OTR 1.5" Wheel Bearing Cup and Cone Set, 3.5" Bore x 6.0" OD. This matched cup-and-cone kit addresses the root causes of wheel-end failure by restoring correct rolling geometry and even load distribution across the wheel bearing surfaces. Designed to the HM518445/HM518410 dimensional standard, the set replaces worn inner and outer races and returns the axle end to specified bore and outer-diameter dimensions so hubs turn with minimal friction and predictable torque. For fleet operators and maintenance shops, installing a matched set reduces the need for repetitive adjustments and unscheduled corrective work that arise when single, mismatched components are used. Precision-machined raceways and rollers maintain consistent contact patterns under heavy loads, which helps control operating temperature and bearing wear rates during long-haul and loaded-stop cycles. Selecting a matched bearing set simplifies inventory management by consolidating two wheel-end items into a single part number for common service events, enabling faster turnaround at the bay and shorter vehicle out-of-service time. The kits dimensional conformity to industry taper-roller standards supports repeatable preload and endplay settings during installation, reducing wheel-end rework and follow-up inspections. Technicians replacing degraded cones and cups can expect restored wheel rotation smoothness and improved resistance to premature fatigue that can lead to axle repairs. For fleet maintenance planning, use of matched sets contributes to more predictable maintenance intervals and steadier lifecycle costs by reducing unplanned wheel-end replacements. Packaging and labeling identify the cup and cone pair so technicians can complete the wheel-end job without sourcing additional races or chasing matched components.