What does a Go pin indicate in a Go/NoGo gauge?

A Go pin in a Go/NoGo gauge serves as a critical tool in precision measurement, particularly in aerospace assembly and manufacturing processes. When the Go pin fits perfectly into the hole being measured, this indicates that the hole is within the specified tolerance limits, meaning it meets the required dimensions and quality standards.

Understanding the functionality of a Go/NoGo gauge is essential; the Go pin is designed to confirm that the part is acceptable for use. If the Go pin passes through the hole without obstruction, it signals that the hole dimensions are appropriate for the intended assembly, thereby ensuring proper fit and function of mating components.

In contrast, if the Go pin does not fit, it suggests that the hole could be too small, or other issues may affect its usability. This reliability makes Go/NoGo gauges vital in aerospace manufacturing, where precision and adherence to specifications are paramount for safety and performance.