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CC-GM-POLOLU-DS-25d-27 revA
Size datasheet - 25d-27
Pololu 25D metal gearmotor, 27 mm gearbox
Size datasheet: this size's values with their levels, conventions and sources.
25d-27, gearbox face, 0.75:1
25d-27, side, 0.25:1 (hidden lines dashed)
For Pololu 25D gearmotor brackets and mounts
Part keys gearmotors-pololu-25d-27, gearmotors-pololu-25d-27- enc (encoder)
Files 2 STEP AP214 (simplified):
without and with the encoder
Sym. Dimension Value
D Gearbox diameter 25.0
Lg Gearbox length 27 Dm Motor can diameter 24.4
Lm Motor can length 30.8
d Output shaft diameter 4.0
G Across the shaft's flat 3.5 E Shaft length from the face 12.5
B Front boss diameter To
h Front boss height 2.5
n Number of mounting holes 2
M Mounting hole thread 3
th Mounting hole depth 6.0
e Hole offset from the shaft (25D) 8.5
Br Rear boss diameter 6.4
hr Rear boss height 1.5
ut Terminal reach past the can 4.2
pt Across the terminals 18.1
tw Terminal width 2.1
tt Terminal thickness 0.3
le Encoder cover length (- enc) 14.7
De Encoder cover diameter (-enc) 25.0
Modeled value: nominal, else the midpoint of min-max. < / 2: only that limit is given. * amber: one source (LO). c: a source value was corrected. Level - independent sources.
Pololu's dimension diagrams (maker drawings), TT Motor and NFP Page 1/2 Pololu 25D and 37D gearmotor - 25d-27 - Dimensions in mm - CC-BY 4.0, IronPixel Labs LLC spec c5fa7152767e6d6286420b3e684bféabd9e752c5
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.
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CC-GM-POLOLU-DS-25d-27 revA Size datasheet - 25d-27
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Conventions
« Pololu's drawings: No published standard: the parts are Pololu's, and Pololu's dimension diagrams are their maker drawings. TT Motor and NFP cross-check the gearbox lengths and the 37D's shaft.
« Where makers differ: The largest stated shaft length, gearbox, can, bosses, terminals and encoder cover, so a mount made to the model clears every maker's motor; each maker's value is on the page. The shaft, its flat, the threads and the hole positions stay exact.
« Gearbox and face: The gearbox's front chamfer, the 25D's two seam grooves, the 37D's arc recess round the boss, the cross-head plate screws and the boss's chamfer. Illustrative, not Pololu's design, checked for fit only.
* Holes, shaft, can and encoder: Tapped holes as plain bores at the thread's nominal diameter to Pololu's stated depth; the flat's length and the shaft's end chamfer; the can's rounded rear edge, nylon end cap, terminal holes and red polarity dot; the encoder cover's walls and header slot; the CommunityCAD mark. Illustrative.
Sources Source Publisher Retrieved a256 pololu-25d-gearmotors Pololu 2026-11-05 2bbda2bdcbaf ttmotor-gm25-370ca Shenzhen TT Motor 2026-11-07 9cdcb10a4903
The whole series (verification map, corrections, drawings): CC-GM-POLOLU-DSs.
Pololu's dimension diagrams (maker drawings), TT Motor and NFP Page 2/2 Pololu 25D and 37D gearmotor - 25d-27 - Dimensions in mm - CC-BY 4.0, IronPixel Labs LLC spec c5fa7152767e6d6286420b3e684bféabd9e752c5
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.