National 1974 Wheel Seal - Front Inner or Rear Outer

National 1974 Wheel Seal Overview

National 1974 is a metric wheel seal built with nitrile material and sized for precise sealing at the shaft and housing bore. It measures 1.969 in. inside diameter, 2.648 in. outside diameter, and 0.433 in. width, making it a direct-fit sealing component for the rear outer position on select Nissan 720 applications.

National has supplied sealing solutions for more than 75 years, and this oil seal reflects that focus on dimensional accuracy and modern vehicle coverage. If you are servicing a Nissan 720 rear outer wheel seal application, National 1974 provides the correct metric dimensions and OE-style sealing format.

Key Features

• Wheel seal / oil seal for driveline and axle sealing service
• National part number 1974
• Metric dimensions for accurate fitment
• Nitrile sealing material for common wheel-end applications
• Inside diameter: 1.969 in. / 50.000 mm
• Outside diameter: 2.648 in. / 67.270 mm
• Housing bore: 2.638 in. / 67.000 mm
• Width: 0.433 in. / 11.000 mm
• Compatible With 1980-1986 Nissan 720, rear outer

Detailed Description

National 1974 is a metric wheel seal engineered around a 50 mm shaft and 67 mm housing bore, with a 11 mm width for controlled sealing at the wheel end. The nitrile construction is suited to sealing service where dimensional consistency and fluid retention matter. This part is listed for 1980-1986 Nissan 720 rear outer applications, including single rear wheel configurations, and it cross-references Four Seasons 66547 for the same application.

For buyers searching for a Nissan 720 rear outer wheel seal, National 1974 offers the exact size profile needed for service work on the rear axle sealing area. The part number 1974 is also useful when matching an OE-style replacement by dimensions and application.

What It Helps Address

• Gear oil seepage at the wheel-end seal area
• Contamination entering the hub or axle sealing surface
• Noise or wear related to a compromised rear outer seal
• Loss of sealing integrity from age, heat, or mileage
• Service replacement needs on 1980-1986 Nissan 720 rear outer applications

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation to confirm the National 1974 matches the axle end being serviced. Inspect the sealing surface for grooves, corrosion, or debris, and clean the bore thoroughly before pressing the seal into place. Proper alignment during installation helps prevent distortion of the nitrile lip and supports consistent sealing performance.

For Nissan 720 rear outer service, confirm the vehicle is within the listed 1980-1986 range and that the application is the single rear wheel configuration noted in the fitment data. Use the part number 1974 and the metric dimensions together when cross-checking replacement needs.

Quality Assurance

National has a long history in sealing technology and continues to develop sealing solutions for current vehicle service needs. National 1974 is built to the dimensional standards shown above and is backed by the brand’s established focus on premium sealing products.