JGA25-370 DC Gear Motor, 12V/24V, 12–1364 RPM, 25mm Metal Gearbox and 4mm D-Shaft
JGA25-370 DC Gear Motor, 12V/24V, 12–1364 RPM, 25mm Metal Gearbox and 4mm D-Shaft
Jiali Motor
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JGA25-370 Brushed DC Gear Motor
The JGA25-370 is a compact brushed DC gear motor with a metal reduction gearbox, a 4mm D-shaped output shaft and reversible rotation. Choose a 12V or 24V motor, the required no-load output speed, and a motor-only or accessory package for robotics, small mechanisms and electronics projects.
The selectable speeds are 12, 16, 27, 35, 58, 77, 128, 169, 282, 625 and 1364 RPM. These options match the supplier's 6000RPM motor-before-reduction series. Output RPM is measured without load; speed decreases under load. A bracket shown in a photograph is included only when the selected Package names a bracket.
Construction and Speed Control
- Metal reduction gears in a multi-stage arrangement, copper winding, permanent-magnet motor and carbon brushes.
- PWM speed control is possible with a compatible external brushed-DC controller. A controller is included only in the specified packages.
- For the bare two-terminal motor, reversing motor-lead polarity reverses rotation. With a controller fitted, use its direction control and keep controller supply polarity correct.
- The gear ratio determines the speed/torque trade-off. Reducing speed electrically does not provide the same torque increase as selecting a higher reduction ratio.
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Brand / model | Jiali Motor / JGA25-370 |
| Motor type | Brushed permanent-magnet DC gear motor |
| Rated supply | 12V DC or 24V DC, according to selected variant |
| No-load speed before reduction | 6000RPM |
| Gearbox diameter | 25mm |
| Motor body | 24.4mm diameter; 30.8mm length |
| Gearbox length L | 17–27mm, depending on reduction ratio |
| Output shaft | 4mm diameter D-shaft; 3.5mm across flat; 8mm flat length |
| Output shaft projection | 12.1mm from gearbox front, including the 2.5mm locating boss; 9.6mm exposed beyond the boss |
| Flat dimension tolerance | 3.5mm −0.02mm, as marked on the drawing |
| Locating boss | 7mm diameter × 2.5mm projection |
| Front mounting | Two M3 threaded holes, 4.5mm deep, with 17mm centre spacing |
| Additional front drawing references | Two 5mm features (−0.1mm) at 17mm spacing |
| Rear drawing references | 6.4mm rear boss diameter; terminal projection 3.5mm; terminal feature marked 2mm. Rear view also marks 6mm, 3mm and 10mm reference dimensions. |
| Reduction ratio | 4.4:1–500:1 |
| Motor-only weight | Approximately 93–100g according to ratio; overview states approximately 100g |
| Rated current / power | 12V: 0.35A / 4.2W; 24V: 0.15A / 3.6W, per supplier performance table |
| Supplier operating claims | −10°C to 70°C; overview lists 24-hour use. Actual duty suitability depends on load and cooling. |
| Noise | Supplier states approximately 55dB, varying with speed and load; measurement conditions are not specified |
Dimensions are supplier reference measurements and may vary. Motor appearance and components can differ between versions. No encoder, controller input-frequency specification or closed-loop positioning function is specified.
Performance by Voltage and Gear Ratio
Output speeds below are no-load speeds. Loaded speeds and torque are listed at the supplier maximum-efficiency operating point. Values are supplier data, not independent test results. Torque is in kgf·cm, not kilograms of lifting capacity. Stall values are limits, not continuous operating ratings.
