2 Pack CNC Stainless Steel RC Flex Collet Coupler Flexible Drive Shaft Locker for DIY RC Boat Submarine 5mm to 4mm Optional 3.17mm 4mm 5mm 6mm Sizes Durable Motor Shaft Connector

Two-Pack Stainless CNC RC Flex Collet Coupler 5mm to 4mm
✔️ 2 pcs stainless steel couplings; motor to 4mm shaft; 3.17/4/5/6mm

These durable stainless steel couplers are designed to join a motor shaft to a drive shaft in DIY RC electric boats and submarines. They provide secure, compact connections in tight spaces.

✅ Material: Stainless steel
✅ Connects to Flexible Shaft: 4mm
✅ Connects to Motor Shaft: 3.17mm / 4mm / 5mm / 6mm (optional)
✅ Includes: 2x Flexible Coupling, 2x Grub Screw

💡 What is a flexible drive shaft coupling used for in RC models?

A handy device for joining motor and drive shafts in compact RC setups, allowing slight misalignment.

- transfers torque between motor shaft and drive shaft
- stainless steel construction resists water corrosion and wear
- available in 3.17mm, 4mm, 5mm, 6mm motor shaft sizes