1. Product Overview 399A/394A is single row imperial standard tapered roller bearing, consisting of separable inner cone (399A) and outer cup (394A). It can withstand combined heavy radial load and unidirectional axial thrust. Usually installed in opposite paired layout to bear bidirectional axial forces. Separable structure facilitates independent mounting, inspection and component replacement. Open design supports regular re-lubrication maintenance. Widely used on