What type of fit is required for the hole when using Hi-Lok fasteners?

The correct choice is a transition fit for the hole when using Hi-Lok fasteners. This type of fit allows for the necessary precision and alignment for the fasteners to function effectively under load. Hi-Lok fasteners, which are commonly used in aerospace applications, require a degree of clearance to ensure that they can be easily inserted while still allowing for sufficient load-bearing capacity and stability once installed.

In a transition fit, the hole is sized to allow for a small amount of clearance that can accommodate variations in manufacturing tolerances. This ensures that the fasteners can be securely tightened, providing the necessary clamping force without compromising the structural integrity of the assembly. This balance is crucial in aerospace engineering, where tolerances are tight and reliability is paramount.

Loose fits, interference fits, and press fits do not provide the optimal conditions for Hi-Lok fasteners. A loose fit would result in too much play, leading to instability and potential failure under load. An interference fit would require more force than is practical for assembly and could lead to damaging the fastener or surrounding materials. A press fit is also too tight, which could complicate the installation process and create undue stress on both the fastener and the hole. Thus, a transition fit is