Abstract: A functional unit for a rotary printing press and a rotary printing press having such a functional unit is disclosed. The functional unit has an assembly unit to receive at least one component of the functional unit, in which the assembly unit has at least one assembly section, at least one assembly opening that is formed in the assembly section and in which the at least one component is received, and a support section on which a weight load is supportable. A component-free opening that in one cross-sectional dimension is at least as large as one cross-sectional dimension of the assembly opening is provided in the assembly section between the support section and the at least one assembly opening. Pre-stresses induced by the weight load on a bearing element are thereby inexpensively reduced or avoided for the component.