Stud type track rollers KR52..-2RS, double row self-retaining angular contact ball bearings with particularly thick-walled outer ring, ball and cage assembly, without eccentric collar and with a solid, long roller stud with external thread, axial guidance of outer ring is provided by the balls, lip seal on both sides, with axial sealing action, assembling aid hexagonal socket only on the flange side end face, no relubrication facility

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