# JGA25-370 gearmotor: Ø25 gearbox on a 370 can, Ø4 D-shaft > What are the dimensions of a JGA25-370 gear motor? - Category: Electronics › Motors - Kind: Hardware - Basis: RCDrone JGA25-370 listing (drawing values); the can matches Mabuchi's RF-370CA (Ø24.4 × 30.8). Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn. - Page: https://xemstudio.com/objects/jga25-370-gearmotor/ · JSON: https://xemstudio.com/api/geometry?object=jga25-370-gearmotor · Plain text: https://xemstudio.com/objects/jga25-370-gearmotor/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) **Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. ## Notes - Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn. - A Ø25 spur gearbox in front of a 370 can (Ø24.4 × 30.8). The gearbox length L depends on the ratio: 17 (4.4:1, 9.6:1), 19 (21.3:1), 21 (35.5:1, 46.8:1), 23 (78:1, 103:1), 25 (171:1, 226:1), 27 (377:1, 500:1). Files: L = 17, 21 and 27. - Output: a Ø4 shaft on the gearbox axis with a D-flat 3.5 across, 8 mm long at the tip; the shaft stands 12.1 mm from the gearbox face, including a Ø7 × 2.5 boss. - Two M3 tapped holes 4.5 deep on 17 mm centres in the gearbox face, drawn at the major diameter. - The rear boss (Ø6.4), terminals and any encoder are not drawn. The listing notes sizes can vary between batches. - A gearmotor turned backwards by an engine runs the gearbox as a step-up; DIY Stirling builders use small gearmotors this way as low-speed generators. ## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn) | feature | exact | mates with | fit | files | |---|---|---|---|---| | output shaft | Ø4, D-flat 3.5 across × 8 | hub, collar or gear bore (set screw on the flat) | slide | jga25-* | | front boss | Ø7 × 2.5 | mount recess | socket | jga25-* | | mounting holes | 2 × M3 × 4.5 deep on 17 | M3 screws through the mount | designed | jga25-* | | gearbox | Ø25 | cradle or clamp | socket | jga25-* | ## Sizes | feature | mm | from | |---|---|---| | gearbox | Ø25 × 17 to 27 (by ratio) | RCDrone | | can | Ø24.4 × 30.8 | RCDrone, Mabuchi RF-370CA | | boss | Ø7 × 2.5 | RCDrone | | shaft | Ø4, D-flat 3.5 across × 8 | RCDrone | | shaft from the gearbox face | 12.1 | RCDrone | | face holes | 2 × M3 × 4.5 deep on 17 | RCDrone | ## Where the files are - RCDrone: [JGA25-370 gearmotor listing with drawing values: gearbox Ø25 × L by ratio, can Ø24.4 × 30.8, Ø4 D-shaft (3.5 across the flat) 12.1 out, boss Ø7 × 2.5, 2 × M3 × 4.5 deep on 17](https://rcdrone.top/products/jga25-370-dc-gear-motor) — web — listing (verify at link) - Mabuchi Motor (hosted by IBS Electronics): [RF-370CA datasheet and dimension drawing](https://datasheets.ibselectronics.com/RF370CA-15370-Mabuchi-datasheet-7281042.pdf) — PDF — manufacturer datasheet (verify at link) ## Free STEP/STL (3 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/jga25-370-gearmotor/index.json - jga25-370-gearbox-17: [STEP](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-17.step) · [STL](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-17.stl) — JGA25-370 envelope, gearbox Ø25 × 17: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17 - jga25-370-gearbox-21: [STEP](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-21.step) · [STL](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-21.stl) — JGA25-370 envelope, gearbox Ø25 × 21: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17 - jga25-370-gearbox-27: [STEP](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-27.step) · [STL](https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-27.stl) — JGA25-370 envelope, gearbox Ø25 × 27: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17 ## How it fits ### Connects to - [Set-screw shaft collars Ø3 to Ø12](https://xemstudio.com/objects/shaft-collars/): Ø4 collar on the output shaft (slide) - [Spur gears, involute 20°: module 0.5, 1 and 2, 12–60 teeth](https://xemstudio.com/objects/spur-gears-involute/): module 1 16 T gear with a Ø4 bore on the shaft (slide) - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): two M3 into the gearbox face, 17 apart, 4.5 max ### Alternatives - [N20 micro gearmotor 12 × 10 mm, Ø3 D-shaft](https://xemstudio.com/objects/n20-gearmotor/): much smaller 12 × 10 gearmotor - [370 size brushed DC motor: Ø24.4 × 30.8 mm, 2 × M3 on 17](https://xemstudio.com/objects/dc-motor-370-size/): the same can without the gearbox ## Questions **What are JGA25-370 dimensions?** Ø25 gearbox 17–27 long by ratio, on a Ø24.4 × 30.8 can; Ø4 D-shaft 12.1 out (incl. a Ø7 × 2.5 boss); two M3 holes 17 mm apart, 4.5 deep. **What shaft does a JGA25-370 have?** Ø4 mm with a D-flat 3.5 mm across, 8 mm long, on the gearbox axis. **How long is the JGA25-370 gearbox?** 17 mm at 4.4:1 and 9.6:1, up to 27 mm at 377:1 and 500:1. ## Fits with - [370 size brushed DC motor: Ø24.4 × 30.8 mm, 2 × M3 on 17](https://xemstudio.com/objects/dc-motor-370-size/) - [N20 micro gearmotor 12 × 10 mm, Ø3 D-shaft](https://xemstudio.com/objects/n20-gearmotor/) - [TT yellow gearmotor 70 × 22.5 × 18.5 mm, Ø5.5 double-D shafts](https://xemstudio.com/objects/tt-gearmotor/) - [Set-screw shaft collars Ø3 to Ø12](https://xemstudio.com/objects/shaft-collars/) - [Spur gears, involute 20°: module 0.5, 1 and 2, 12–60 teeth](https://xemstudio.com/objects/spur-gears-involute/) - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)