Reely Shaft Coupling for 4 mm Shaft, Outer Diameter 20 mm, 1 pc (RE-8660193)

Model builders and robotics enthusiasts often need a reliable way to connect a 4 mm motor shaft to a driven component. The Reely shaft coupling RE-8660193 provides a robust mechanical link, with an outer diameter of 20 mm and a bore for a 4 mm shaft. Its compact size suits small machinery, RC vehicles, and custom automation projects where space is limited and precise alignment matters.

Key specifications

• Shaft bore diameter: 4 mm
• Outer diameter: 20 mm
• Quantity: 1 piece
• Brand: Reely
• Model: RE-8660193

Why choose it

This coupling is designed for round shafts and is made of metal, offering durability for demanding applications. The 4 mm bore fits common small motor shafts, while the 20 mm outer diameter provides a stable connection without excessive bulk. It is a practical choice for hobbyists and engineers who need a straightforward shaft coupling without unnecessary complexity.

Ideal use cases

• Connecting motor shafts to wheels or gears in RC vehicles
• Linking drive shafts in small robotic arms or actuators
• Coupling shafts in model boats, aircraft, or industrial prototypes
• Replacing worn couplings in small machinery

Good to know

The coupling is sold individually, so you can order exactly the number you need. It is intended for round shafts with a 4 mm diameter. The metal construction provides strength, but specific material composition is not specified by the manufacturer.