FAG SS3421 Wheel Seal - Rear

FAG SS3421 Wheel Seal

The FAG SS3421 wheel seal is built for wheel end service where contamination control and grease retention matter. It uses a metal, spring, and inner shell design with nitrile sealing material to help protect bearing components from dirt, dust, and moisture.

For buyers searching for a wheel seal for FAG SS3421, this part is specified with a 139.725 mm bore diameter, 139.852 mm outside diameter, and 15.24 mm width. It is a direct-fit style wheel seal for applications that require precise sealing dimensions.

Key Features

• Part number: SS3421
• Wheel seal for driveline and axle sealing service
• Seal type: metal, spring, inner shell
• Sealing material: nitrile
• Bore diameter: 139.725 mm (5.501 in)
• Outside diameter: 139.852 mm (5.506 in)
• Width: 15.24 mm (4.166 in)
• Designed to help retain grease and block contamination at the wheel end

Detailed Description

FAG SS3421 is a wheel seal engineered to meet vehicle manufacturer specifications for wheel-end sealing. The seal construction combines metal support with a spring-loaded sealing element and inner shell, while the nitrile sealing surface is selected for dependable sealing performance in demanding axle and bearing environments. This part is appropriate for service work where exact dimensions and seal construction are critical to maintaining wheel bearing protection.

This part cross-references National 9128S and SKF 41550 for the same application. Buyers comparing wheel seal options for FAG SS3421 can use the listed dimensions and seal type to verify application before installation. It is commonly searched as a wheel seal for axle and bearing service on vehicles such as Honda Civic and similar passenger car wheel-end applications when the dimensions match the original seal.

What It Helps Address

• Grease loss at the wheel end
• Dirt and dust intrusion into bearing areas
• Moisture contamination around axle seals
• Wear caused by degraded or damaged wheel seals
• Noise or roughness related to compromised bearing lubrication

Installation Notes and Tips

Verify bore diameter, outside diameter, and width against the original seal before installation. Inspect the hub, spindle, and bearing surfaces for wear, scoring, or contamination, and replace damaged components as needed. Clean the sealing surface thoroughly and install the seal squarely to avoid distortion. For fitment-based searches, confirm the exact vehicle application by year, make, model, and position before ordering.

Quality Assurance

FAG states that its wheel seals are produced from high-quality materials and built to meet manufacturer specifications. The brand works with suppliers to align seal design with FAG quality standards, with the goal of protecting wheel-end components over the life of the bearing.