ACME thread plug gauge is a tool for measuring the accuracy of internal thread dimensions. This plug gauge can be divided into three types: regular coarse thread, fine thread, and pipe thread. Thread plug gauges with a pitch of 0.35 millimeters or less and a second level accuracy or higher, as well as thread plug gauges with a pitch of 0.8 millimeters or less and a third level accuracy, do not have end gauges. Thread plug gauges below 100mm are taper shank thread plug gauges. A double threaded plug gauge with a diameter of over 100 millimeters.

The ACME thread plug gauge is used to measure the correctness of external thread dimensions, with one piece at the through end and one piece at the end. The stop ring gauge has grooves on the outer cylindrical surface. When the size is above 100 millimeters, the threaded ring gauge is of the double shank threaded ring gauge type. The thread ring gauge is used to measure the accuracy of external thread dimensions, with one piece at the through end and one piece at the end. The stop ring gauge has grooves on the outer cylindrical surface. When the size is above 100 millimeters, the threaded ring gauge is of the double shank threaded ring gauge type. The specifications are divided into three types: coarse teeth, fine teeth, and pipe threads. Thread ring gauges with a pitch of 0.35 millimeters or less and higher than level 2 precision, as well as thread ring gauges with a pitch of 0.8 millimeters or less and level 3 precision, do not have a stop end.