J Perkins M4 Brass Marine Insert Coupling 5511878

The J Perkins M4 Insert Coupling, part number 5511878, is a brass marine insert coupling for model boat drive systems. It provides a link between a motor output and a propeller shaft, with an M4 thread for the stated application.

Machined from solid brass, this coupling is intended for use in wet environments and offers corrosion resistance when exposed to fresh or salt water. Its ribbed, splined shaft section is designed to press into flexible universal joint couplings or rubber drives, helping create a secure connection during operation.

Features

• Ribbed, splined insert design helps resist drive slip under torque.
• Solid brass construction provides corrosion resistance in marine environments.
• Helps reduce drivetrain movement between motor and propeller shafts.

Suggested compatibility includes model boat drive systems using flexible universal joints or rubber drive components. The insert design supports smooth power transfer through the drivetrain while maintaining the connection between the motor and propeller shaft.