Cage for a radial ball bearing

A cage for separating the balls of a radial ball bearing, comprising an annular body of resilient plastics material having pockets for reception of the balls, the annular body being formed on one side thereof with a plurality of flanges arranged in pairs spaced around the body and with guide prongs arranged one between adjacent pairs of the flanges, each pair of flanges defining the mouth of a separate one of said pockets in the annular body, and the guide prongs being arranged to guide the balls into the mouths of the pockets upon fitting of the annular body into the bearing from a side thereof, the mouths of the pockets having a width less than the diameter of the balls, and the annular body being deformable by the force between the balls and the flanges upon fitting the annular body into the bearing so as to enlarge said mouths for introduction of the balls into the pockets as a snap fit, wherein the cage includes a retainer ring adapted to be mounted on said guide prongs to maintain substantially the same chord distance between the guide prongs and thereby restrict deformation of the annular body and prevent disengagement of the annular body from the balls due to the contact forces between the balls and the annular body during operation of the bearing.