550 / 555 size brushed DC motor: Ø35.8 × 57.0 mm, 2 × M3 on 25 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/dc-motor-550-555-size/ (CC BY 4.0) Basis: Mabuchi RS-550PC and RS-555VC dimension drawings; can size and M3-on-25 face also on the RCDrone 555 listing. 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 550 and 555 share one can: Ø35.8 × 57.0 mm. Files: the 550 with its 13.2 mm shaft and the 555 with its 23.2 mm shaft, both measured from the front face. - The Ø3.17 shaft carries a pinion or a pulley; the 555 sold for drills often has a pressed-on pinion, which is not drawn. - Two M3 × 0.5 tapped holes on 25.0 mm centres, drawn at the major diameter 4.0 deep: the drawings allow screws 4.0 into the motor. - Front boss Ø13.0, rear boss Ø10.2; their heights did not come through in a form I could check, so neither is drawn. The drawings' Ø38.5 maximum and the vent holes, terminals and wire exit are not drawn either. - 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 × 57.0 Mabuchi RS-550PC / RS-555VC shaft Ø3.17 Mabuchi drawings shaft from the face 13.2 (550) / 23.2 (555) Mabuchi drawings face holes 2 × M3 × 0.5 on 25.0 Mabuchi drawings, RCDrone usable screw length 4.0 Mabuchi drawings front boss Ø13.0 (height not given here) Mabuchi drawings rear boss Ø10.2 (height not given here) Mabuchi drawings overall on the drawing 75.0 (550) / 85.0 (555) Mabuchi drawings Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Mabuchi Motor (compiled catalogue, hosted by mikrocontroller.net): Carbon-brush and metal-brush motor datasheets incl. RS-360RH, RS-365SH, RS-385SH, RS-550PC, RS-555VC, RS-775VC dimension drawings — PDF — manufacturer datasheets [verify license at link] — https://mikrocontroller.net/attachment/641472/Mabuchi_Motors_Complete.pdf - RCDrone: 555 brushed motor listing with drawing values: Ø36 × 57, Ø3.175 shaft, two M3 on 25 — web — listing [verify license at link] — https://rcdrone.top/es/products/555-brushed-dc-motor-quantity-packs Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/dc-motor-550-555-size/index.json API: https://xemstudio.com/api/geometry?object=dc-motor-550-555-size