Spur gears, module 0.8: 10 to 80 teeth (20° involute) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spur-gears-module-0-8/  (CC BY 4.0)
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)
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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

Free files (CC BY 4.0, Xem Studio; STEP + STL, 26 parts): https://xemstudio.com/files/hardware/spur-gears-module-0-8/index.json
API: https://xemstudio.com/api/geometry?object=spur-gears-module-0-8