Thread ring threaded plug threaded plug and ring gauges 
 Thread plug gauge with ball bearing steel or high strength aluminum alloy, high hardness, wear resistance, dimensional stability and reliability, combined with color anodized surface treatment, handsome in appearance, lightweight and convenient. 
 Thread plug gages wear special steel, hardened and polished NO and NOGO plug clearly marked on both ends meet German DIN7162 tolerance H6 quality production standards. 
 Thread plug thread size is to measure the accuracy of the tool, can be divided into an ordinary coarse teeth, fine pitch, and three threaded tubes. 
 Thread plug thread for the integrated and comprehensive inspection and testing male. 
 Common thread plug gauge each nominal size is usually two to a group. One is the only regulation, one is through regulation, respectively, limits the size of upper and lower limits thread. If the thread can be measured with the threaded pass through the rotary joint regulation, and regulation ended with the thread, not entirely through the rotary joint (screw only regulation allowed only two rotating threaded together with the measured, the amount of no more than two co-rotating pitch) to show that The role of the tested screw diameter does not exceed its maximum diameter solid tooth type, and the diameter of a single entity does not exceed the minimum diameter tooth type, you can guarantee the rotary joint and joint strength, the measured pitch diameter qualified. Thread diameter is qualified to test precision is an important indicator. Three-pin measurement is an indirect measurement of the diameter of simple methods. Measure the same diameter when the amount of three threaded needle on the grooves in the test, in which two adjacent grooves on the same side, the other on the opposite side corresponding to the middle of the groove. With a lever micrometer, measure the amount of needle outline the maximum distance M value, and then through a certain formula, find the thread diameter measured M. Screw thread a few laps, and the large thread pitch (pitch is greater than 6.5), do not have the amount of measurement with three-pin, and with the needle is convenient and feasible method of measurement. Thread plug gauge to be measured through the scale of the largest entities thread tooth type, the role of test diameter measured thread is over its maximum diameter solid tooth type, thread plug also examined whether the bottom diameter of the actual size exceed the maximum physical size. 
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