Plastic bearing cage

A weldable plastic bearing cage assembly which comprises a pair of annular side rails and a plurality of circumferentially spaced axially extending ribs affixed at one of their ends to one of said side rails, coacting means on the end portion of each said rib and on the opposed face of the adjacent side rail including an aperture and a cooperating projection disposed with the end portion thereof in interferring telescopic relationship within said aperture, said aperture formed with a first section of a cross sectional configuration generally conforming to the cross sectional configuration of the end portion of said projection and a second section inwardly spaced from said first section of a different cross sectional configuration and forming a shoulder at the intersection therebetween against which shoulder the end of said projection is disposed in abutting relationship, the end portion of each said rib formed with a rib end face disposed in spaced substantially parallel relationship relative to the opposed face surface of the adjacent said side rail, the length of said projection being greater than the depth of said first section and less than the combined depth of said first and said second section.