12V — 6000RPM Before Reduction
| Ratio | Gearbox L (mm) | No-load RPM | No-load current (A) | Loaded RPM | Torque at max. efficiency (kgf·cm) | Loaded current (A) | Power (W) | Stall torque (kgf·cm) | Stall current (A) | Stall power (W) | Motor weight (g) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4.4 | 17 | 1364 | 0.05 | 1100 | 0.12 | 0.35 | 4.2 | 0.6 | 1.5 | 18 | 93 |
| 9.6 | 17 | 625 | 0.05 | 500 | 0.3 | 0.35 | 4.2 | 1.2 | 1.5 | 18 | 93 |
| 21.3 | 19 | 282 | 0.05 | 225 | 0.5 | 0.35 | 4.2 | 2.5 | 1.5 | 18 | 95 |
| 35.5 | 21 | 169 | 0.05 | 135 | 1 | 0.35 | 4.2 | 5 | 1.5 | 18 | 95 |
| 46.8 | 21 | 128 | 0.05 | 100 | 1.2 | 0.35 | 4.2 | 6 | 1.5 | 18 | 96 |
| 78 | 23 | 77 | 0.05 | 60 | 1.6 | 0.35 | 4.2 | 9 | 1.5 | 18 | 96 |
| 103 | 23 | 58 | 0.05 | 48 | 2.2 | 0.35 | 4.2 | 10 | 1.5 | 18 | 98 |
| 171 | 25 | 35 | 0.05 | 28 | 2.8 | 0.35 | 4.2 | 13 | 1.5 | 18 | 98 |
| 226 | 25 | 27 | 0.05 | 22 | 5 | 0.35 | 4.2 | 15 | 1.5 | 18 | 98 |
| 377 | 27 | 16 | 0.05 | 13 | 7 | 0.35 | 4.2 | 15 | 1.5 | 18 | 100 |
| 500 | 27 | 12 | 0.05 | 9.6 | 9 | 0.35 | 4.2 | 15 | 1.5 | 18 | 100 |
24V — 6000RPM Before Reduction
| Ratio | Gearbox L (mm) | No-load RPM | No-load current (A) | Loaded RPM | Torque at max. efficiency (kgf·cm) | Loaded current (A) | Power (W) | Stall torque (kgf·cm) | Stall current (A) | Stall power (W) | Motor weight (g) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4.4 | 17 | 1364 | 0.04 | 1100 | 0.15 | 0.15 | 3.6 | 0.7 | 0.6 | 14.4 | 93 |
| 9.6 | 17 | 625 | 0.04 | 500 | 0.3 | 0.15 | 3.6 | 1.5 | 0.6 | 14.4 | 93 |
| 21.3 | 19 | 282 | 0.04 | 225 | 0.6 | 0.15 | 3.6 | 3 | 0.6 | 14.4 | 95 |
| 35.5 | 21 | 169 | 0.04 | 135 | 1.2 | 0.15 | 3.6 | 5.5 | 0.6 | 14.4 | 95 |
| 46.8 | 21 | 128 | 0.04 | 100 | 1.3 | 0.15 | 3.6 | 6.5 | 0.6 | 14.4 | 96 |
| 78 | 23 | 77 | 0.04 | 60 | 1.6 | 0.15 | 3.6 | 9 | 0.6 | 14.4 | 96 |
| 103 | 23 | 58 | 0.04 | 48 | 2.5 | 0.15 | 3.6 | 11 | 0.6 | 14.4 | 98 |
| 171 | 25 | 35 | 0.04 | 28 | 3.2 | 0.15 | 3.6 | 15 | 0.6 | 14.4 | 98 |
| 226 | 25 | 27 | 0.04 | 22 | 6.5 | 0.15 | 3.6 | 15 | 0.6 | 14.4 | 98 |
| 377 | 27 | 16 | 0.04 | 13 | 8 | 0.15 | 3.6 | 15 | 0.6 | 14.4 | 100 |
| 500 | 27 | 12 | 0.04 | 9.6 | 9 | 0.15 | 3.6 | 15 | 0.6 | 14.4 | 100 |
Optional Mounting Bracket
The illustrated L-bracket is 3mm thick and 26.2mm wide, with a 33.5mm base and 33.5mm upright. Its motor face has two 3.5mm mounting holes with 6mm recesses, at 17mm spacing, and an 8mm centre opening positioned 13mm below the top. The base drawing shows four 3.5mm holes at 14 × 16mm spacing, an 8mm side reference, a 7mm centre offset and a 10mm centre opening. The bracket is supplied only with the applicable Package.
Wiring and Use
Use a DC supply matching the selected motor voltage. In the illustrated controller arrangement, connect the supply to the controller's power input with correct polarity, and connect the controller motor output to the two motor terminals. The illustration shows red positive and black negative motor leads, a speed knob, a reversing switch and a supply adapter connection. Confirm actual terminal labels before powering on. Never reverse the controller's power input to reverse the motor, and stop the motor before changing direction.
Choose the motor by its rated-load torque rather than its stall torque. Do not overload, stall or operate close to stall: the motor or gears can be damaged. Loads above the rated condition reduce speed. Lowering electrical speed can also reduce available torque. Controller ratings, adapter mains-input rating, plug type and included cable/connector details are not fully specified in the supplied listing; verify these details for the selected accessories.
Package Contents
One JGA25-370 motor in the selected voltage and speed, plus only the accessories named in the Package option:
- Motor Only
- Motor + Bracket
- Motor + Speed Controller
- Motor + Power Supply
- Motor + Bracket + Speed Controller
- Motor + Bracket + Power Supply
- Motor + Speed Controller + Power Supply
- Motor + Bracket + Speed Controller + Power Supply
Motor Only does not include a bracket, speed controller or power supply. Product and accessory illustrations are reference views.