N20 micro gearmotor 12 × 10 mm, Ø3 D-shaft — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/n20-gearmotor/  (CC BY 4.0)
Basis: Common supplier drawings for the N20 micro metal gearmotor; gearbox length varies by ratio
Catalog version: 2026-10-20

Sizes: see table below
- The N20 is 12 × 10 mm in section: a 15 mm motor with R2 rounded edges plus a gearbox 9–12 mm long depending on ratio; the file has the 9 mm gearbox (24 mm body).
- The output is a Ø3 D-shaft, 2.5 mm across the flat, 10 mm long; 34 mm overall.
- The gearbox face has two M1.6 holes 9 mm apart, drawn as Ø1.6 × 4 deep.

feature  size_mm
section  12 × 10
motor  15
gearbox (this file)  9
shaft  Ø3 D, 2.5 across flat × 10
face holes  2 × M1.6 on 9

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Pololu: Micro metal gearmotor dimension diagram — PDF, STEP — Pololu site terms [verify license at link] — https://www.pololu.com/category/60/micro-metal-gearmotors
- DFRobot: TT geared motor drawing — web — DFRobot site terms [verify license at link] — https://www.dfrobot.com/product-100.html
- Wikipedia: DC motor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/DC_motor

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/n20-gearmotor/index.json
API: https://xemstudio.com/api/geometry?object=n20-gearmotor