PRE-GREASED HUB KIT 3.5K 655 1.720" SEAL

Function of the 1.720" seal

The 1.720" seal is the grease/oil seal installed at the rear (inner) side of the hub. Its main functions are to:

• Keep bearing grease inside the hub and bearings.

• Prevent dirt, water, and road contaminants from entering the bearing area.

• Maintain proper lubrication of the inner and outer wheel bearings.

• Help protect the spindle and bearings from premature wear and corrosion.

What “3.5K / 655” means

• 3.5K = approximately 3,500-lb axle capacity.

• 655 generally refers to a specific hub/bearing or manufacturer application designation; the exact meaning depends on the manufacturer.

• 1.720" seal = the seal's relevant diameter is 1.720 inches, which must match the corresponding spindle/hub dimensions.