If a hole is properly drilled to size, what should happen with the NoGo pin of the Go/NoGo gauge?

When a hole is properly drilled to size, the NoGo pin of a Go/NoGo gauge is designed to ensure that the hole is not oversized. The purpose of the NoGo pin is to check that the hole's diameter does not exceed the maximum allowable limit. Therefore, if the NoGo pin does not fit at all from either side, it indicates that the hole is within the correct tolerance range and not too large.

In practice, if the NoGo pin fits into the hole, it means the hole exceeds the specified size (oversized), which would not be acceptable for the part's application. The requirement for the NoGo pin is to fail the fit if the hole is at or below the maximum diameter specification. Thus, the correct condition is for the NoGo pin to not fit at all, confirming that the hole is drilled correctly to size and within specifications.