Thread Standards and Inspection 151

Thread Standards and Inspection explains the various parts of threads and how to inspect them. Manufacturers inspect threads according to unified or ISO standards or using System 21, System 22, and System 23. Several features must be checked to make sure that threads meet specifications. Gaging inspection tools, or go/no-go gages, simply determine whether or not a part will fit. Variable thread inspection tools determine whether a thread falls within a specified tolerance range. Thread type and specifications affect the tools used to inspect threads. Understanding the various components and classifications used to identify threads is critical for accurate inspection. After the class, the user will be able to explain how to measure common threaded features with internal and external thread gages and verify the features are within tolerance.