Pololu 37D metal gearmotor (100:1, #4745): Ø36.8 body, 6 mm shaft and M3 face-mount holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pololu-37d-metal-gearmotor/  (sheet CC BY 4.0)
Basis: Pololu product page #4745 and the Pololu 37D metal gearmotor dimension diagram.
Catalog version: 2026-10-20

Overall (mm): length 79.0, width 36.8, height 36.8
- Datum: motor axis on Z, centred on X and Y; back of the motor can on z=0, gearbox face plate at z=57.0.
- Body Ø36.8 × 57.0 (100:1, no encoder); central boss Ø12.0 × 6.0; output shaft Ø6.0 D-shaft × 16.0, ending at z=79.0.
- Six M3 tapped holes in the face plate, 3.0 mm max screw engagement, on a Ø31.0 bolt circle (hexagon, 15.5 between neighbours), first hole on +X.
- Gearbox length varies with ratio: 21.5 (19:1, 30:1), 24.0 (50:1, 70:1), 26.5 (100:1, 131:1, 150:1); encoder versions add a rear encoder.
- Modelled: body as one Ø36.8 cylinder, boss, shaft (flat not modelled), face holes. Not modelled: rear terminals.
- Exact nominal mm.

hole  x (mm)  y (mm)  thread
1  15.5  0  M3
2  7.75  13.42  M3
3  -7.75  13.42  M3
4  -15.5  0  M3
5  -7.75  -13.42  M3
6  7.75  -13.42  M3

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Pololu: 100:1 Metal Gearmotor 37Dx57L mm 12V (#4745) — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/4745
- Pololu: Dimensions of the 37D metal gearmotors (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J1704/37d-metal-gearmotors-dimension-diagram.pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pololu-37d-metal-gearmotor/index.json
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