GR-WM2 24V DC RS-595 Motor with 152:1 Gearbox

This version of the GR-WM2 has now been replaced, please head to the 2019 GR-WM2 page for information on the improved model

The GR-WM2 is a 24V DC motor and gearbox combination featuring a three-stage 152:1 reduction gearbox. The first gearbox stage is a worm and wheel meaning that the transmission cannot be back-driven once in position. The gearbox is very sturdy outside and in; all six gears are constructed of metal with the output stage spur gears a relatively large 1.25 MOD size, allowing for high torque transmission. A 12mm output shaft with dual ball-bearing support means that large loads can be mounted directly to the gearbox.

The no-load speed at 24V DC at the output shaft is 42rpm, reducing to 35rpm at the maximum efficiency torque output of 40kg-cm (3.9Nm, 555oz-in). Short term torque output may exceed 150kg-cm. The motor may be operated at anywhere between 3-24V, with a maximum continuous power of 35W at 24V (higher power for short periods). 

Please see further operating details under the 'technical details' below.


This gearmotor provides an ideal solution for applications requiring a high output torque from a compact device which doesn't demand high levels of current. The right-angle output shaft also enables the motor to fit into positions that planetary and conventional spur gear motors wouldn't be able to.

Special effects, DIY, robotics and automation projects could all benefit from the steady output speed and the resistance to being rotated which is provided by the worm and wheel stage once the motor is in a position. The 12mm output shaft and gear stage is much stronger than that of similar motors on the market, meaning that larger radial loads can be supported without causing damage to the gearbox. 

As with any brushed DC motor it is possible to vary the output speed by regulating the supplied current with a PWM speed controller, and to change the direction of rotation by swapping the polarity of the supplied current. We also stock power supplies, rocker switches, remote switches and speed controllers that are ideal for controlling these motors. 

The motor is a '595' type, with a 36mm can diameter. It features a cooling fan towards the rear of its body to enable high duty cycle operation. For continuous usage (100% duty cycle) please don't exceed 40kg-cm of torque at 24V, and ensure that the rear of the motor is well ventilated. 

Lead Options

The motor is normally supplied without leads and has two copper tabs which may be soldered or crimped onto. Options are provided for either a male DC connector lead (2.1 x 5.5mm barrel type), which extends 250mm from the motor, or for two (red and black) 1mm2 silicone insulated leads with tinned ends running 500mm from the motor. If a lead option is added please allow for up-to an additional working day to process your order.

This motor is similar to the GR-WM1 that we also stock, though with a slightly more powerful motor and a higher gearbox reduction ratio. 

Major dimensions for the motor are illustrated below. Scroll down to 'Technical Details' for construction details and operating specifications.

Gearbox Build Detail
Size:The gearbox body has dimensions of 58 x 58 x 37mm excluding the output shaft
The motor is a maximum of 37.5mm in diameter by 71mm long (without either lead option fitted)
The overall motor and gearbox size including the output shaft is 129 x 58 x 58mm
Mounting:Three M4 (5.5mm deep) threaded holes on the side face of the gearbox (the same side that the output shaft extends from)
Body material:Sintered steel and aluminium
Gearbox type:152:1 ratio, three-stage (worm and wheel first stage then two spur gear stages), all-metal gearbox construction
Shaft type:Steel, 12mm diameter by 21mm long with a 16mm long 'D' flat
Shaft support:Dual 12mm roller bearings
Weight:680g (without optional leads)

Operating Characteristics

at 12V DC:
at 24V DC:
No-load motor speed:3190rpm6390rpm
No-load speed after gearbox:21rpm42rpm
No-load current:0.15A0.3A
Maximum efficiency torque:20kg-cm40kg-cm
Maximum efficiency speed after gearbox:
Maximum efficiency current:0.8A
Stall torque:100kg-cm200kg-cm
Stall current:

Some of the above figures are theoretical and may vary slightly between motors and gearboxes. Please allow for +/-5% on most values. 

So as not to damage the gearbox ensure that it is not allowed to reach stall conditions, either mechanically or by limiting the current available to the motor (the simplest way of doing this is adding a fuse in series with the input).

Gearbox Mounting Pattern (front face)

Related Products

GLA-CU-X3 Actuator and DC Motor Remote Control Unit, Rolling Code 433MHz

GLA-CU-X3 Actuator and DC Motor Remote Control Unit, Rolling Code 433MHz

from £36.40 £43.68 inc VAT

Secure remote control system for operating DC motors and actuators between 12-36V and up to 20A. Many control features included.

Rocker-Switch Harness for Linear Actuators and other DC motors

Rocker-Switch Harness for Linear Actuators and other DC motors

from £9.25 £11.10 inc VAT

Easy to use rocker-switch and connectors for operation of direct-current motors and linear actuators. With latching and momentary versions