Anti-rotating cover seal

To prevent the cover from rotating together with the shaft, a cutout is provided on the outer circumference of the cover seal and a retaining plate (in the case of the steel plate covered bearing unit) or a spring pin (in the case of a cast iron covered bearing unit) is fitted into the cutout. Since other manufacturers' bearing units do not have such a jamming mechanism, their cover seals may rotate together with the rotating shaft.

Steel plate covered bearing unit		Cast iron covered bearing unit