12mm Hex Wheel Hub Adapter 4 – 8mm Bore (Pair) – MakerBotics

$6.88 Inc. GST

This brass coupling converts a 4mm, 6mm, or 8mm motor shaft into a 12mm hex profile, providing an 18mm overall length for chassis-to-wheel clearance. It mounts to the shaft flat via two M4 grub screws to prevent rotational slippage under torque. Applications include mobile robotics, automated systems, and utility vehicles where drive assemblies interface with 12mm hex hub wheels. The unit is compatible with 37mm spur, 36mm planetary, and 42mm planetary gear motors.

Description

Technical Overview

Machinists and builders actively choose these 12mm Hex Wheel Hub adapters to transform hardware assemblies. Specifically, this component converts a standard 4mm, 6mm, or 8mm cylindrical motor shaft into a 12mm hexagonal profile. Furthermore, these robust adapters feature an overall total length of 18mm. Because of this layout, the hardware successfully accommodates a majority of standard wheel-motor configurations. In addition, this physical configuration ensures proper, reliable spacing between the vehicle chassis and the wheel assemblies. To secure the connection, each individual coupling utilizes two distinct M4 grub screws. Consequently, these screws clamp the adapter directly onto the flat section of the rotating motor shaft. As a direct result, this mechanical design completely prevents rotational slippage under high torque loads. Therefore, the system maintains perfect mechanical alignment throughout intense machine operation.

Applications

Engineers widely integrate these couplings into diverse mobile robotics platforms. For instance, teams frequently deploy them within custom automated systems and small-scale utility vehicles. In addition, these specialized components allow standard drive assemblies to interface directly with RC-style wheels. This mechanical connection works perfectly because the wheels feature a standard 12mm hex hub receptacle. Moreover, the hubs perfectly complement 37mm spur gear motors as well as 36mm planetary gear motors. The 12mm Hex Wheel Hub Adapters also interface seamlessly with larger 42mm planetary geared motors. Accordingly, they serve as a highly practical connection method for 120mm robot wheels. Ultimately, this structural versatility allows developers to construct fully autonomous wheel configurations with minimal hardware modification.

Maker Store Tips and Tricks

Align the M4 grub screws precisely with the flat portion (D-flat) of the motor shaft to prevent shaft slipping during operation.
Apply a small amount of medium-strength thread-locking compound to the grub screws to prevent loosening caused by high vibration or continuous reversing.