FAG SS2221 Steering Knuckle Seal - Front

Steering Knuckle Seal for Front Wheel End Service

FAG SS2221 is a metal steering knuckle seal built for front wheel-end applications that need reliable contamination control and grease retention. It is engineered to match vehicle-specific requirements for classic Chevrolet, Ford, and GMC trucks and SUVs, including Chevrolet K10, Ford Bronco, and Ford F-250 front axle service.

Key Features

• Metal seal type with nitrile sealing material
• Bore diameter: 1.781 in. (45.237 mm)
• Seal outside diameter: 1.785 in. (45.339 mm)
• Seal width: 1 in. (11.913 mm)
• Built to help keep dirt, dust, and moisture out of the wheel end
• Helps retain grease over the service life of the bearing
• Fits front positions on select Chevrolet, Ford, and GMC applications

Detailed Description

FAG SS2221 is a steering knuckle seal designed for front wheel-end assemblies where precise sealing dimensions matter. The metal seal construction and nitrile sealing material are selected to support a tight seal at the bearing interface, helping protect the wheel end from contamination while maintaining grease inside the assembly. This part number is a direct service choice for a range of older 4x4 and truck platforms, including 1960-1975 Ford F-250, 1966-1972 Ford Bronco, 1969-1974 Chevrolet Blazer, and 1975-1977 Chevrolet K10 front applications. FAG SS2221 also cross-references National 204005 for the same application.

What It Helps Solve

• Grease loss at the front wheel end
• Dirt and dust intrusion into the bearing area
• Moisture contamination around the steering knuckle
• Seal wear from age-related front axle service
• Fitment issues when replacing a worn OE-style steering knuckle seal

Installation Notes and Tips

Verify bore diameter, outside diameter, and seal width before installation to confirm the correct match for the hub or steering knuckle. Clean the sealing surface thoroughly and inspect the bearing area for wear, scoring, or contamination before installing the new seal. For fitment-specific service, confirm the vehicle position and axle configuration against the application listing, especially on Ford F-100 AWD and 4WD front applications noted for 1966-1972 and 1970-1972 model years.

Quality Assurance

FAG designs wheel seals to meet vehicle manufacturer specifications and works with suppliers to maintain FAG quality standards. The SS2221 is built for demanding wheel-end sealing requirements where application-specific dimensions and material selection are critical.