{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "spur-gears-module-0-8",
 "name": "Spur gears, module 0.8: 10 to 80 teeth (20° involute)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What is the pitch diameter of a module 0.8 spur gear?",
 "tags": [
  "gear",
  "spur gear",
  "module 0.8",
  "involute"
 ],
 "aliases": [
  "module 0.8 spur gear stl",
  "m0.8 gear dimensions",
  "spur gear calculator pitch diameter",
  "involute gear step file",
  "3d printable gear"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 26,
 "url": "https://xemstudio.com/objects/spur-gears-module-0-8/",
 "sheet_txt": "https://xemstudio.com/objects/spur-gears-module-0-8/sheet.txt",
 "sheet": {
  "basis": "ISO 53 basic rack: 20° pressure angle, addendum m, dedendum 1.25 m; pitch Ø = m × teeth, tip Ø = m × (teeth + 2), root Ø = m × (teeth − 2.5)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Centre distance of two module 0.8 gears = m × (N1 + N2) / 2. Face width 6.4 mm, plain bore (add a hub, key or set screw to suit). Teeth below 17 are drawn without profile shift, so they undercut as real unshifted gears do."
  ],
  "table": {
   "columns": [
    "teeth",
    "pitch_dia_mm",
    "tip_dia_mm",
    "root_dia_mm",
    "face_mm",
    "bore_mm"
   ],
   "rows": [
    [
     10,
     8,
     9.6,
     6,
     6.4,
     2
    ],
    [
     12,
     9.6,
     11.2,
     7.6,
     6.4,
     3
    ],
    [
     14,
     11.2,
     12.8,
     9.2,
     6.4,
     3
    ],
    [
     15,
     12,
     13.6,
     10,
     6.4,
     4
    ],
    [
     16,
     12.8,
     14.4,
     10.8,
     6.4,
     4
    ],
    [
     18,
     14.4,
     16,
     12.4,
     6.4,
     4
    ],
    [
     20,
     16,
     17.6,
     14,
     6.4,
     5
    ],
    [
     22,
     17.6,
     19.2,
     15.6,
     6.4,
     5
    ],
    [
     24,
     19.2,
     20.8,
     17.2,
     6.4,
     6
    ],
    [
     25,
     20,
     21.6,
     18,
     6.4,
     6
    ],
    [
     28,
     22.4,
     24,
     20.4,
     6.4,
     7
    ],
    [
     30,
     24,
     25.6,
     22,
     6.4,
     8
    ],
    [
     32,
     25.6,
     27.2,
     23.6,
     6.4,
     8
    ],
    [
     35,
     28,
     29.6,
     26,
     6.4,
     9
    ],
    [
     36,
     28.8,
     30.4,
     26.8,
     6.4,
     9
    ],
    [
     40,
     32,
     33.6,
     30,
     6.4,
     10
    ],
    [
     42,
     33.6,
     35.2,
     31.6,
     6.4,
     11
    ],
    [
     45,
     36,
     37.6,
     34,
     6.4,
     12
    ],
    [
     48,
     38.4,
     40,
     36.4,
     6.4,
     13
    ],
    [
     50,
     40,
     41.6,
     38,
     6.4,
     13
    ],
    [
     56,
     44.8,
     46.4,
     42.8,
     6.4,
     15
    ],
    [
     60,
     48,
     49.6,
     46,
     6.4,
     16
    ],
    [
     64,
     51.2,
     52.8,
     49.2,
     6.4,
     17
    ],
    [
     70,
     56,
     57.6,
     54,
     6.4,
     19
    ],
    [
     72,
     57.6,
     59.2,
     55.6,
     6.4,
     19
    ],
    [
     80,
     64,
     65.6,
     62,
     6.4,
     22
    ]
   ]
  }
 },
 "sheet_text": "Spur gears, module 0.8: 10 to 80 teeth (20° involute) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/spur-gears-module-0-8/  (CC BY 4.0)\nBasis: ISO 53 basic rack: 20° pressure angle, addendum m, dedendum 1.25 m; pitch Ø = m × teeth, tip Ø = m × (teeth + 2), root Ø = m × (teeth − 2.5)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Centre distance of two module 0.8 gears = m × (N1 + N2) / 2. Face width 6.4 mm, plain bore (add a hub, key or set screw to suit). Teeth below 17 are drawn without profile shift, so they undercut as real unshifted gears do.