Radio Active HD Coupling 4mm to 5mm

The Radio Active HD Coupling 4mm to 5mm (I-RMA5745) provides a simple, heavy-duty way to join a 4 mm shaft to a 5 mm shaft. Ideal for creating a secure mechanical link between motor and drive components, it helps deliver reliable power transfer in radio-controlled models and small engineering projects where this specific size transition is required.

With its practical 4 mm to 5 mm sizing and dependable Radio Active build quality, this coupling is a tidy solution when adapting differing shaft diameters within compact drivetrains.

Suggested Compatibility

• Joining 4 mm motor shafts to 5 mm drive shafts
• RC model drivetrains (e.g. boats) where a 4 mm to 5 mm link is needed
• General model engineering projects requiring a 4 mm to 5 mm shaft coupler