Feetech FS90R continuous rotation servo — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/  (sheet CC BY 4.0)
Basis: Feetech FS90R datasheet (maker PDF, hosted by Pololu); Pololu spec table (secondary)
Catalog version: 2026-10-20

Overall (mm): length 22.5, width 12.1, height 27.7
- The Feetech FS90R is a 9 g, 360° continuous-rotation micro servo. Feetech's datasheet gives its size as A 22.5 mm, B 12.1 mm, C 27.7 mm, a 21-tooth (4.86 mm) output spline, a 250 mm lead and 4.8–6 V.
- Feetech does not say in text which axis C is; it is taken as the overall height, the larger of the two published third dimensions, so the envelope encloses the body either way. Pololu's 23.4 mm likely leaves out the shaft boss — check yours before cutting a tight pocket.
- The file is an envelope box 22.5 × 12.1 × 27.7 mm at the published size, true size, no printing allowance. Mounting ears, output shaft and lead are not modelled.

dimension  value
A (body length)  22.5 mm
B (body width)  12.1 mm
C  27.7 mm (datasheet); Pololu lists 23.4 mm
weight  9 g ± 0.2
output spline  21 T (4.86 mm)
lead  250 mm ± 5 (datasheet); Pololu 10 in
voltage  4.8–6 V
pulse range / stop  700–2300 µs / 1500 µs
stall torque  1.3 kg·cm (4.8 V), 1.5 kg·cm (6 V)
no-load speed  80 rpm (4.8 V), 100 rpm (6 V)
mounting-ear span and holes  on the datasheet drawing only (not in text)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Feetech (via Pololu): FS90R datasheet (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J1867/FS90R.pdf
- Pololu (retailer): FS90R specs — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/2820/specs

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/index.json
API: https://xemstudio.com/api/geometry?object=feetech-fs90r-continuous-rotation-servo