Which gauge is used to inspect drilled holes?

The Go/NoGo pin gauge is specifically designed for inspecting drilled holes to ensure they meet the required specifications. This type of gauge consists of pins that are made to certain tolerances; the "Go" pin should fit into the drilled hole if the hole meets the minimum size requirement, while the "NoGo" pin should not fit if the hole exceeds the maximum allowable size. This efficient and straightforward method allows mechanics to quickly determine if a hole is within the specified tolerances, which is critical for maintaining quality control in aerospace assembly.

Other types of gauges, such as caliper gauges, micrometer gauges, and depth gauges, serve different purposes. Caliper gauges measure external and internal dimensions, micrometer gauges provide precise measurements of small distances, and depth gauges measure depth but do not specifically assess the tolerances of hole sizes. Therefore, while all these tools are important in various aspects of measurement and inspection, the Go/NoGo pin gauge is uniquely suited for the task of inspecting drilled holes.