Thread pitch gauge
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A thread gauge, also known as a screw gauge or pitch gauge, is used to measure the pitch or lead of a screw thread.
Three different sets of threading gauges. The uppermost gauge is an ISO metric pitch gauge, the larger gauge in the center is for measuring the Acme thread form, and the lower gauge is for Whitworth screws.
Usage of a thread pitch gauge
ISO metric screw thread
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The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. They were one of the first international standards agreed when the International Organization for
Profile of an M20 thread.