National 50151S Steering Gear Sector Shaft Seal - Rear Outer

Steering Gear Sector Shaft Seal for Classic GM Applications

National 50151S is a steering gear sector shaft seal built for manual steering systems that need a precise sealing fit. With nitrile sealing material and OE-style dimensions, it supports leak control in classic Chevrolet, Buick, Oldsmobile, and Pontiac steering gear assemblies.

Use this seal when servicing manual steering gear on vehicles such as the Chevrolet Bel Air, Corvette, and Impala, or the Pontiac Catalina and Bonneville. National 50151S is sized for a 1.125 in shaft, 1.565 in outside diameter, and 0.375 in width.

Key Features

• Steering gear sector shaft seal for manual steering applications
• Nitrile sealing material for oil resistance and sealing performance
• Inside diameter: 1.125 in (28.580 mm)
• Outside diameter: 1.565 in (39.750 mm)
• Width/thickness: 0.375 in (9.530 mm)
• Housing bore: 1.561 in (39.650 mm)
• National 50151S / Series 50000 / Type 5S

Detailed Description

National 50151S is an oil seal used in steering gear sector shaft service, with dimensions that match manual steering gear housings requiring a 1.125 inch shaft and 1.565 inch outside diameter. The nitrile material is selected for sealing against fluid exposure in steering assemblies, while the compact 0.375 inch width helps maintain proper fit in the housing bore. National has supplied sealing solutions for more than 75 years and continues to develop parts for older and current vehicle service needs. This part cross-references SKF 11067 for the same application.

What This Seal Helps Address

• Steering gear oil seepage at the sector shaft
• Fluid loss from worn or hardened steering seals
• Loose sealing caused by age-related seal shrinkage
• Service issues during manual steering gear rebuilds
• Leak repair on classic GM steering boxes

Installation Notes and Tips

• Confirm shaft diameter, housing bore, and seal width before installation.
• Inspect the sector shaft surface for scoring or wear that could affect sealing.
• Clean the housing thoroughly before pressing in the new seal.
• Verify manual steering configuration, especially on Chevrolet Bel Air, Corvette, Impala, and Pontiac Catalina applications.
• Fits 1950-1964 Chevrolet Bel Air, N/A; 1953-1962 Chevrolet Corvette, N/A; 1958-1964 Chevrolet Impala, N/A; 1950-1963 Pontiac Catalina, N/A; and other listed manual steering applications.

Quality Assurance

National is a long-established sealing brand with a focus on precision-fit oil seals and steering system sealing components. Part number 50151S is built to the listed dimensions for service work on compatible manual steering gear applications.