The parts might have a slight clearance or a slight interference, used for accurate location where a light push is needed. Interference Fit (Press Fit):
is a German standard titled "Limits and Fits; Principles; Terms and Definitions relating to the Standard DIN 7160 – Deviations and Fits for Cylindrical Workpieces." din 7161 pdf
DIN 7161 provides a detailed specification for tolerances of linear and angular dimensions of metallic materials. The standard is widely used in Germany and Europe, and its tolerance classes and values can be compared to those of other international standards. By following DIN 7161, manufacturers and designers can ensure that their products meet required dimensional accuracy and tolerances. The parts might have a slight clearance or