An interference fit means the diameter of the fastener is always ___________ than the diameter of the hole in the mating part.

An interference fit signifies that the diameter of the fastener is intentionally designed to be larger than the diameter of the hole in the mating part. This allows for a snug, secure fit once the fastener is inserted into the hole, creating friction that helps to hold the components together under load. This type of fit is crucial in applications where load bearing and stability are essential, as it minimizes the possibility of movement or loosening of the fastener over time.

In contrast, if the fastener were smaller or equal to the hole, there would be insufficient grip or play, which could lead to instability or failure of the assembly. Understanding the significance of the interference fit is vital for maintaining the integrity of aerospace components, ensuring safety, and achieving the desired structural performance in various applications.