FAG SS5261 Differential Pinion Seal - Rear

FAG SS5261 Differential Pinion Seal

FAG SS5261 is a differential pinion seal built with nitrile sealing material and a rubber spring auxiliary-lip design to help keep drivetrain lubricant where it belongs. With precise dimensions and application-specific fitment, it is a direct replacement choice for many BMW, Hyundai, Kia, Mitsubishi, Dodge, Mazda, and Ford vehicles.

Key Features

• Part number: SS5261
• Seal type: rubber, spring, auxiliary lip
• Sealing material: nitrile
• Bore diameter: 2.559 in / 64.999 mm
• Seal outside diameter: 2.57 in / 65.278 mm
• Seal width: 1.772 in / 45.009 mm
• Designed for differential pinion sealing applications
• Cross-reference: National 1992

Detailed Description

This FAG differential pinion seal is engineered to meet vehicle manufacturer specifications for dimensional accuracy and sealing performance. The nitrile construction and auxiliary lip design help protect the pinion area from dirt, dust, and moisture while supporting lubricant retention in the differential. FAG SS5261 is a practical OE-style replacement for vehicles that require a 64.999 mm bore diameter and 65.278 mm outside diameter.

Compatible With BMW 320i rear applications across 1977-1983, 1993-1995, and 2001-2005; BMW 318i rear applications for 1984-1985, 1991-1998, and 1999; BMW 318is rear applications for 1991-1998 and 1999; BMW 318ti rear applications for 1995-1999; BMW 323i rear applications for 1998-2000; BMW 323Ci rear applications for 2000; BMW 323is rear applications for 1998-1999; BMW 328i rear applications for 1996-1998; BMW 328is rear applications for 1996-1998; BMW Z3 rear applications for 1996-2002; Hyundai Santa Fe front applications for 2003-2006; Kia Sorento front applications for 2003-2006; Mitsubishi Montero Sport applications for 1997-2003; Mitsubishi Montero applications for 1983-2002; Mitsubishi Mighty Max applications for 1983-1994; Dodge Ram 50 applications for 1983-1985 and 1987-1993; Dodge Power Ram 50 applications for 1983-1986; Mazda B2000 front inner applications for 1979-1984; Mazda B2200 front inner applications for 1982-1984; Dodge D50 applications for 1982; and Ford Courier front inner applications for 1972-1982.

Common Uses

• Replacing a leaking differential pinion seal
• Addressing gear oil seepage at the pinion area
• Restoring sealing performance after contamination exposure
• Helping reduce dirt, dust, and moisture intrusion
• Supporting lubricant retention in the differential housing

Installation Notes and Tips

Verify the bore diameter, outside diameter, and width against the original seal before installation. Clean the sealing surface and inspect the pinion area for wear, scoring, or contamination that could affect sealing. Confirm vehicle position and application details carefully, especially on BMW rear applications and front inner axle locations listed for Mazda and Ford models. FAG SS5261 should be matched to the exact differential application for proper fit.

Quality Assurance

FAG designs seals using high-quality materials and works with suppliers to meet its quality standards. The brand’s sealing products are built around vehicle-specific specifications, with attention to contamination protection and grease retention over the service life of the bearing and related components.