SKF 21918 Axle Spindle Seal - Front, Front Inner or Front Outer

SKF 21918 Axle Spindle Seal

SKF 21918 is an axle spindle seal built for front axle applications that need reliable lubricant retention and contamination control. With a nitrile sealing surface and application-specific dimensions, it is suited for Ford front axle service where seal fit and material compatibility matter.

• Part number 21918 for direct reference in axle seal replacement searches
• Nitrile sealing surface type for dependable sealing performance
• Width: 0.729 in.
• Outside diameter: 3.136 in.
• Shaft diameter: 2.186 in.
• Fits front inner and front outer axle positions, depending on application

Application Coverage

Compatible with 2000-2005 Ford Excursion, front inner and front; 1999-2004 Ford F-250 Super Duty, front inner; 1999-2004 Ford F-350 Super Duty, front inner; 1983-1998 Ford F-250, front outer with Spicer 44 & 50 axles; and 1997 Ford F-250 HD, front outer with Spicer 44 & 50 axles. This SKF 21918 axle spindle seal is also a fitment match for Ford Excursion and Ford F-250/F-350 front axle service searches where the seal dimensions and position match the vehicle.

SKF has a long history in seal engineering, including early integrated shaft seal development and continued refinement of bonding methods and material selection. This part cross-references 44505 and 975921918 for the same application.

What It Helps Address

• Gear oil or lubricant seepage at the axle spindle area
• Contamination entering the axle assembly through a worn seal
• Seal wear from age, heat, and road exposure
• Incorrect seal fit during front axle service
• Noise or component wear related to lubricant loss

Installation Notes

Verify shaft diameter, outside diameter, and width before installation to confirm the seal matches the axle housing and spindle dimensions. Clean the sealing surface and inspect the spindle for grooves, corrosion, or damage that could affect sealing performance. Confirm front inner or front outer position and axle type before ordering for Ford Excursion, Ford F-250 Super Duty, or Ford F-350 Super Duty service.

Quality Assurance

SKF manufactures seals to specific designs using premium materials and controlled production standards for long service life and safety-focused performance.