National 221207 Automatic Transmission Manual Shaft Seal

Automatic Transmission Manual Shaft Seal for OE-Style Repair

National 221207 is an automatic transmission manual shaft seal built for precise sealing performance in a wide range of import and domestic applications. With nitrile sealing material and metric dimensions, it supports leak control where the transmission shaft passes through the housing.

National has supplied sealing solutions for more than 75 years, and this oil seal reflects that focus on dimensional accuracy and modern vehicle coverage. It is a direct-fit option for many BMW, Toyota, Lexus, Nissan, Honda, Volvo, and other automatic transmission applications.

Key Features

• Part number: 221207
• Nitrile sealing material for transmission sealing applications
• Metric dimensions for OE-style fitment
• Inside diameter: 12.000 mm (0.472 in.)
• Outside diameter: 22.250 mm (0.876 in.)
• Width: 7.000 mm (0.276 in.)
• Housing bore: 22.000 mm (0.866 in.)
• Part description: oil seal
• Series: 220000, Type 35

Detailed Description

National 221207 is engineered as an automatic transmission manual shaft seal for vehicles that require a compact metric oil seal with a 12 mm shaft diameter and 22.25 mm outside diameter. The nitrile sealing material is selected for transmission sealing service, helping maintain a tight seal at the shaft interface and housing bore. This part cross-references ATP HO-22 for the same application.

Fitment coverage includes many vehicles such as the 2014-2019 BMW i8, 2016-2019 Toyota RAV4, 2014-2019 INFINITI Q50, and 2015-2019 Volvo XC60. It also appears in applications across Lexus RX350, Nissan Altima, Honda Civic, and Toyota Camry platforms, making National 221207 a practical choice when replacing a leaking transmission shaft seal.

What This Part Helps Address

• Transmission fluid seepage at the manual shaft area
• Oil leakage around the housing bore
• Seal wear from age, heat, and fluid exposure
• Loss of sealing integrity during transmission service
• Repeat leaks caused by incorrect seal dimensions

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the bore and shaft surface thoroughly, and inspect for scoring, corrosion, or burrs that can damage the new seal. Press the seal in evenly to avoid distortion, and confirm the transmission application matches the vehicle and transmission code listed in the fitment data, including notes such as Aisin TG-81SC or Jatco JF016E where specified.

For fitment examples, this part fits 2016-2019 Lexus RX350, 2017-2019 Nissan Altima, and 2015-2019 Volvo XC60 in the listed applications. National 221207 is also used across many Toyota, Honda, Acura, and Mitsubishi models with confirmed transmission-specific coverage.

Quality Assurance

National has built its reputation on premium sealing solutions and long-term industry experience. The 221207 seal is produced to support modern transmission service needs with consistent dimensions and material selection for OE-style replacement work.