The metric thread plug gauge is a tool for measuring the accuracy of internal thread dimensions. This plug gauge can be divided into three types: ordinary coarse thread, fine thread, and pipe thread. Thread plug gauges with a pitch of 0.35 millimeters or less and a precision of level 2 or higher.

Metric thread ring gauge lead English name: lead Definition: The axial distance between two adjacent teeth on the same spiral line on the pitch diameter line corresponding to two points. Lead S: The axial distance that any point on the thread moves along the same spiral line for one revolution. The diameter of a threaded plug gauge, defined as the nominal diameter in the standard, refers to the larger diameter of the thread (diameter d), which is the diameter of the imaginary cylindrical surface that coincides with the thread crest.

Instructions for using metric thread plug and ring gauge: Thread gauge is a thread detection gauge, which can be used in two types: gauge and gauge. It is used to detect the large and small diameter values of threads. As long as the metric thread plug ring gauge passes the standard, the stop gauge is only qualified. The regulation is that the thread stop gauge cannot enter the thread more than 2. 5 turns, the general requirement is that the actual number of turns should not exceed 2 turns, and the force used should not be too strong. Our experience is to gently grip the thread gauge with the thumb and index finger until the force that can rotate the thread gauge is just enough. When using the thread ring gauge, we hold it with five fingers and evenly distribute it on the thread ring gauge, with the palm hanging in the air, and rotate the thread ring gauge with five finger force. The gauge can freely pass through the thread, and the stop gauge can be screwed in no more than 2. A tooth pattern of 5 circles (i.e. a groove on the outside of a typical gauge, with threads not exceeding this groove) can be considered qualified. The method of holding the thread plug gauge is very clear on the 14th floor. Measuring tools have precision requirements. If excessive force causes damage, they will lose their function. If the measuring tool loses precision, it will be scrapped and cannot be used again.

One method is to simulate the large solid tooth profile of the tested thread using a gauge, and to use a metric thread plug ring gauge to check whether the effective pitch diameter of the tested thread exceeds the pitch diameter of its large solid tooth profile, while also checking whether the actual size of the base diameter exceeds its large solid size. If the tested thread can be screwed through with the thread gauge and not screwed through with the thread stop gauge (the thread stop gauge only allows two sections of the tested thread to be screwed in, and the amount of screwing should not exceed two pitches), it indicates that the effective pitch diameter of the tested thread does not exceed the pitch diameter of its large solid tooth profile, and a single pitch diameter does not exceed the pitch diameter of its small solid tooth profile. Therefore, the compatibility and connection strength can be guaranteed, and the pitch diameter of the tested thread is qualified.

Another method is comprehensive testing and individual testing. Comprehensive inspection is the process of testing the comprehensive results of geometric parameter deviations that affect thread interchangeability using a gauge. This includes: using ordinary thread gauges and stop gauges to respectively inspect the working diameter (including base diameter) and single diameter of the tested thread; Use a smooth gauge to inspect the actual top diameter of the measured thread.