What tool is used for inspecting the manufactured head and collar of the Hi-Lok?

The appropriate tool for inspecting the manufactured head and collar of the Hi-Lok is a gap inspection shim. This tool is specifically designed to measure the precise gap between components, making it essential for quality control in aerospace assembly where tolerances are critical. Gap inspection shims allow mechanics to ensure that the Hi-Lok's head and collar meet the specified dimensions necessary for proper function and safety.

Using a gap inspection shim can help identify any discrepancies in the manufacturing process that could lead to failures or safety hazards during operation. This level of meticulousness is vital in aerospace applications to maintain the integrity and reliability of assembled components.

While the other tools listed have their own applications — such as torque wrenches being used for tightening principles, calipers used for general measurements, and measuring tapes for larger dimensions — they are not specifically designed for the precision intake and evaluation of gaps like the gap inspection shim is. Thus, for the specific task of inspecting the Hi-Lok components detailed in the question, the gap inspection shim is the correct and most effective tool to use.