What size relationship does an interference fit indicate between mating parts?

An interference fit indicates a relationship between mating parts where the parts fit tightly together. This means that when one part is installed onto another, the dimensions of the two components are such that they cannot slide into place easily; instead, they require force to assemble. The interference, which is a slight overlap in the sizes of the mating surfaces, ensures that the parts are held securely together once they are assembled. This tight fit is often used in applications where the connection must withstand significant forces without wobbling or separating, such as in mechanical assemblies where components need to function reliably under load.

In contrast, the other options describe relationships that do not apply to an interference fit; they either refer to parts that are too loose or incompatible for assembly.