Can I control the speed of this 12V gear motor?

Yes, you can control the speed of this 12V gear motor by using a standard PWM (Pulse Width Modulation) motor speed controller. However, please note that reducing the speed below the rated 7 RPM will also proportionally reduce the motor's torque output.

How do I reverse the rotation direction of the shaft?

You can easily reverse the rotation direction by swapping the positive and negative connections of your 12V DC power supply. For automated projects, you can achieve this electronically by routing the power through an H-Bridge motor driver module.

What is the diameter of the output shaft, and is it easy to attach gears?

The output shaft is a standard 6mm D-shaft (with a 5.5mm flat edge) and is 15mm long. The flat "D" shape is specifically designed to accommodate set screws, preventing attached gears, wheels, or pulleys from slipping under high torque.

Are the internal gears made of plastic or metal?

The internal gears of the GB37 reduction gearbox are made entirely of high-strength metal. This all-metal construction is crucial for handling the massive 20kg.cm rated torque without the gear teeth stripping or breaking under heavy loads.

12V 520 Micro Gear Motor | 7 RPM High Torque D-Shaft

Name: 12V 520 Micro Gear Motor | 7 RPM High Torque D-Shaft
Brand: Sun Cheong Computer Company Limited
SKU: 21PS002344-7RPM
Price: 167.0 TWD
Availability: InStock

Short Product Description

The 12V 520 Micro Gear Motor (GB37-520) is a heavy-duty, ultra-low speed (7 RPM) power solution designed for DIY robotics and industrial automation. Featuring an all-metal gearbox, a standard 6mm D-shaft, and an impressive 20kg.cm rated torque, this reversible motor effortlessly handles heavy lifting and precise positioning tasks. Available for instant pickup at Sun Cheong Computer Co. Ltd.(新昌電腦有限公司) in Sham Shui Po, our technical staff can help you pair this motor with the perfect PWM speed controller for your custom mechanical builds.

Key Features

Ultra-Low 7 RPM Speed: Provides highly controlled, slow rotational movement perfect for precision tracking and heavy lifting.
Massive 20kg.cm Torque: The high-ratio reduction gearbox delivers exceptional pushing and pulling power for demanding mechanical tasks.
All-Metal Gear Train: Built with a robust metal gearbox to prevent gear stripping and ensure long-term industrial reliability.
Standard 6mm D-Shaft: Features a 15mm long, 6mm diameter D-shaped output shaft for secure, slip-free attachment of pulleys and gears.
PWM & Reversible Ready: Fully compatible with PWM speed controllers and easily reversible by swapping the DC power polarity.
Secure M3 Mounting: The faceplate includes six M3 threaded holes (3.5mm depth) for rock-solid installation in custom chassis.

Full Product Description

High-Torque Power for Heavy-Duty Automation

This 12V 520 Micro Gear Motor delivers an exceptional 20kg.cm of rated torque at a slow, precise 7 RPM, making it ideal for heavy lifting in DIY automation projects. By drastically reducing the speed of the internal DC motor, the attached GB37 gearbox multiplies the output force, allowing you to drive heavy automated curtains, motorized display turntables, or custom robotic lifting arms. Its steady, low-speed rotation ensures that your mechanical components move smoothly without the jerky, uncontrollable motions associated with high-speed motors.

All-Metal Gearbox Durability

The integrated GB37 tower-style reduction gearbox is constructed entirely from durable metal gears, ensuring a long lifespan and resistance to stripping under heavy loads. Unlike cheaper motors that utilize plastic internal gears, this All-Metal Gear Motor can safely handle a maximum limit load of up to 50kg.cm during brief power spikes. This rugged construction guarantees reliable, continuous operation in demanding environments, such as automated feeding machines or heavy-duty smart home locking mechanisms.

Reversible & PWM Speed Controllable

You can easily reverse the motor's direction by swapping the positive and negative power inputs, and finely adjust its speed using a standard PWM controller. This dual-functionality allows for highly flexible integration into complex Arduino or Raspberry Pi projects using an H-Bridge motor driver. The motor features clearly marked positive (red dot) and negative soldering terminals on the back, making it incredibly straightforward to wire up your custom forward and reverse control circuits.

Pro Tip from Our Technicians

Our Sham Shui Po technical team strongly advises using a dedicated 12V motor driver with a high current rating to prevent stalling when pushing this 7 RPM Gear Motor near its physical limits. While the motor can technically handle a 50kg.cm limit load, running it continuously at this extreme resistance will cause the coils to overheat and drastically shorten its lifespan. Always secure the motor using the six M3 threaded mounting holes on the faceplate to prevent the immense torque from twisting the motor out of its mounting bracket.

Technical Specifications

Brand: Yixing Motor (一兴电机)
Model: GB37-520
Product Type: Micro DC Gear Motor
Operating Voltage: 12V DC
Output Speed: 7 RPM
Rated Torque: 20 kgf.cm
Maximum Limit Load: 50 kgf.cm
No-Load Current: 0.05A - 0.15A
Power Rating: 3.6W - 7.8W
Output Shaft: 6mm D-Shaft (5.5mm at flat edge)
Shaft Length: 15mm
Gearbox Type: All-Metal Tower Reduction Box
Weight: 144g - 170g

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Can I control the speed of this 12V gear motor?Yes, you can control the speed of this 12V gear motor by using a standard PWM (Pulse Width Modulation) motor speed controller. However, please note that reducing the speed below the rated 7 RPM will also proportionally reduce the motor's torque output.
How do I reverse the rotation direction of the shaft?You can easily reverse the rotation direction by swapping the positive and negative connections of your 12V DC power supply. For automated projects, you can achieve this electronically by routing the power through an H-Bridge motor driver module.
What is the diameter of the output shaft, and is it easy to attach gears?The output shaft is a standard 6mm D-shaft (with a 5.5mm flat edge) and is 15mm long. The flat "D" shape is specifically designed to accommodate set screws, preventing attached gears, wheels, or pulleys from slipping under high torque.
Are the internal gears made of plastic or metal?The internal gears of the GB37 reduction gearbox are made entirely of high-strength metal. This all-metal construction is crucial for handling the massive 20kg.cm rated torque without the gear teeth stripping or breaking under heavy loads.
Can I test this motor and buy matching controllers at your Hong Kong store?Yes, the 12V 520 Micro Gear Motor is in-stock and available for immediate pickup at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po. Our technical staff can help you test the motor and select the appropriate PWM controllers and H-Bridge drivers for your project.

Target Users / Applications

DIY Robotics Builders: Constructing heavy-duty robotic arms or tank treads that require immense low-speed pushing power and all-metal durability.
Smart Home Modders: Automating heavy living room curtains or building concealed TV lift mechanisms that rely on slow, steady 7 RPM rotational force.
Industrial Prototypers: Designing custom automated feeding machines, conveyor belts, or packaging equipment that demand reliable 24/7 high-torque operation.

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12V 520 Micro Gear Motor | 7 RPM High Torque D-Shaft (GB37)