A clearance fit means the diameter of the fastener is always ____________ than the diameter of the hole in the mating part.

A clearance fit is a specific type of fit used in mechanical assemblies where the dimensions of the components ensure that there is always space, or clearance, between them. In this context, when referring to the fastener and the hole in the mating part, the diameter of the fastener is designed to be smaller than the diameter of the hole.

This design allows for easy insertion and removal of the fastener and is essential in applications where components need to be assembled and disassembled frequently. The additional space helps accommodate any tolerances in manufacturing, as well as thermal expansion or other factors that could affect the fit during operation.

In contrast to this fit, interference fits would require the diameter of the fastener to be larger than that of the hole, ensuring a tight connection that does not allow for movement. Therefore, the concept of a clearance fit directly relates to the essential requirement that the fastener must be smaller in diameter than the hole it fits into.