540 size brushed DC motor: Ø35.8 × 50.0 mm, 2 × M3 on 25 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/dc-motor-540-size/ (CC BY 4.0) Basis: Mabuchi RS-540RH / RS-540SH dimension drawing; outside size also on Mabuchi's Let's Motorize line-up. Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn. Catalog version: 2026-10-20 Sizes: see table below - Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn. - The can is Ø35.8 × 50.0 mm. - The Ø3.17 (1/8 in) shaft is drawn 13.0 mm out from the front face. - Two M3 × 0.5 tapped holes on 25.0 mm centres, drawn at the major diameter 5.0 deep: the drawing allows screws 5.0 into the motor and no more. - The front boss is Ø13.0 and the rear one Ø10.2; their heights did not come through in a form I could check, so neither is drawn. Clear Ø13.0 in a mount. - Vent holes, terminal tabs and the wire exit are not drawn. - In DIY Stirling builds, brushed DC motors of this kind are turned by the engine and used as a generator (an LED, a resistor or a meter across the leads) or as a load on the flywheel shaft. feature mm from can Ø35.8 × 50.0 Mabuchi RS-540, Let's Motorize shaft Ø3.17 Mabuchi RS-540 shaft from the face 13.0 Mabuchi RS-540 face holes 2 × M3 × 0.5 on 25.0 Mabuchi RS-540 usable screw length 5.0 Mabuchi RS-540 front boss Ø13.0 (height not given here) Mabuchi RS-540 rear boss Ø10.2 (height not given here) Mabuchi RS-540 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Mabuchi Motor (hosted by mikrocontroller.net): RS-540RH / RS-540SH datasheet and dimension drawing — PDF — manufacturer datasheet [verify license at link] — https://www.mikrocontroller.net/attachment/228490/rs_540rhsh.pdf - Mabuchi Motor: Let's Motorize: motor line-up with outside size (length × diameter) and shaft Ø for FA-130RA, RE-140RA, RE-260RA, RE-280RA, RS-380PH, RS-540SH — web — manufacturer page [verify license at link] — https://www.mabuchi-motor.co.jp/motorize/branch/motor/ Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/dc-motor-540-size/index.json API: https://xemstudio.com/api/geometry?object=dc-motor-540-size