# 370 size brushed DC motor: Ø24.4 × 30.8 mm, 2 × M3 on 17

> What are the dimensions of a 370 size DC motor?

- Category: Electronics › Motors
- Kind: Hardware
- Basis: Mabuchi RF-370CA dimension drawing; boss and hole spacing also on the RCDrone 370 listing. 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/dc-motor-370-size/ · JSON: https://xemstudio.com/api/geometry?object=dc-motor-370-size · Plain text: https://xemstudio.com/objects/dc-motor-370-size/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.
- The can is Ø24.4 × 30.8 with a Ø6.45 × 1.7 boss on each end.
- The Ø2.0 shaft is 42.0 mm long and stands 10.5 mm beyond the front boss: 43.0 mm from the end-cap face to the shaft tip.
- Two M3 × 0.5 tapped holes on 17.0 mm centres in the face. The drawing gives no thread depth, so the holes are drawn Ø3.0 × 2.0 deep only to mark where they are.
- The terminal tabs are 18.3 mm apart on the end cap; they and the wire exit are not drawn.
- The JGA25-370 gearmotor uses this can (see its page).
- 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.

## 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 |
|---|---|---|---|---|
| shaft | Ø2.0 | pinion, pulley or gear bore (pressed on) | press | dc-370-* |
| front boss | Ø6.45 × 1.7 | mount recess | socket | dc-370-* |
| mounting holes | 2 × M3 × 0.5 on 17.0 (drawn 2.0 deep as position marks) | M3 screws through the mount | designed | dc-370-* |
| can | Ø24.4 | cradle | socket | dc-370-* |

## Sizes

| feature | mm | from |
|---|---|---|
| can | Ø24.4 × 30.8 | Mabuchi RF-370CA |
| front and rear boss | Ø6.45 × 1.7 | Mabuchi RF-370CA |
| shaft | Ø2.0 × 42.0 long | Mabuchi RF-370CA |
| shaft beyond the front boss | 10.5 | Mabuchi RF-370CA |
| end cap to shaft tip | 43.0 | Mabuchi RF-370CA |
| face holes | 2 × M3 × 0.5 on 17.0 | Mabuchi RF-370CA, RCDrone |
| terminal spacing | 18.3 | Mabuchi RF-370CA, RCDrone |

## Where the files are

- 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)
- RCDrone: [370 brushed motor listing with drawing values: Ø24.4 × 30.8, boss Ø6.5 × 1.5, M3 on 17, terminals 18.3 apart](https://rcdrone.top/ja/products/rs370-brushed-dc-motor-quantity-packs) — web — listing (verify at link)

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/dc-motor-370-size/index.json

- dc-370-size: [STEP](https://xemstudio.com/files/hardware/dc-motor-370-size/dc-370-size.step) · [STL](https://xemstudio.com/files/hardware/dc-motor-370-size/dc-370-size.stl) — 370 size envelope: Ø24.4 × 30.8 can, Ø6.45 × 1.7 bosses front and rear, Ø2.0 shaft 10.5 beyond the boss, 2 × M3 on 17.0 (2.0 deep position marks)

## How it fits

### Connects to
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): two M3 into the face holes, 17.0 apart
- [Spur gears, involute 20°: module 0.5, 1 and 2, 12–60 teeth](https://xemstudio.com/objects/spur-gears-involute/): module 0.5 gears with a Ø2 bore on the Ø2.0 shaft (press)

### Alternatives
- [JGA25-370 gearmotor: Ø25 gearbox on a 370 can, Ø4 D-shaft](https://xemstudio.com/objects/jga25-370-gearmotor/): the same can behind a 25 mm gearbox
- [380 / 385 size brushed DC motor: Ø27.7 × 37.8 mm, 2 × M2.6 on 16](https://xemstudio.com/objects/dc-motor-380-size/): bigger Ø27.7 can

## Questions

**What are 370 motor dimensions?**

Ø24.4 × 30.8 mm can, Ø2.0 shaft 10.5 beyond a Ø6.45 × 1.7 boss (43.0 from the end cap to the tip), two M3 holes 17.0 apart.

**What is the 370 motor hole spacing?**

Two M3 × 0.5 tapped holes on 17.0 mm centres, either side of the boss.

**Is a 370 the same as a 380?**

No: the 370 is a Ø24.4 can with M3 on 17.0; the 380 is a Ø27.7 can with M2.6 on 16.0.

## Fits with

- [JGA25-370 gearmotor: Ø25 gearbox on a 370 can, Ø4 D-shaft](https://xemstudio.com/objects/jga25-370-gearmotor/)
- [380 / 385 size brushed DC motor: Ø27.7 × 37.8 mm, 2 × M2.6 on 16](https://xemstudio.com/objects/dc-motor-380-size/)
- [130 size brushed DC motor: Ø20.1 / 15.1 × 25.0 mm, Ø2 shaft](https://xemstudio.com/objects/dc-motor-130-size/)
- [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/)