Hex Coupler for RC Wheel (Pack of 1 Pair)

The Hex Coupler for RC Wheel is a brass adapter measuring 8mm inner diameter, 12mm outer diameter, and 18mm length, with a 14mm hex socket output and dual side grub screws, designed to connect round motor shafts to hex-drive RC wheels. This hex coupler solves a fundamental interface mismatch in robot car builds — DC motors and gear motor axles output on a round shaft, while most RC and robot car wheels use a hexagonal socket hub that requires a matching hex interface, and this hex wheel coupler bridges those two standards in a single compact component.

The rc wheel hub’s brass construction gives it two specific advantages over aluminum or plastic alternatives — brass does not gall (cold-weld) against steel motor shafts the way aluminum can under repeated grub screw clamping and unclamping, and brass machines cleanly to precise tolerances for the 8mm bore and 14mm hex socket fit. The dual side grub screws secure the hex coupler 8mm to the motor shaft from two opposing sides rather than one, distributing the clamping force evenly around the shaft circumference and significantly reducing the risk of slippage under drive torque compared to a single grub screw design.

this brass hex coupler requires correctly sized grub screws to be tightened firmly — under-tightened screws will cause the coupler to slip on the shaft under motor torque, especially at higher speeds. Available from StemVolt, offering quality robotics parts and DIY kits at competitive prices. This hex coupler for RC wheel is ideal for DIY projects, robotics applications and STEM models.

Related Product:

• Checkout Brass Drill Chuck Set 

Features:

• Bridges 8mm round motor shaft to 14mm hex RC wheel socket
• Brass body — no galling on steel shafts, clean precision bore
• Dual grub screws distribute clamping force for slip-free drive
• Suits robot car 4WD builds with hex-socket drive wheels

Technical Specifications:

Applications:

• Hex Coupler used for 4WD robot car wheel shaft adapter build
• College project uses hex wheel coupler for shaft-wheel interface demo
• India robot uses rc wheel hub for DC motor to hex wheel connection
• RC car uses hex coupler 8mm for motor axle to hex wheel mount
• DIY robot uses brass hex coupler for dual grub screw drive build

Package Includes:

• 1 x Hex Coupler for RC Wheel