Motor Coupler 5mm (Motor) / 4.7mm (Flexshaft)

Motor Coupler 5mm (Motor) / 4.7mm (Flexshaft)

This Motor Coupler is a precision machined connector designed to join a 5mm motor shaft to a 4.7mm flexible drive shaft (flexshaft) in RC boat and RC aircraft applications. The coupler transmits torque from the motor to the flexshaft efficiently while accommodating minor misalignment between the motor and drive shaft, reducing stress on bearings and extending drivetrain life.

• Motor Shaft Bore: 5mm
• Flexshaft Bore: 4.7mm
• Material: CNC-machined aluminium alloy or brass – lightweight and corrosion-resistant
• Fastening: Grub screws (set screws) on both ends for secure shaft retention
• Application: RC boats (inboard drive systems), RC aircraft with flexshaft drive, and any RC drivetrain requiring a 5mm to 4.7mm shaft coupling
• Advantage: Accommodates minor shaft misalignment, reduces vibration transmission, and provides a secure, slip-free torque connection

A critical drivetrain component for RC boat and flexshaft drive builds — the correct motor coupler ensures efficient, vibration-free power transfer from your motor to the flexshaft, protecting both the motor bearings and the flexshaft from the stress of misalignment and torque shock.