Spur gears, module 1.5: 10 to 80 teeth (20° involute) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spur-gears-module-1-5/  (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 1.5 gears = m × (N1 + N2) / 2. Face width 12 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  15.0  18.0  11.25  12.0  4
12  18.0  21.0  14.25  12.0  5
14  21.0  24.0  17.25  12.0  6
15  22.5  25.5  18.75  12.0  7
16  24.0  27.0  20.25  12.0  7
18  27.0  30.0  23.25  12.0  8
20  30.0  33.0  26.25  12.0  9
22  33.0  36.0  29.25  12.0  10
24  36.0  39.0  32.25  12.0  11
25  37.5  40.5  33.75  12.0  12
28  42.0  45.0  38.25  12.0  13
30  45.0  48.0  41.25  12.0  14
32  48.0  51.0  44.25  12.0  15
35  52.5  55.5  48.75  12.0  17
36  54.0  57.0  50.25  12.0  18
40  60.0  63.0  56.25  12.0  20
42  63.0  66.0  59.25  12.0  21
45  67.5  70.5  63.75  12.0  22
48  72.0  75.0  68.25  12.0  24
50  75.0  78.0  71.25  12.0  25
56  84.0  87.0  80.25  12.0  25
60  90.0  93.0  86.25  12.0  25
64  96.0  99.0  92.25  12.0  25
70  105.0  108.0  101.25  12.0  25
72  108.0  111.0  104.25  12.0  25
80  120.0  123.0  116.25  12.0  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-1-5/index.json
API: https://xemstudio.com/api/geometry?object=spur-gears-module-1-5