DESCRIPTION
The GA25-370 is a compact brushed DC gear motor with a 25 mm gearbox, metal gears, copper windings, and a 4 mm D-shaped output shaft. Choose a 6V, 12V, or 24V version and the nominal no-load output speed required for your mechanism.
Use the performance table to compare rated output speed and torque before selecting a configuration. The motor supports speed adjustment and forward and reverse rotation.
KEY FEATURES
- Compact 25 mm diameter gearbox
- 6V, 12V, and 24V DC versions
- Metal gears, copper windings, and carbon brushes
- 4 mm D-shaped output shaft
- Selectable nominal no-load output speeds
- Rated output torque up to 12 kgf·cm on selected configurations
- Variable-speed and bidirectional operation
SPECIFICATIONS
| Parameter | Specification |
|---|---|
| Product model | GA25-370 |
| Model designation in performance tables | 25R-370 |
| Motor type | Brushed DC gear motor |
| Rated voltage | 6V DC, 12V DC, or 24V DC |
| Gearbox diameter | 25 mm |
| Gear material | Metal |
| Windings | Copper |
| Brushes | Carbon |
| No-load output speed range | 6–916 RPM |
| Rated output torque | Up to 12 kgf·cm, configuration-dependent |
| Rated power | 3.2 W |
| Output speed tolerance | ±10% in the performance tables |
| Rotation | CW / CCW |
| Speed adjustment | Supported |
| Output shaft | Ø4 mm D-shaft |
| Gearbox length | 17.5–27 mm |
| Listed motor weight | 105–115 g, configuration-dependent |
OUTPUT SPEED AND TORQUE
The variant selector shows nominal no-load output speed. Rated output speed is measured at the specified rated load.
| No-Load Output Speed | Gear Ratio | Rated Output Speed | Rated Output Torque |
|---|---|---|---|
| 6 RPM | 990:1 | 5.5 RPM | 12 kgf·cm |
| 12.5 RPM | 477:1 | 12 RPM | 9 kgf·cm |
| 14.5 RPM | 406:1 | 12.5 RPM | 8 kgf·cm |
| 27 RPM | 217:1 | 23 RPM | 6 kgf·cm |
| 36 RPM | 166:1 | 28 RPM | 4.5 kgf·cm |
| 61 RPM | 98.7:1 | 45 RPM | 3.3 kgf·cm |
| 88 RPM | 68.2:1 | 85 RPM | 2.5 kgf·cm |
| 133 RPM | 44.8:1 | 130 RPM | 1.8 kgf·cm |
| 214 RPM | 28:1 | 160 RPM | 1.2 kgf·cm |
| 294 RPM | 20.4:1 | 200 RPM | 0.8 kgf·cm |
| 524 RPM | 11.45:1 | 350 RPM | 0.3 kgf·cm |
| 647 RPM | 9.27:1 | 420 RPM | 0.2 kgf·cm |
| 8.5 RPM | 990:1 | 7.5 RPM | 12 kgf·cm |
| 17.8 RPM | 477:1 | 15 RPM | 9 kgf·cm |
| 21 RPM | 406:1 | 18 RPM | 8 kgf·cm |
| 39 RPM | 217:1 | 30 RPM | 6 kgf·cm |
| 51 RPM | 166:1 | 43 RPM | 4.5 kgf·cm |
| 86 RPM | 98.7:1 | 65 RPM | 3.3 kgf·cm |
| 124 RPM | 68.2:1 | 85 RPM | 2.5 kgf·cm |
| 189 RPM | 44.8:1 | 130 RPM | 1.8 kgf·cm |
| 416 RPM | 20.4:1 | 300 RPM | 0.8 kgf·cm |
| 742 RPM | 11.45:1 | 540 RPM | 0.45 kgf·cm |
| 916 RPM | 9.27:1 | 640 RPM | 0.25 kgf·cm |
ELECTRICAL SPECIFICATIONS
The 6–647 RPM options in the first group above use the 6000 RPM motor version. The 8.5–916 RPM options in the second group use the 8500 RPM motor version.
