National Oil Seal

About National Oil Seal

When it comes to wheel-end integrity and precision sealing, few names carry as much weight as National Oil Seal. With more than 75 years of engineering experience behind it, National has earned a reputation as one of the most respected brands in the automotive aftermarket — a legacy built on dependable performance across millions of passenger cars, trucks, and heavy-duty vehicles.

Originally developed under the Federal-Mogul umbrella, National Oil Seal is now distributed through DRiV Motorparts, giving it access to a world-class engineering network and distribution infrastructure. The brand's part numbering system has become so widely adopted that it is used as an industry-wide reference standard — a testament to just how influential National has been in shaping the sealing and bearing aftermarket.

What National Oil Seal Makes

At its core, National specializes in wheel-end solutions and sealing technology. The brand's product catalog spans a wide range of components designed to keep lubricants in and contaminants out, with coverage for thousands of domestic and import vehicle applications.

The brand's wheel bearing and hub assemblies are among its best-selling offerings, delivering pre-greased, pre-set, and pre-torqued units that simplify installation while meeting or exceeding original equipment specifications. Complementing these are National's wheel hubs, engineered to precise dimensional tolerances for accurate fitment and long-lasting performance.

Of course, oil seals remain the heart of the National product line. These seals — also known as shaft seals, grease seals, or dirt seals — close the gap between stationary and rotating components to retain lubricants and block out debris, moisture, and other contaminants. National's oil seals are available in a wide range of designs, including single and double lip, rubber and polymer compounds, and metal-cased varieties, making them suitable for an enormous breadth of applications.

National also offers a comprehensive lineup of wheel bearings — individual bearing components for applications where a full hub assembly isn't required. These bearings are manufactured to close tolerances and are designed to handle the radial and axial loads generated during everyday driving and heavy-duty use alike.

One of National's standout innovations is the proprietary RediCoat sealant technology, which fills minor bore imperfections to ensure a leak-free installation even when housing surfaces aren't perfect — a real-world advantage for technicians working on older or worn components.

Why Technicians Trust National Oil Seal

Professional mechanics and serious DIYers have relied on National for decades because the brand consistently delivers OE-quality fit and function at an aftermarket price point. With broad vehicle coverage, application-specific engineering, and a part number system that serves as an industry benchmark, National Oil Seal remains an essential name for any wheel-end or sealing repair job.