Motor Coupler - 4mm Flex - 5mm Shaft: Pro Boat

The Pro Boat PRB-1285 Motor Coupler – 4mm Flex to 5mm Shaft – is a genuine replacement part for marine RC drivetrains. It connects a 4mm flex drive cable to a 5mm motor output shaft, helping match common hardware sizes in electric RC boats.

Ideal for routine maintenance or repairs, this flex shaft coupler supports dependable power transfer between the motor and flex shaft. Use it to refresh worn driveline components with the exact Pro Boat part number PRB-1285.

Suggested Compatibility

• RC boat drivetrains that specify a 4mm flex drive cable
• Motors featuring a 5mm output shaft
• General marine setups using a 4mm flex/5mm shaft interface