The invention relates to a cast and adjacent casts on a shaft for providing a shaft assembly for a disc screen. A cast which is placeable on a shaft for a disc screen comprises a screening element part with an integral sleeve part. The shaft assembly for a disc screen comprises casts placed on the shaft, each cast comprising a screening element part and an integral sleeve part, the casts being placed against each other so that abutting screening element parts of two adjacent casts constitute a screening element, and abutting sleeve parts of two adjacent casts constitute a sleeve element on the shaft.