What is threaded plug gauge? Why it used in machine knife inspection?

Threaded plug gauges are tools for measuring the correctness of internal thread sizes. This type of plug gauge can be divided into three types: ordinary coarse teeth, fine teeth and pipe threads. Threaded plug gauges with a pitch of 0.35 mm or less, Class 2 accuracy and higher than Class 2 accuracy, and Grade 3 precision threaded plug gauges with a pitch of 0.8 mm or less have no end probes. Threaded plug gauges up to 100 mm are taper shank thread plug gauges. More than 100 mm is a double-handle thread plug gauge.

Detection function: The thread plug gauge simulates the largest solid tooth shape of the thread to be tested. The thread plug gauge verifies whether the medium diameter of the thread under test exceeds the median diameter of its largest solid tooth shape, and the thread plug gauge and simultaneously checks whether the actual diameter of the bottom diameter exceeds Its largest physical size.

Threaded plug gauge can be used in paper cutting knife inspection as photo below. To make sure that it's easy for customer to install the paper cutting knife on the paper guillotines.