National 350609 Automatic Transmission Torque Converter Seal

Automatic Transmission Torque Converter Seal

National 350609 is an automatic transmission torque converter seal built for metric applications that require a precise sealing surface. It uses polyacrylate material and a counter-clockwise spiral lip design to help maintain a consistent seal at the converter interface in Honda and Acura transmissions.

• Polyacrylate construction for transmission sealing applications
• Counter-clockwise spiral lip design
• Metric dimensions for accurate housing and shaft fit
• Inside diameter: 1.732 in. / 44.000 mm
• Outside diameter: 2.689 in. / 68.300 mm
• Width: 0.315 in. / 8.000 mm
• Housing bore: 2.677 in. / 68.000 mm
• National 350609 / Series 350000

Fitment Coverage

Compatible with a wide range of Honda and Acura automatic transmission applications, including Fits 2013-2015 Acura ILX, N/A; Fits 2004-2014 Acura TSX, N/A; Fits 1981-2014 Honda Civic, N/A; Fits 1997-2014 Honda CR-V, N/A; Fits 2013-2014 Honda Fit, N/A; Fits 1984-2012 Honda Accord, N/A; and Fits 1995-2008 Acura TL, N/A. This part cross-references Bosch 18124 and BBB Industries 17166 for the same application.

Product Details

National 350609 is part of National’s 350000 series and is engineered as an oil seal for automatic transmission torque converter service. The metric sizing, 44 mm shaft diameter, and 68.3 mm outside diameter support accurate installation in the specified Honda and Acura transmissions. National has focused on sealing solutions for decades, and this seal reflects that experience with a design suited to modern drivetrain requirements.

Common Repair Uses

• Transmission fluid leakage at the torque converter seal area
• Seal wear from age, heat, or fluid contamination
• Drivetrain service on Honda Civic, Accord, CR-V, and Fit automatic transmissions
• Replacement during transmission rebuild or converter service
• Restoring proper sealing in Acura ILX, TSX, TL, and related applications

Installation Notes and Tips

Verify shaft, housing bore, and width dimensions before installation. Inspect the sealing surface for scoring or wear, and confirm the transmission code or configuration when the vehicle listing includes a transmission-specific note. Clean the bore thoroughly and install the seal squarely to avoid lip damage during assembly.

Quality Assurance

National is recognized for premium sealing solutions and long-term engineering support across automotive applications. Part number 350609 is built to meet the dimensional and material requirements of the listed Honda and Acura fitments.