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Home / Connectors and Fasteners / Metal Universal Joint Coupling Steering Gear DIY Small Micro Car/Boat Model Motor Connector Model Accessories
Connectors and Fasteners

Attributes

Brand -
Category Industrial Small Parts / Connectors and Fasteners
Origin -
Material Aluminum Alloy
Color Silver
Shaft Diameter 4mm
Total Length 25mm
Weight 15g
Package Includes 2 x Universal Joints, 4 x Set Screws
Compatibility RC Cars, Boats, DIY Robots
Surface Treatment Anodized
Max Torque 5 kg.cm
Brand ModelTech

5 reviews

A

Anonymous

Apr 20, 2026

Rating: 5/5

Exactly as described

Shipping was fast. The anodized finish looks premium on my model.

A

Anonymous

Apr 09, 2026

Rating: 5/5

Sturdy construction

Using this for a DIY robot arm. Handles the torque well without bending.

A

Anonymous

Mar 30, 2026

Rating: 5/5

Perfect fit for my RC boat

Great quality metal. Fits the 4mm shaft perfectly. No wobble during operation.

A

Anonymous

Feb 24, 2026

Rating: 4/5

Works well for steering

Reduced friction in my steering linkage. Would buy again for future projects.

A

Anonymous

Feb 01, 2026

Rating: 4/5

Good but tight screws

The joint itself is smooth, but the set screws are a bit hard to tighten. Overall good value.

5 FAQ

Q: Do you sell replacement screws?

A: Yes, please check our store under spare parts for M3 set screws.

Q: Does this fit a 3mm shaft?

A: No, this is designed specifically for 4mm shafts.

Q: Can this be used underwater?

A: Yes, the aluminum alloy is corrosion resistant, suitable for boat models.

Q: What tool is needed for installation?

A: A small hex key or Allen wrench is required for the set screws.

Q: Is lubrication required?

A: It comes pre-lubricated, but you can add light oil for extended use.

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