How do I reverse the direction of this threaded shaft motor?

You can reverse the motor's direction by simply swapping the positive and negative connections of your 12V DC power supply. For automated projects, you should route the power through an H-Bridge motor driver, which allows a microcontroller like an Arduino to reverse the polarity electronically.

Can I run this 12V motor using a 5V power supply?

Yes, you can run this 12V motor on a 5V power supply, but it will operate at a significantly reduced speed and output much less torque. For optimal performance and to prevent stalling under load, we highly recommend providing a stable 12V DC power source.

What is the thread pitch of the 55mm output shaft?

The 55mm output shaft features a standard M4 metric thread with a pitch of 0.7mm. This means that for every full 360-degree rotation of the motor, a standard M4 nut threaded onto the shaft will travel exactly 0.7mm linearly.

Are the gears inside the gearbox made of plastic or metal?

The gears inside this micro reduction gearbox are made entirely of metal (brass and steel). This all-metal construction provides superior durability and allows the tiny motor to generate high torque without stripping the gear teeth under physical resistance.

Can I purchase this micro gear motor in bulk at your Hong Kong store?

Yes, you can purchase the 12V 50RPM Micro Gear Motor in bulk quantities at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po. Our physical store caters to STEM educators, DIY robotics builders, and electronic hobbyists.

12V 50RPM Micro Gear Motor | M4 x 55mm Shaft

Name: 12V 50RPM Micro Gear Motor | M4 x 55mm Shaft
Brand: Sun Cheong Computer Company Limited
SKU: 21PS002222
Price: 122.0 TWD
Availability: InStock

Short Product Description

The 12V 50RPM Micro Gear Motor is an ultra-compact power solution designed for precise linear motion in DIY robotics and miniature automation projects. Featuring an exposed all-metal gearbox and a 55mm long M4 threaded shaft, this motor translates rotational force directly into powerful push-pull movements. 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 provide expert advice on pairing this motor with the right H-bridge drivers for your custom STEM builds.

Key Features

Integrated M4 Threaded Shaft: Features a 55mm long, 0.7mm pitch threaded rod that acts as a built-in lead screw for linear motion projects.
Steady 50 RPM Output: Geared down to 50 revolutions per minute at 12V, providing a perfect balance of high torque and controllable speed.
All-Metal Gear Train: The exposed reduction gearbox is constructed from durable brass and steel, ensuring long-lasting performance under heavy loads.
Ultra-Compact Footprint: The motor and gearbox combined measure just 25mm in length, easily fitting into the smallest robotic chassis.
Simple 2-Wire Control: Easily reverse the motor's direction by swapping the positive and negative 12V DC power inputs.
Standard Mounting Holes: Equipped with two M1.6 threaded mounting holes on the faceplate for secure, vibration-free installation.

Full Product Description

Precise Linear Motion for Miniature Robotics

This 12V Micro Gear Motor transforms standard rotational power into precise linear motion, making it the perfect core component for DIY linear actuators and miniature sliding mechanisms. Operating at a steady 50 RPM, it provides highly controlled, high-torque movement ideal for 3D printer upgrades, custom camera sliders, or automated smart home locks. The integrated M4 threaded shaft eliminates the need for external couplings, saving valuable space inside tight project enclosures.

High-Torque All-Metal Gearbox

The motor features a durable, exposed brass and steel gear train housed within a tiny 12mm x 10mm cross-section. This all-metal reduction gearbox significantly multiplies the torque of the base 16mm DC motor, ensuring it can push or pull surprisingly heavy loads without stalling or stripping gears. The 55mm long shaft utilizes a standard 0.7mm thread pitch, allowing you to easily attach standard M4 nuts or custom 3D-printed carriages to drive your mechanical assemblies.

Pro Tip from Our Technicians

To control the extension and retraction of a nut along this M4 Threaded Shaft Motor, our Sham Shui Po technical team strongly advises using an H-Bridge motor driver (such as an L298N or L293D). By reversing the polarity of the 12V DC power supply, you can seamlessly switch the motor between forward and reverse. Furthermore, we highly recommend installing physical limit switches (micro-switches) at both ends of your mechanical track to cut the power automatically, preventing the motor from stalling and burning out when the carriage reaches the end of the thread.

Technical Specifications

Product Type: Micro DC Gear Motor (N20 Style)
Operating Voltage: 12V DC
Output Speed: 50 RPM
Output Shaft Type: Threaded Lead Screw
Shaft Diameter: M4 (4mm)
Shaft Length: 55mm (±1mm)
Thread Pitch: 0.7mm
Motor Body Length: 16mm
Gearbox Length: 9mm
Gearbox Cross-Section: 12mm x 10mm
Mounting Holes: 2 x M1.6 (9mm spacing)

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

How do I reverse the direction of this threaded shaft motor?You can reverse the motor's direction by simply swapping the positive and negative connections of your 12V DC power supply. For automated projects, you should route the power through an H-Bridge motor driver, which allows a microcontroller like an Arduino to reverse the polarity electronically.
Can I run this 12V motor using a 5V power supply?Yes, you can run this 12V motor on a 5V power supply, but it will operate at a significantly reduced speed and output much less torque. For optimal performance and to prevent stalling under load, we highly recommend providing a stable 12V DC power source.
What is the thread pitch of the 55mm output shaft?The 55mm output shaft features a standard M4 metric thread with a pitch of 0.7mm. This means that for every full 360-degree rotation of the motor, a standard M4 nut threaded onto the shaft will travel exactly 0.7mm linearly.
Are the gears inside the gearbox made of plastic or metal?The gears inside this micro reduction gearbox are made entirely of metal (brass and steel). This all-metal construction provides superior durability and allows the tiny motor to generate high torque without stripping the gear teeth under physical resistance.
Can I purchase this micro gear motor in bulk at your Hong Kong store?Yes, you can purchase the 12V 50RPM Micro Gear Motor in bulk quantities at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po. Our physical store caters to STEM educators, DIY robotics builders, and electronic hobbyists.

Target Users / Applications

STEM Robotics Students: Building miniature forklift beds or robotic gripper arms that require precise, slow-moving linear actuation.
Smart Home DIYers: Creating custom, hidden electronic locking mechanisms for small drawers or jewelry boxes using an M4 nut as a sliding deadbolt.
Scale Model Makers: Animating moving parts on scale dioramas, such as opening hangar doors or extending miniature radar arrays.

Item added to your cart

12V 50RPM Micro Gear Motor | M4 x 55mm Threaded Shaft