Double Pass Brass Universal Adapter Coupling 3mm x 5mm

Double Pass Brass Universal Adapter Coupling 3mm × 5mm

The coupling is engineered to link 3mm and 5mm shafts with stable rotational output in compact systems. Its brass body supports accurate alignment, making it ideal for reliable motor shaft coupling tasks. Additionally, this setup works well where a strong alternative to plastic motor coupling components is required. Because the design focuses on smooth torque delivery, the coupling performs efficiently in miniature builds that depend on precision.

Once the shafts are inserted, tightening the included M3 screws provides a secure grip. This reduces rotational slip and ensures the coupling remains steady under load. It is especially useful in robotics, RC drive mechanisms, and tight-motion modules where consistent performance matters. Overall, this durable assembly serves as a dependable point for compact engineering layouts.

Technical Details

• Material: Brass
• Bore Sizes: 3mm and 5mm
• Body Length: 20 mm
• Outer Diameter: 9 mm
• Locking Hardware: M3 compression screws (4 pcs)
• Coupler Type: Rigid cylindrical sleeve
• Weight: 8 g
• Surface Color: Gold brass finish

Features

• Transitions 3mm motor outputs to 5mm rotational components
• Ensures smooth drive performance 
• Brass machining provides durability 
• Four-point screw layout improves grip and alignment
• Compact size suited for dense mechanical housings

Applications

• RC propulsion conversion setups 
• Robotic gearbox shaft adaptation
• Light prototype drivetrain upgrades
• Small pulley or gear interface mechanisms
• Instrumentation and micro-drive alignment tasks

Physical Attributes

• Coupler Length: 20 mm
• Body Diameter: 9 mm
• Bore Diameters: 3 mm and 5 mm
• Thread Type: M3
• Included Screws: 4 pcs
• Total Mass: 8 g
• Construction: Solid rigid body
• Finish Quality: Smooth machined brass exterior

Package Includes

• 1 × Double Pass Brass Coupling (3mm × 5mm)
• 4 × M3 Compression Screws