A-387A-P-AI Cone, Tapered Roller BearingOne New Aftermarket Replacement Cone, Tapered Roller Bearing 387A Series This 387A tapered roller bearing cone (inner ring assembly) is a heavy duty replacement designed for wheel hub assemblies on 9,000 lb and 10,000 lb capacity trailer axles, including Dexter axle models. The tapered roller design supports both radial and axial loads simultaneously and is typically mounted in opposing pairs on a shaft. The matching cup (outer race) for this cone is