3mm coupling for Robot Smart Car Wheel

The 3mm coupling for robot smart car wheels is a shaft coupling sized for 3 mm motor shafts that connects the motor to the wheel hub. It lets you fit robot car wheels to small gear motors whose shaft does not fit the wheel directly, such as N20 micro metal gear motors, and it passes the motor's torque to the wheel with a firm connection. It is useful for building or repairing small 2WD and 4WD robot cars, line followers and other wheeled robots.

3mm coupling Specifications

• Shaft size: 3 mm
• Type: motor-shaft-to-wheel coupling (hub adapter)
• Use: mounting robot smart car wheels on small DC gear motors
• Quantity: 1 coupling

3mm coupling Applications

• Small robot cars built with N20 micro gear motors (3 mm D-shaft)
• Line-follower and mini sumo robots
• Replacing a worn or lost wheel coupling
• Robotics clubs, competitions and STEM projects

What's in the Box

• 1 × 3 mm coupling for robot smart car wheels

Tip: Check the diameter and shape of your motor shaft (round or D-cut) before ordering. If the coupling uses set screws, tighten them against the flat side of a D-shaft so the wheel cannot slip, and use one coupling per driven wheel.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.