In a Go/NoGo gauge inspection, what does the No/Go pin indicate?

In a Go/No-Go gauge inspection, the No-Go pin serves a critical role in ensuring that a part meets specific dimensional tolerances essential for its function and safety. The No-Go pin is designed to be larger than the acceptable limit of the hole it is measuring. Therefore, if the No-Go pin does not fit at all, it confirms that the hole is within the acceptable range of dimensions.

This means that the part is acceptable for use, as it has not exceeded the maximum size limitation. If the No-Go pin were to fit into the hole, it would indicate that the hole is oversized or out of tolerance, which can lead to fit and function issues in the assembly of aerospace components. Thus, the correct indication of the No-Go pin is that it should not fit at all.