1. Product Overview 445/440A is standard imperial single row tapered roller bearing, composed of separable inner cone (445) and outer cup (440A). It supports combined heavy radial load and unidirectional axial thrust. Usually installed in opposed paired arrangement to withstand bidirectional axial forces. Separable cone & cup design simplifies assembly, disassembly, inspection and periodic re-lubrication. Widely applied on heavy-duty truck wheel hubs, agricultural tractors,