\n\nteeth  pitch_dia_mm  tip_dia_mm  root_dia_mm  face_mm  bore_mm\n10  8.0  9.6  6.0  6.4  2.0\n12  9.6  11.2  7.6  6.4  3\n14  11.2  12.8  9.2  6.4  3\n15  12.0  13.6  10.0  6.4  4\n16  12.8  14.4  10.8  6.4  4\n18  14.4  16.0  12.4  6.4  4\n20  16.0  17.6  14.0  6.4  5\n22  17.6  19.2  15.6  6.4  5\n24  19.2  20.8  17.2  6.4  6\n25  20.0  21.6  18.0  6.4  6\n28  22.4  24.0  20.4  6.4  7\n30  24.0  25.6  22.0  6.4  8\n32  25.6  27.2  23.6  6.4  8\n35  28.0  29.6  26.0  6.4  9\n36  28.8  30.4  26.8  6.4  9\n40  32.0  33.6  30.0  6.4  10\n42  33.6  35.2  31.6  6.4  11\n45  36.0  37.6  34.0  6.4  12\n48  38.4  40.0  36.4  6.4  13\n50  40.0  41.6  38.0  6.4  13\n56  44.8  46.4  42.8  6.4  15\n60  48.0  49.6  46.0  6.4  16\n64  51.2  52.8  49.2  6.4  17\n70  56.0  57.6  54.0  6.4  19\n72  57.6  59.2  55.6  6.4  19\n80  64.0  65.6  62.0  6.4  22\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO: ISO 53 standard basic rack (20° pressure angle, addendum 1 m, dedendum 1.25 m) and ISO 54 modules — standard — ISO; dimensions are facts [verify license at link] — https://www.iso.org/standard/5768.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 26 parts): https://xemstudio.com/files/hardware/spur-gears-module-0-8/index.json\nAPI: https://xemstudio.com/api/geometry?object=spur-gears-module-0-8\n",
 "sources": [
  {
   "publisher": "ISO",
   "title": "ISO 53 standard basic rack (20° pressure angle, addendum 1 m, dedendum 1.25 m) and ISO 54 modules",
   "url": "https://www.iso.org/standard/5768.html",
   "formats": [
    "standard"
   ],
   "license": "ISO; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "spur-gears-module-0-5",
  "spur-gears-module-1",
  "spur-gears-module-1-25",
  "spur-gears-module-1-5",
  "spur-gears-module-2",
  "spur-gears-involute"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "Pitch diameter of a module 0.8, 20-tooth gear?",
   "a": "16 mm; tip 17.6 mm."
  },
  {
   "q": "Centre distance?",
   "a": "m × (N1 + N2) / 2: a 20 and a 40 tooth module 0.8 pair sit 24 mm apart."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "gear-m0-8-10t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-10t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-10t.stl",
   "note": "module 0.8, 10 teeth: pitch Ø8, tip Ø9.6, root Ø6, face 6.4, bore Ø2"
  },
  {
   "file": "gear-m0-8-12t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-12t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-12t.stl",
   "note": "module 0.8, 12 teeth: pitch Ø9.6, tip Ø11.2, root Ø7.6, face 6.4, bore Ø3"
  },
  {
   "file": "gear-m0-8-14t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-14t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-14t.stl",
   "note": "module 0.8, 14 teeth: pitch Ø11.2, tip Ø12.8, root Ø9.2, face 6.4, bore Ø3"
  },
  {
   "file": "gear-m0-8-15t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-15t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-15t.stl",
   "note": "module 0.8, 15 teeth: pitch Ø12, tip Ø13.6, root Ø10, face 6.4, bore Ø4"
  },
  {
   "file": "gear-m0-8-16t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-16t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-16t.stl",
   "note": "module 0.8, 16 teeth: pitch Ø12.8, tip Ø14.4, root Ø10.8, face 6.4, bore Ø4"
  },
  {
   "file": "gear-m0-8-18t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-18t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-18t.stl",
   "note": "module 0.8, 18 teeth: pitch Ø14.4, tip Ø16, root Ø12.4, face 6.4, bore Ø4"
  },
  {
   "file": "gear-m0-8-20t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-20t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-20t.stl",
   "note": "module 0.8, 20 teeth: pitch Ø16, tip Ø17.6, root Ø14, face 6.4, bore Ø5"
  },
  {
   "file": "gear-m0-8-22t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-22t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-22t.stl",
   "note": "module 0.8, 22 teeth: pitch Ø17.6, tip Ø19.2, root Ø15.6, face 6.4, bore Ø5"
  },
  {
   "file": "gear-m0-8-24t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-24t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-24t.stl",
   "note": "module 0.8, 24 teeth: pitch Ø19.2, tip Ø20.8, root Ø17.2, face 6.4, bore Ø6"
  },
  {
   "file": "gear-m0-8-25t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-25t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-25t.stl",
