Copper Coupling 4mm - 2 pcs.

Solarbotics GMW (GM2/3/8/9 Gear Motor Mount - ONE mount)

Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)

Copper alloy traveling nut intended for use with Tr8×8(P2) threaded rods and features a mounting flange with four holes threaded for M3 screws. Pololu 2688

A set of adapters (adapter) from the motor shaft 6 mm to 12 mm, wheel holders from RC models. Pololu 2687

These 20 mm long aluminum adapters convert a 6 mm diameter shaft to a 12 mm hex shaft that is compatible with many common hobby RC wheels. Pololu 2686

Flexible shaft coupling with a diameter of 8 mm and 10 mm. It is made of aluminum, has a diameter of 25 mm and a length of 30 mm

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack)

Adapter that allows you to easily mount the wheels on a motor with a shaft diameter of 4 mm using screws size 4-40. The hub fits both round and D-shaped shafts. Pololu 1081

This two-part aluminum assembly mounts directly to 6 mm diameter motor output shafts like those on our 37D mm gearmotors and allows you to drive most scooter, skateboard, inline skate, and other common wheels that are compatible with popular 608 ball bearings.

Pololu 2675

A set of adapters (adapter) from the popular 4 mm to 12 mm motor shaft, wheel holders from RC models. Pololu 2684

Adapter that allows you to easily mount the wheels on a motor with a shaft diameter of 6 mm using screws size 4-40. The hub fits both round and D-shaped shafts. Pololu 1083

Pololu Universal Aluminum Mounting Hub for 1/4â€l Shaft, M3 Holes (2-Pack)

Pololu Universal Aluminum Mounting Hub for 6mm Shaft, M3 Holes (2-Pack)

Pololu Universal Aluminum Mounting Hub for 5mm Shaft Pair

A two-piece aluminum adapter for transmitting wheel drive to motors with a 4mm diameter shaft. Mounting screws and set screws included. Pololu 2672