663 Bearing Cone Fits NTNOne New Aftermarket Replacement 663 Bearing Cone for NTN Tapered Roller Bearing Applications This aftermarket replacement 663 bearing cone is a single row tapered roller bearing cone designed for use in J Series and inch series tapered roller bearing assemblies. The 663 cone handles both radial and axial (thrust) loads and is paired with a mating cup (sold separately) in heavy duty drivetrain, axle, differential, and wheel end applications across