663/653 Tapered Roller Bearing 3-1/4" x 5-3/4" x 1-5/8"663 653 Tapered Roller Bearing Set 3 1 4" Bore x 5 3 4" OD x 1 5 8" Wide Cone & Cup Pair This is a single row tapered roller bearing set including cone 663 and cup 653, engineered to handle heavy radial and axial loads in one direction. Made from rugged 52100 chrome steel, it's commonly used in trailers, truck wheels, industrial drives, and other high stress systems. Cone: 663 Cup: 653 Bore (ID): 3 1 4" inch Cup outer diameter (OD): 5 3 4" inch Cone