In today’s demanding manufacturing environment, it is vital that all of your threaded parts are properly inspected with the correct types of thread gages. Choosing the proper inspection instrument is a critical quality control decision; the wrong device or method could produce inaccurate results and also affect the cost and performance of the parts that are inspected.
For metric ISO threads—the most commonly used type of general-purpose screw thread worldwide—the gage system specified is ISO1502, which is used to ensure the unlimited compatibility of workpiece threads. In modern thread production, there are many various tools and inspection methods, from fixed limit gages to dial or digital types. Regardless of the tools or methods, it is important to make sure that the same results are achieved. In any case of doubt, the gages recommended in the standard ISO1502 will decide the result of the inspection for the metric ISO thread.