Xem Studiomeasured geometrySpur gears, module 0.8: 10 to 80 teeth (20° involute)
What is the pitch diameter of a module 0.8 spur gear? · Hardware · 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)
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 26 in table
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.
Sizes
| teeth | pitch_dia_mm | tip_dia_mm | root_dia_mm | face_mm | bore_mm |
|---|---|---|---|---|---|
| 10 | 8.0 | 9.6 | 6.0 | 6.4 | 2.0 |
| 12 | 9.6 | 11.2 | 7.6 | 6.4 | 3 |
| 14 | 11.2 | 12.8 | 9.2 | 6.4 | 3 |
| 15 | 12.0 | 13.6 | 10.0 | 6.4 | 4 |
| 16 | 12.8 | 14.4 | 10.8 | 6.4 | 4 |
| 18 | 14.4 | 16.0 | 12.4 | 6.4 | 4 |
| 20 | 16.0 | 17.6 | 14.0 | 6.4 | 5 |
| 22 | 17.6 | 19.2 | 15.6 | 6.4 | 5 |
| 24 | 19.2 | 20.8 | 17.2 | 6.4 | 6 |
| 25 | 20.0 | 21.6 | 18.0 | 6.4 | 6 |
| 28 | 22.4 | 24.0 | 20.4 | 6.4 | 7 |
| 30 | 24.0 | 25.6 | 22.0 | 6.4 | 8 |
| 32 | 25.6 | 27.2 | 23.6 | 6.4 | 8 |
| 35 | 28.0 | 29.6 | 26.0 | 6.4 | 9 |
| 36 | 28.8 | 30.4 | 26.8 | 6.4 | 9 |
| 40 | 32.0 | 33.6 | 30.0 | 6.4 | 10 |
| 42 | 33.6 | 35.2 | 31.6 | 6.4 | 11 |
| 45 | 36.0 | 37.6 | 34.0 | 6.4 | 12 |
| 48 | 38.4 | 40.0 | 36.4 | 6.4 | 13 |
| 50 | 40.0 | 41.6 | 38.0 | 6.4 | 13 |
| 56 | 44.8 | 46.4 | 42.8 | 6.4 | 15 |
| 60 | 48.0 | 49.6 | 46.0 | 6.4 | 16 |
| 64 | 51.2 | 52.8 | 49.2 | 6.4 | 17 |
| 70 | 56.0 | 57.6 | 54.0 | 6.4 | 19 |
| 72 | 57.6 | 59.2 | 55.6 | 6.4 | 19 |
| 80 | 64.0 | 65.6 | 62.0 | 6.4 | 22 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| 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 |
Free files
★ Free files 26 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| gear-m0-8-10t | module 0.8, 10 teeth: pitch Ø8, tip Ø9.6, root Ø6, face 6.4, bore Ø2 | STEP · STL |
| gear-m0-8-12t | module 0.8, 12 teeth: pitch Ø9.6, tip Ø11.2, root Ø7.6, face 6.4, bore Ø3 | STEP · STL |
| gear-m0-8-14t | module 0.8, 14 teeth: pitch Ø11.2, tip Ø12.8, root Ø9.2, face 6.4, bore Ø3 | STEP · STL |
| gear-m0-8-15t | module 0.8, 15 teeth: pitch Ø12, tip Ø13.6, root Ø10, face 6.4, bore Ø4 | STEP · STL |
| gear-m0-8-16t | module 0.8, 16 teeth: pitch Ø12.8, tip Ø14.4, root Ø10.8, face 6.4, bore Ø4 | STEP · STL |
| gear-m0-8-18t | module 0.8, 18 teeth: pitch Ø14.4, tip Ø16, root Ø12.4, face 6.4, bore Ø4 | STEP · STL |
| gear-m0-8-20t | module 0.8, 20 teeth: pitch Ø16, tip Ø17.6, root Ø14, face 6.4, bore Ø5 | STEP · STL |
| gear-m0-8-22t | module 0.8, 22 teeth: pitch Ø17.6, tip Ø19.2, root Ø15.6, face 6.4, bore Ø5 | STEP · STL |
| gear-m0-8-24t | module 0.8, 24 teeth: pitch Ø19.2, tip Ø20.8, root Ø17.2, face 6.4, bore Ø6 | STEP · STL |
| gear-m0-8-25t | module 0.8, 25 teeth: pitch Ø20, tip Ø21.6, root Ø18, face 6.4, bore Ø6 | STEP · STL |
| gear-m0-8-28t | module 0.8, 28 teeth: pitch Ø22.4, tip Ø24, root Ø20.4, face 6.4, bore Ø7 | STEP · STL |
| gear-m0-8-30t | module 0.8, 30 teeth: pitch Ø24, tip Ø25.6, root Ø22, face 6.4, bore Ø8 | STEP · STL |
| gear-m0-8-32t | module 0.8, 32 teeth: pitch Ø25.6, tip Ø27.2, root Ø23.6, face 6.4, bore Ø8 | STEP · STL |
| gear-m0-8-35t | module 0.8, 35 teeth: pitch Ø28, tip Ø29.6, root Ø26, face 6.4, bore Ø9 | STEP · STL |
| gear-m0-8-36t | module 0.8, 36 teeth: pitch Ø28.8, tip Ø30.4, root Ø26.8, face 6.4, bore Ø9 | STEP · STL |
| gear-m0-8-40t | module 0.8, 40 teeth: pitch Ø32, tip Ø33.6, root Ø30, face 6.4, bore Ø10 | STEP · STL |
| gear-m0-8-42t | module 0.8, 42 teeth: pitch Ø33.6, tip Ø35.2, root Ø31.6, face 6.4, bore Ø11 | STEP · STL |
| gear-m0-8-45t | module 0.8, 45 teeth: pitch Ø36, tip Ø37.6, root Ø34, face 6.4, bore Ø12 | STEP · STL |
| gear-m0-8-48t | module 0.8, 48 teeth: pitch Ø38.4, tip Ø40, root Ø36.4, face 6.4, bore Ø13 | STEP · STL |
| gear-m0-8-50t | module 0.8, 50 teeth: pitch Ø40, tip Ø41.6, root Ø38, face 6.4, bore Ø13 | STEP · STL |
| gear-m0-8-56t | module 0.8, 56 teeth: pitch Ø44.8, tip Ø46.4, root Ø42.8, face 6.4, bore Ø15 | STEP · STL |
| gear-m0-8-60t | module 0.8, 60 teeth: pitch Ø48, tip Ø49.6, root Ø46, face 6.4, bore Ø16 | STEP · STL |
| gear-m0-8-64t | module 0.8, 64 teeth: pitch Ø51.2, tip Ø52.8, root Ø49.2, face 6.4, bore Ø17 | STEP · STL |
| gear-m0-8-70t | module 0.8, 70 teeth: pitch Ø56, tip Ø57.6, root Ø54, face 6.4, bore Ø19 | STEP · STL |
| gear-m0-8-72t | module 0.8, 72 teeth: pitch Ø57.6, tip Ø59.2, root Ø55.6, face 6.4, bore Ø19 | STEP · STL |
| gear-m0-8-80t | module 0.8, 80 teeth: pitch Ø64, tip Ø65.6, root Ø62, face 6.4, bore Ø22 | STEP · STL |
Let your AI pull this. Add
Set it up →https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=spur-gears-module-0-8
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Questions
Pitch diameter of a module 0.8, 20-tooth gear?
16 mm; tip 17.6 mm.
Centre distance?
m × (N1 + N2) / 2: a 20 and a 40 tooth module 0.8 pair sit 24 mm apart.