A
Anonymous
Apr 16, 2026
Rating: 5/5
Great Value
Much cheaper than local hobby shop and same quality.
Description
Aluminum alloy rigid coupling, motor shaft diameter adapter, fixed connector for RC boat, car, and aircraft metal models
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | 6061 Aluminum Alloy |
| Color | Silver |
| Motor Shaft Diameter | 5mm |
| Driven Shaft Diameter | 3mm |
| Outer Diameter | 12mm |
| Total Length | 25mm |
| Weight | 8.5 grams |
| Surface Finish | Anodized |
| Fixing Method | Dual Set Screws |
| Compatibility | RC Boats, Cars, Aircraft |
5 reviews
A
Anonymous
Apr 04, 2026
Rating: 4/5
Good Adapter
Works well but set screws were a bit tight to thread initially.
A
Anonymous
Mar 14, 2026
Rating: 5/5
Excellent Precision
Machining is top notch. Fits my motor shaft perfectly without wobble.
A
Anonymous
Feb 16, 2026
Rating: 5/5
Perfect Step Down
Exactly what I needed to connect my 5mm motor to 3mm prop shaft.
A
Anonymous
Feb 01, 2026
Rating: 5/5
Strong Material
Feels very solid. No flex under load during high speed runs.
5 FAQ
Q: Does this come with screws?
A: Yes, set screws are included in the package.
Q: Can I use this for a 4mm shaft?
A: No, this model is specifically for 5mm to 3mm adaptation.
Q: Is this flexible or rigid?
A: This is a rigid coupling designed for fixed alignment.
Q: Do I need glue?
A: No, the set screws provide sufficient holding force for most applications.
Q: What is the max RPM?
A: It is rated for standard RC motor speeds up to 30000 RPM.
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