Thread plug gaugeIt is a tool for measuring the accuracy of internal thread dimensions. thisPlug gaugeThe types can be divided into three categories: ordinary coarse teeth, fine teeth, and pipe threads. For pitch of 0.35 millimeters or less, with 2nd level accuracy and higher than 2nd level accuracyThread plug gaugeThreads with a pitch of 0.8 millimeters or less and a precision of 3 levelsPlug gaugeThere are no end measuring heads. Thread plug gauges below 100mm are taper shank thread plug gauges. Double shank threads with a diameter of over 100mmPlug gauge.