Medium duty units have been designed to withstand impact damage through misalignment of the conveyed item and also incorporate a resistance to shock loads applied to the main ball. Medium duty units have the internal hemispherical form machined directly into the solid steel base. The load-bearing base is then carefully case hardened for wear resistance and provides for smooth movement in any direction. All units with a main ball larger than 19mm are fitted with a felt seal to reduce dirt ingress.
