Spur gears, module 2: 10 to 80 teeth (20° involute) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spur-gears-module-2/  (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 2 gears = m × (N1 + N2) / 2. Face width 16 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  20.0  24.0  15.0  16.0  5
12  24.0  28.0  19.0  16.0  7
14  28.0  32.0  23.0  16.0  8
15  30.0  34.0  25.0  16.0  9
16  32.0  36.0  27.0  16.0  9
18  36.0  40.0  31.0  16.0  11
20  40.0  44.0  35.0  16.0  12
22  44.0  48.0  39.0  16.0  14
24  48.0  52.0  43.0  16.0  15
25  50.0  54.0  45.0  16.0  16
28  56.0  60.0  51.0  16.0  18
30  60.0  64.0  55.0  16.0  19
32  64.0  68.0  59.0  16.0  21
35  70.0  74.0  65.0  16.0  23
36  72.0  76.0  67.0  16.0  23
40  80.0  84.0  75.0  16.0  25
42  84.0  88.0  79.0  16.0  25
45  90.0  94.0  85.0  16.0  25
48  96.0  100.0  91.0  16.0  25
50  100.0  104.0  95.0  16.0  25
56  112.0  116.0  107.0  16.0  25
60  120.0  124.0  115.0  16.0  25
64  128.0  132.0  123.0  16.0  25
70  140.0  144.0  135.0  16.0  25
72  144.0  148.0  139.0  16.0  25
80  160.0  164.0  155.0  16.0  25

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-2/index.json
API: https://xemstudio.com/api/geometry?object=spur-gears-module-2