National 240356 Steering Gear Sector Shaft Seal

Steering Gear Sector Shaft Seal

National 240356 is a steering gear sector shaft seal built for classic manual-steering applications. It uses nitrile sealing material and precise dimensional sizing to help maintain a tight seal at the steering gear housing.

Key Features

• Nitrile construction for sealing performance in steering gear service
• Oil seal design for sector shaft applications
• Measured to match the specified shaft and housing bore dimensions
• Part of National Series 240000
• Fits a wide range of vintage Chrysler, Dodge, Ford, Lincoln, Mercury, Checker, DeSoto, Fargo, and Plymouth applications

Detailed Description

This National steering gear sector shaft seal is engineered for vehicles that use a manual steering gear setup or the listed steering gear configurations. The seal dimensions include a 1.250-inch shaft size, 1.686-inch housing bore, and 0.187-inch width, with nitrile used for the sealing material. National 240356 is a direct-fit sealing component for restoring the steering gear interface on many older vehicles, including Ford F-100, Ford F-250, and Ford F-350 applications with the specified 3-tooth type and manual steering. It also covers numerous Chrysler, Dodge, Plymouth, Mercury, Lincoln, DeSoto, Checker, and Fargo models listed in the fitment data. This part cross-references Gates (e.g., 12334, 22494) for the same application.

Common Repair Uses

• Stops steering gear oil seepage at the sector shaft
• Addresses fluid loss from worn or hardened seal material
• Helps correct steering gear contamination from external leakage
• Replaces a damaged seal during steering gear service
• Supports restoration work on older manual-steering systems

Installation Notes

Verify the shaft diameter, housing bore, and seal width before installation. Fitment varies by make, model, year, and steering configuration, and some applications require manual steering or specific tooth-type steering gear details. Review the vehicle notes carefully before ordering. National 240356 should be installed as a precision sealing component during steering gear service.

Quality Assurance

National has supplied sealing solutions for more than 75 years and is recognized for its focus on advanced sealing design for modern and legacy vehicles. Part number 240356 is backed by that sealing expertise and the dimensional consistency expected for steering gear service.