hubtoshaft

Hub to shaft refers to the interface in mechanical assemblies where a hub—a central rotating component used to mount or drive a peripheral element such as a wheel, pulley, gear, or rotor—is connected to a cylindrical shaft that supplies torque. The connection must transmit torque, resist axial and radial loads, and maintain alignment during operation. Common methods to attach a hub to a shaft include a keyed or splined joint, a set-screw or clamping connection, a press fit, or a combination of these. Keyed joints use a metal key in a slot on the shaft and hub to prevent relative rotation; splined joints offer higher torque capacity with multiple ridges; set screws tighten against the shaft to lock the hub in place; clamping hubs use a collar that tightens around the shaft.

One may also use a shaft collar, adapters, or rigid or flexible couplings to accommodate misalignment, axial movement, or thermal expansion. Selection depends on torque, speed, misalignment, response to shocks, ease of assembly, and maintenance requirements. Materials range from steel and stainless steel to aluminum alloys, with coatings and surface finishes to reduce wear and corrosion. Lubrication, bearing support, and proper length engagement are important to avoid slippage or fatigue.

Applications include automotive wheel hubs, industrial pulleys and gears, rotor hubs in electric machines, and machinery where a rotating hub must drive a connected shaft. Design and installation should follow relevant standards and manufacturer guidelines to ensure safety and reliability.