| Motor Version | Rated Current Range | Stall Current | Starting Voltage |
|---|---|---|---|
| 6V / 6000 RPM | 0.60–0.85 A | 2.8 A | 0.8 V |
| 6V / 8500 RPM | 0.65–0.85 A | 4.5 A | 0.8 V |
| 12V / 6000 RPM | 0.55–0.65 A | 1.5 A | 0.8 V |
| 12V / 8500 RPM | 0.55–0.65 A | 3.5 A | 0.8 V |
| 24V / 6000 RPM | 0.40–0.50 A | 0.98 A | 1.8 V |
| 24V / 8500 RPM | 0.35–0.50 A | 1.8 A | 0.8 V |
STALL TORQUE REFERENCE
| Gear Ratio | 6000 RPM Motor Version | 8500 RPM Motor Version |
|---|---|---|
| 9.27:1 | 0.6 kgf·cm | 0.7 kgf·cm |
| 11.45:1 | 0.75 kgf·cm | 0.8 kgf·cm |
| 20.4:1 | 2.3 kgf·cm | 2.5 kgf·cm |
| 28:1 | 3 kgf·cm | 3.2 kgf·cm |
| 44.8:1 | 4.7 kgf·cm | 5 kgf·cm |
| 68.2:1 | 6.3 kgf·cm | 6.5 kgf·cm |
| 98.7:1 | 11.2 kgf·cm | 11.5 kgf·cm |
| 166:1 | 18.5 kgf·cm | 19.2 kgf·cm |
| 217:1 | 21 kgf·cm | 21.6 kgf·cm |
| 406:1 | 31.5 kgf·cm | 32.4 kgf·cm |
| 477:1 | 37 kgf·cm | 38.3 kgf·cm |
| 990:1 | 43.5 kgf·cm | 45.4 kgf·cm |
DIMENSIONS
| Parameter | Dimension |
|---|---|
| Gearbox diameter | Ø25 mm (+0 / −0.2 mm) |
| Motor body diameter | Ø24.2 mm |
| Motor body length | 30.8 mm |
| Output shaft diameter | Ø4 mm (+0 / −0.03 mm) |
| Shaft dimension across flat | 3.5 mm (+0 / −0.1 mm) |
| Shaft tip to gearbox front face | 14 ± 0.5 mm |
| Shaft flat length | 9 mm (+0.2 / 0 mm) |
| Front pilot diameter | Ø7 mm |
| Front pilot projection | 2.5 mm |
| Front mounting holes | 2 × M3 |
| Mounting hole spacing | 17 ± 0.2 mm |
| Gear Ratios | Gearbox Length | Listed Motor Weight |
|---|---|---|
| 9.27:1, 11.45:1 | 17.5 mm | 105 g |
| 20.4:1, 28:1 | 19 mm | 105 g |
| 44.8:1, 68.2:1 | 21 mm | 110 g |
| 98.7:1, 166:1 | 23 mm | 110 g |
| 217:1, 406:1 | 25 mm | 115 g |
| 477:1, 990:1 | 27 mm | 115 g |
APPLICATIONS
For compact mechanisms requiring a geared DC drive with a 4 mm output shaft. Check rated output speed, torque, shaft dimensions, and mounting spacing against your assembly before selecting a configuration.
WHAT’S INCLUDED
- 1 × GA25-370 DC gear motor in the selected voltage and output speed configuration
FAQ
What does the RPM in the variant selector mean?
The selector shows nominal no-load output speed. For example, the 61 RPM option delivers 45 RPM at its rated output torque of 3.3 kgf·cm.
Which option provides 12 kgf·cm of rated torque?
The 6 RPM and 8.5 RPM options are listed at 12 kgf·cm rated output torque. Their rated output speeds are 5.5 RPM and 7.5 RPM, respectively.
Can the GA25-370 run forward and reverse at adjustable speeds?
Yes. It supports speed adjustment and CW/CCW rotation. Select an external brushed DC motor controller appropriate for the chosen voltage and current requirements.
What size is the output shaft?
The motor has a 4 mm D-shaft with a 3.5 mm dimension across the flat. Check the dimension table before selecting a coupling or hub.
Does motor length vary with the selected speed?
Gearbox length varies with the reduction ratio, ranging from 17.5 to 27 mm. Use the performance table to identify the ratio, then check the dimensions table.
