National Oil Seal 711051 Axle Output Shaft Seal

The National 711051 is a precision-engineered axle output shaft seal (also known as a differential output shaft seal) designed to prevent lubricant leaks and keep contaminants out of the axle and drivetrain assembly. Built by National — a brand with more than 75 years of sealing expertise — this seal delivers dependable, leak-free performance that meets or exceeds original equipment standards.

Key Specifications:

• Type: Axle Output Shaft Seal
• Inside Diameter (Shaft): 2.008 in (51.0 mm)
• Outside Diameter: 4.394 in (111.6 mm)
• Housing Bore: 4.312 in (111.3 mm)
• Width / Thickness: 0.441 in (11.2 mm)
• Overall Width with Side Lip: 0.709 in (18.0 mm)
• Flanged Outside Diameter: 5.118 in (130.0 mm)
• Material: Ethylene-Acrylic (AEM)
• Series: 711000

Cross-Reference / OEM Part Numbers: 68084595AA, 0139974446

The ethylene-acrylic compound provides excellent resistance to heat, gear oils, and EP lubricants, making this seal well-suited for demanding drivetrain environments. National seals are recognized globally as a trusted name in gaskets and sealing systems for automotive and powersports applications.