This roller guides along a track by means of a double row angular contact ball bearing built into a solid stud with external thread, giving axial guidance of the outer ring through the ball arrangement itself rather than an eccentric collar. The outer ring is particularly thick-walled, outside diameter is 52.0 mm, overall width 63.6 mm, mass 0.39 kg, and a hexagonal socket on the flange-side face allows mounting without gripping the outer ring. Sealing is provided by lip seals on both sides (2RS) with axial sealing action, keeping contamination out of the raceway, though there is no relubrication facility, so the grease fill must last for the service life. The solid stud and thread allow direct fixing without a separate axle, and the ball-guided axial arrangement suits applications where the roller must run against a track face while carrying axial loads from that guidance.