This wheel nut secures the road wheel to the hub flange on the host tractor or vehicle. It is a hexagon nut with a fine thread pitch, designed for the wheel stud to which it is torqued. A loose or improperly torqued nut can allow the wheel to shift on the hub, leading to stud fatigue and eventual separation. The manufacturer machines the nut to the same thread tolerance as the original assembly, ensuring consistent clamp load across all wheel positions. On reinstallation, clean the stud threads and torque the nut to the specification for the host machine.