Brass Hex Shaft Coupling for DC Gear Motors, 4mm x 30mm

This 30 mm brass hex shaft coupling connects a 4 mm motor output shaft directly to robot wheels and mechanical assemblies. It provides a firm, reliable mechanical link that prevents slippage in driven drivetrains. It is ideal for learners, makers, and hobbyists building custom wheeled robotics projects.

Reliable drive connection

Featuring an internal hole diameter of 4 mm, this coupler allows DC gear motors to securely drive wheels and custom mechanical linkages.

Durable brass design

Constructed from solid brass, the coupling measures 30 mm in total length with a 12 mm edge-to-edge hexagonal profile.

Fastening specifications

The coupler includes a 4 mm screw aperture on the side to fasten the motor shaft firmly in place.