Why do you need to change the axle nut when you change the hub bearing?

When changing a hub bearing, it's essential to replace the axle nut because the original nut is often designed for a single-use application. Reusing the old nut can lead to improper torque, which may result in loosening or failure of the bearing assembly. Additionally, the nut may have worn threads, compromising the integrity of the connection. Installing a new nut ensures a secure and reliable fit, maintaining the overall safety and performance of the vehicle.