National 5123 Wheel Seal - Front Inner

National 5123 Wheel Seal for Front Inner Applications

National 5123 is a wheel seal built for front inner service on select Cadillac Eldorado and Oldsmobile Toronado models. It uses nitrile construction and a Redicoat finish to support sealing performance in driveline and axle applications where accurate dimensions matter.

Key Features

• Wheel seal / oil seal for driveline and axle sealing systems
• Nitrile material for sealing durability
• Redicoat finish
• Series 5000 design
• Inside diameter: 2.562 in. / 65.070 mm
• Outside diameter: 3.095 in. / 78.610 mm
• Housing bore: 3.090 in. / 78.490 mm
• Width: 0.375 in. / 9.530 mm
• Type 280 seal profile

Detailed Description

National 5123 is a front inner wheel seal engineered to match the listed shaft and housing dimensions for proper sealing at the wheel end. The seal measures 2.562 inches inside diameter, 3.095 inches outside diameter, and 0.375 inches wide, with metric equivalents of 65.070 mm, 78.610 mm, and 9.530 mm. National has supplied sealing products for more than 75 years, and this part reflects that focus on dimensional accuracy and modern vehicle sealing requirements. This part cross-references Centric Parts 417.62017 for the same application.

Vehicle Fitment

• Fits 1969-1978 Cadillac Eldorado, Front Inner
• Fits 1969-1978 Oldsmobile Toronado, Front Inner

Common Issues Addressed

• Wheel-end oil leakage at the seal surface
• Contamination entering the hub or axle area
• Wear-related sealing loss from an aged front inner seal
• Incorrect seal dimensions during wheel seal replacement
• Service needs on Cadillac Eldorado and Oldsmobile Toronado front inner applications

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the sealing surfaces thoroughly and inspect the hub, spindle, and mating surfaces for wear or scoring. Proper alignment during installation helps prevent damage to the nitrile sealing lip and supports a correct seal seat.

Quality Assurance

National is a long-established sealing brand with a history of supplying premium sealing solutions for automotive service. Part number 5123 is built to the listed dimensions and material specification for the stated front inner fitments.