/keys/key-type~woodruff/",
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  "square-keys-inch",
  "parallel-keys-din-6885",
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 "mating": [],
 "faq": [
  {
   "q": "What size is a #404 Woodruff key?",
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  },
  {
   "q": "How is a Woodruff key number read?",
   "a": "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."
  },
  {
   "q": "What cutter makes the keyseat?",
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
  },
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   "note": "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"
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   "note": "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"
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   "note": "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"
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   "note": "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"
  },
  {
   "file": "woodruff-key-no-812-1-4x1-1-2",
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   "note": "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"
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  {
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   "note": "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"
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  {
   "file": "woodruff-key-no-1212-3-8x1-1-2",
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   "note": "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"
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