Stainless Steel Flex Collet Coupler 3.17–6MM | RC Boat Parts
Stainless Steel Flex Collet Coupler 3.17–6MM | RC Boat Parts
Stainless Steel Flexible Coupling Collet Coupler for Model Electric Boats
Upgrade your RC or model electric boat build with this precision-machined stainless steel flexible coupling collet coupler. Engineered to connect motor shafts to flex shafts with minimal play, this coupler ensures smooth, reliable power transfer for improved performance on the water. Available in four shaft sizes to suit a wide range of electric boat setups.
Key Features
- Material: High-quality stainless steel for durability and corrosion resistance
- Flexible Design: Absorbs minor misalignments between motor shaft and flex shaft for smoother operation
- Four Size Options: 3.17mm, 4mm, 5mm, and 6mm motor shaft — all connect to a 4mm flex shaft
- Collet-Style Grip: Secure clamping mechanism prevents slippage under load
- Versatile Compatibility: Ideal for RC model electric boats and similar motorized model applications
- Package Includes: 1 Set
Specifications
| Material | Stainless Steel |
| Motor Shaft Sizes | 3.17mm / 4mm / 5mm / 6mm |
| Flex Shaft Compatibility | 4mm flex shaft (all sizes) |
| Package Quantity | 1 Set |
| Country of Origin | Made in China |
Size Compatibility Guide
- 3.17mm motor shaft → 4mm flex shaft
- 4mm motor shaft → 4mm flex shaft
- 5mm motor shaft → 4mm flex shaft
- 6mm motor shaft → 4mm flex shaft
Note: Please allow slight dimensional differences due to manual measurement. Dimensions listed are for reference only. Color may vary slightly from images due to monitor display differences.
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Frequently Asked Questions
Q: What flex shaft size is compatible with all coupler sizes in this set?
A: All four coupler sizes (3.17mm, 4mm, 5mm, and 6mm motor shaft variants) are designed to connect to a 4mm flex shaft, making this a versatile solution for most standard model electric boat drivetrain configurations.
Q: Is this flexible coupling suitable for use in water-exposed environments?
A: Yes. The coupler is constructed from stainless steel, which offers excellent resistance to corrosion and moisture — making it well-suited for RC boat and other marine model applications where exposure to water is expected.
Q: How do I choose the correct coupler size for my build?
A: Simply measure your motor's output shaft diameter. Select the coupler size that matches your motor shaft (3.17mm, 4mm, 5mm, or 6mm) — the flex shaft side is universally sized at 4mm across all variants.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.