TT yellow gearmotor 70 × 22.5 × 18.5 mm, Ø5.5 double-D shafts — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tt-gearmotor/  (CC BY 4.0)
Basis: Common supplier drawings for the yellow TT (1:48) gearmotor; clones vary by about ±0.5 mm
Catalog version: 2026-10-20

Sizes: see table below
- The TT envelope is a 37 × 22.5 × 18.5 mm gearbox plus a Ø18.5 × 33 motor: 70 × 22.5 × 18.5 overall.
- The output is a Ø5.5 double-D shaft, 3.7 mm across the flats, sticking out 9.5 mm on both sides (41.5 across).
- Two Ø3.2 holes run through the gearbox's 22.5 mm width, 17.6 mm apart along its length and 17.5 mm apart in height.
- Many clones vary by about ±0.5 mm.

feature  size_mm
overall  70 × 22.5 × 18.5
gearbox  37 × 22.5 × 18.5
shaft  Ø5.5 double-D, 3.7 across flats
shaft span  41.5
holes  2 × Ø3.2

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/tt-gearmotor/index.json
API: https://xemstudio.com/api/geometry?object=tt-gearmotor