Pololu Universal Aluminum Mounting Hub for 5mm Shaft, #4-40 Holes (2-Pack)

These universal aluminium mounting hubs from Pololu are designed to securely couple custom wheels, mechanisms, and other components to 5 mm diameter motor shafts — including round and D-shaped shafts. Each hub features four #4-40 mounting holes for attaching wheels or custom parts, and a #4-40 hex set screw locks the hub firmly to the shaft.

The hubs are compatible with most stepper motors that have a 5 mm output shaft, and they work with Pololu's 60 mm, 70 mm, 80 mm, and 90 mm wheels.

Key Features

• 5 mm Shaft Compatibility – Fits round and D-shaped shafts
• 4× #4-40 Mounting Holes – Attach wheels, brackets, or custom mechanisms
• Set Screw Locking – #4-40 hex set screw for secure shaft coupling
• Aluminium Construction – Lightweight and durable
• Hex Wrench Included – 0.05" wrench for the set screws

Ideal For

• Mounting custom wheels to stepper motors
• Coupling mechanisms to 5 mm motor shafts
• Robotics and motorised platform builds

Package Contents

• 2× Universal Aluminium Mounting Hubs (5 mm bore)
• 2× #4-40 Hex Set Screws
• 1× 0.05" Hex Wrench