Which of the following describes transition fits?

Transition fits are a type of fit that allows for a slight amount of play or variation during assembly. This means that when two parts with a transition fit are assembled, they can either be tight or loose, depending on the specific tolerances of the parts being joined. This flexibility makes transition fits particularly useful in applications where a precise fit is not critical, but some degree of movement or adjustment is necessary to accommodate manufacturing variations.

In contrast, looser fits or those requiring a tight fit do not accurately represent the nature of transition fits. Additionally, while screw threads may have a specified fit, they do not directly relate to the concept of transition fits, which encompass a broader range of tolerances across different types of assemblies. Thus, the definition that highlights the allowance for slight variations during assembly aligns perfectly with the characteristics of transition fits.