   "note": "module 0.8, 25 teeth: pitch Ø20, tip Ø21.6, root Ø18, face 6.4, bore Ø6"
  },
  {
   "file": "gear-m0-8-28t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-28t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-28t.stl",
   "note": "module 0.8, 28 teeth: pitch Ø22.4, tip Ø24, root Ø20.4, face 6.4, bore Ø7"
  },
  {
   "file": "gear-m0-8-30t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-30t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-30t.stl",
   "note": "module 0.8, 30 teeth: pitch Ø24, tip Ø25.6, root Ø22, face 6.4, bore Ø8"
  },
  {
   "file": "gear-m0-8-32t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-32t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-32t.stl",
   "note": "module 0.8, 32 teeth: pitch Ø25.6, tip Ø27.2, root Ø23.6, face 6.4, bore Ø8"
  },
  {
   "file": "gear-m0-8-35t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-35t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-35t.stl",
   "note": "module 0.8, 35 teeth: pitch Ø28, tip Ø29.6, root Ø26, face 6.4, bore Ø9"
  },
  {
   "file": "gear-m0-8-36t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-36t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-36t.stl",
   "note": "module 0.8, 36 teeth: pitch Ø28.8, tip Ø30.4, root Ø26.8, face 6.4, bore Ø9"
  },
  {
   "file": "gear-m0-8-40t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-40t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-40t.stl",
   "note": "module 0.8, 40 teeth: pitch Ø32, tip Ø33.6, root Ø30, face 6.4, bore Ø10"
  },
  {
   "file": "gear-m0-8-42t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-42t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-42t.stl",
   "note": "module 0.8, 42 teeth: pitch Ø33.6, tip Ø35.2, root Ø31.6, face 6.4, bore Ø11"
  },
  {
   "file": "gear-m0-8-45t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-45t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-45t.stl",
   "note": "module 0.8, 45 teeth: pitch Ø36, tip Ø37.6, root Ø34, face 6.4, bore Ø12"
  },
  {
   "file": "gear-m0-8-48t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-48t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-48t.stl",
   "note": "module 0.8, 48 teeth: pitch Ø38.4, tip Ø40, root Ø36.4, face 6.4, bore Ø13"
  },
  {
   "file": "gear-m0-8-50t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-50t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-50t.stl",
   "note": "module 0.8, 50 teeth: pitch Ø40, tip Ø41.6, root Ø38, face 6.4, bore Ø13"
  },
  {
   "file": "gear-m0-8-56t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-56t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-56t.stl",
   "note": "module 0.8, 56 teeth: pitch Ø44.8, tip Ø46.4, root Ø42.8, face 6.4, bore Ø15"
  },
  {
   "file": "gear-m0-8-60t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-60t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-60t.stl",
   "note": "module 0.8, 60 teeth: pitch Ø48, tip Ø49.6, root Ø46, face 6.4, bore Ø16"
  },
  {
   "file": "gear-m0-8-64t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-64t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-64t.stl",
   "note": "module 0.8, 64 teeth: pitch Ø51.2, tip Ø52.8, root Ø49.2, face 6.4, bore Ø17"
  },
  {
   "file": "gear-m0-8-70t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-70t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-70t.stl",
   "note": "module 0.8, 70 teeth: pitch Ø56, tip Ø57.6, root Ø54, face 6.4, bore Ø19"
  },
  {
   "file": "gear-m0-8-72t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-72t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-72t.stl",
   "note": "module 0.8, 72 teeth: pitch Ø57.6, tip Ø59.2, root Ø55.6, face 6.4, bore Ø19"
  },
  {
   "file": "gear-m0-8-80t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-80t.step",
   "stl": "https://xemstudio.com/files/hardware/spur-gears-module-0-8/gear-m0-8-80t.stl",
   "note": "module 0.8, 80 teeth: pitch Ø64, tip Ø65.6, root Ø62, face 6.4, bore Ø22"
  }
 ],
 "markdown": "https://xemstudio.com/objects/spur-gears-module-0-8/index.md"
}