National HD203 Wheel Bearing and Race Set - Rear Inner

National HD203 Wheel Bearing and Race Set

National HD203 is a taper bearing set built for driveline and axle service where precise load support matters. It uses premium-grade steel with crowned raceways and rollers to promote even load distribution across the bearing surfaces.

For wheel bearing replacement on heavy-duty axle assemblies, this National wheel bearing and race set provides the cone and cup dimensions needed for a proper service fit. It is a practical choice when searching for National HD203, 594A/592A bearing set, or a direct replacement wheel bearing and race set for axle maintenance.

Key Features

• Part number: HD203
• Part type: Wheel Bearing and Race Set
• Taper bearing cone: 594A
• Taper bearing cup: 592A
• Premium-grade steel construction
• Crowned raceways and rollers for even load distribution
• Cone bore: 3.7500 in. / 95.2500 mm
• Cup bore: 6.0000 in. / 152.4000 mm
• Width: 1.5625 in. / 39.6880 mm

Detailed Description

National HD203 is engineered as a taper bearing set for wheel-end and axle applications that require accurate bearing geometry and durable steel construction. The cone and cup are matched as 594A and 592A, with a cone length of 1.4300 in. and cup length of 1.1875 in. The bearing profile also includes a 0.3750 in. standout and specified cone and cup radii to support correct seating and load transfer.

When servicing a wheel bearing assembly on a truck, trailer, or other axle-equipped vehicle, dimensional accuracy is critical. This set is built around the listed cone bore, cup bore, and width measurements to help maintain proper fit during replacement. If you are cross-shopping National HD203 for a wheel bearing and race set, the interchange references include SKF SET403 and related 594A/592A applications. For vehicle-specific searches, use National HD203 when looking for a wheel bearing replacement for make/model applications that call for this bearing set.

What It Helps Address

• Wheel-end noise caused by worn tapered bearings
• Excessive play from bearing wear or race damage
• Rough rotation from pitted or fatigued bearing surfaces
• Service issues tied to incorrect bearing dimensions
• Axle maintenance needs on National HD203 and 594A/592A applications

Installation Notes and Tips

Verify cone and cup numbers before installation and compare all dimensions to the original bearing set. Clean the hub, spindle, and race seats thoroughly, then inspect for scoring, heat damage, or contamination before assembly. Proper bearing preload and lubrication are essential for long service life, so follow the vehicle manufacturer’s service procedure for the specific axle and wheel-end setup.

Fits 2006-2011 Honda Civic, front right is not listed for this part, so confirm application by bearing dimensions and OE numbers rather than assuming vehicle coverage. For make/model searches, National HD203 is commonly referenced in wheel bearing and race set lookup workflows for axle service.

Quality Assurance

National manufactures this taper bearing set with premium-grade steel and crowned raceways and rollers to support even load distribution. The HD203 designation, along with the 594A cone and 592A cup references, provides a clear identification point for parts matching and service verification.