Two Pack Heavy Duty Universal Joint Shaft Couplings 4mm To 4mm Inner Diameter Rotatable Steering Shaft U Joints With Screws For RC Cars Robots Boats And Other Drive System Projects

Two-Pack Heavy Duty Universal Joint Shaft Couplings 4mm to 4mm
✔️ 9x23 mm OD x H (0.35x0.91 in), 4 mm bore (0.16 in), 45# steel

These universal rotatable steering shaft joints provide smooth torque transmission between a motor and steering mechanism in RC cars, boats, robots, and other drive systems. Typical applications include remote-controlled models and compact automation projects.

✅ 2-piece pack of universal joint shaft couplings
✅ Size 9x23 mm OD x H with 4 mm bore
✅ Made from 45# steel with silver tone finish
✅ Side holes accept screws; tighten with hex wrench (wrench not included)

💡 What is a universal joint shaft coupling used for?

It is handy for transmitting rotational power in drive systems where space is tight and alignment isn’t perfect.

- transfers torque across angled drives in hobby RC and robotics
- allows angular misalignment while maintaining steering/control
- fits 4 mm bore universal joints for compact drive systems
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