A conveyor belt roll assembly comprising a roll casing, a roll end mounted at opposite axial ends of the roll casing and a rolling bearing with a first bearing ring supported in the roll end and a second bearing ring secured in an axial direction by means of a ring member connected to the shaft. The roll end has a radially outwardly directed flange with corrugations at its outer edge extending in a peripheral direction and the ring member axially securing the bearing on the shaft is arranged outside of the bearing. The conveyor belt roll assembly further includes a radially outwardly directed disc fastened to the shaft and forming a radial sealing slot with the axial outer face of the roll end.