5mm to 5mm Rigid Brass Shaft Coupling

Name: 5mm to 5mm Rigid Brass Shaft Coupling | Motor Connector
Brand: Sun Cheong Computer Company Limited
Price: 12.0 HKD
Availability: InStock

Short Product Description

This 5mm to 5mm rigid brass shaft coupling is designed for precise mechanical transmission in DIY robotics, RC models, and custom machinery. Machined from high-quality brass for excellent wear and corrosion resistance, it securely connects 5mm motor shafts to 5mm drive rods without flexing. The complete kit includes four grub screws and a hex wrench for immediate, slip-free installation, ensuring stable rotational torque for your maker projects.

Key Features

Zero-Backlash Connection: Rigid design ensures direct and precise torque transfer without any rotational play.
High-Quality Brass: Offers excellent wear resistance, corrosion protection, and stronger threads than aluminum.
Precision Machined: Exact 5mm inner diameter ensures a snug, wobble-free fit on standard motor shafts and rods.
4-Point Fixing: Utilizes four grub screws (two on each side) to securely clamp down on the shafts and prevent slipping.
Complete Installation Kit: Includes the brass coupling, four fixing screws, and a matching hex wrench for immediate setup.

Full Product Description

Secure Power Transmission for 5mm Shafts

This rigid coupling provides a solid, zero-backlash connection between two 5mm shafts. Unlike flexible couplings that absorb vibration but can introduce rotational play, this rigid brass connector ensures that 100% of the motor's rotational torque is transferred directly to the drive rod or lead screw. This makes it an essential component for precision-driven DIY projects, such as custom CNC machines, 3D printers, and robotic drive trains where exact positioning is required.

Durable Brass Construction for Long-Term Use

Machined from high-quality solid brass, this coupling offers superior durability and wear resistance compared to standard plastic or aluminum alternatives. The brass material naturally resists corrosion and provides a strong thread engagement for the set screws, ensuring they do not strip easily when tightened against hard steel motor shafts. The smooth, high-precision finish guarantees a perfect fit for standard 5mm components.

Technician Tip

To ensure a perfectly concentric rotation and prevent wobbling, tighten the four grub screws evenly in a cross-pattern. If your motor shaft has a flat "D" shape, align one of the grub screws directly over the flat section for maximum grip. If you are building a custom robotic chassis and need matching 5mm DC motors or steel drive rods, visit our physical store at Sun Cheong Computer Co. Ltd. in Sham Shui Po to test the fitment in person.

Technical Specifications

Coupling Type: Rigid Shaft Coupling
Inner Diameter (ID): 5mm to 5mm
Outer Diameter (OD): Approx. 9mm
Total Length: Approx. 20mm
Material: High-Quality Brass
Fixing Method: 4x Grub Screws (Set Screws)
Included Accessories: 1x Hex Wrench, 4x Screws

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

Is this coupling flexible or rigid?

This is a rigid coupling. It does not bend or flex, meaning it transfers 100% of the rotational force directly to the connected shaft. It requires the two connected shafts to be perfectly aligned to prevent binding.

Why should I choose a brass coupling over an aluminum one?

Brass is denser and generally offers better wear resistance and stronger threads than aluminum. This allows you to tighten the grub screws more securely against hard steel motor shafts without stripping the threads inside the coupling.

How do I prevent the screws from loosening during high-speed rotation?

For high-speed or high-vibration applications, we highly recommend applying a small drop of medium-strength threadlocker (like Loctite Blue) to the grub screws before tightening them down.

Will this fit a shaft that is slightly larger than 5mm?

No, this coupling is precision-machined to exactly 5mm. If your shaft is even slightly oversized, it will not fit. Ensure your motor shaft or drive rod is exactly 5.0mm in diameter.

Can I buy matching 5mm DC motors at your Sham Shui Po store?

Yes, we stock a wide variety of DC motors, stepper motors, and metal rods with 5mm shafts at our Sham Shui Po physical store. You can bring your project in to ensure perfect compatibility.

Target Users / Applications

Robotics Hobbyists: Connecting 5mm DC gear motors to wheel axles on custom-built robotic chassis.
RC Boat Builders: Joining the internal brushless motor shaft to the external propeller drive shaft securely.
3D Printer & CNC DIYers: Extending 5mm Z-axis lead screws or connecting stepper motors to drive mechanisms where zero backlash is required.
Mechanical Prototypers: Building custom gearboxes or motorized displays requiring reliable, slip-free rotational joints.