Why does the long screw pass through the gauge?

For the same product, when they check different performance or parts, they use different detection methods and detect different contents. For example, screws, calipers, projectors, or micrometers are used when checking the head size, and torque testers are used when testing the torque. When the long screw is machine thread, need thread through the gauge, this is why?

When the long screw is machine thread, it is required to tighten with nut or fittings with internal thread during assembly. If the external thread does not match with the internal thread, it cannot be assembled. And pass stop gauge is to check whether the thread that comes out conforms to a specification, also be to see screw manufacturer have cut corners on the other hand material.

And long screw through the gauge, the need for 2 times. One is after the teeth are rubbed to see if it can pass, if it can’t pass the gauge, either there is a problem with the adjustment, or the rod is too large or too small. There is a stop gauge is after the completion of electroplating, especially after the stainless steel cleaning, sometimes the cleaning potion will cause damage to the thread, leading to thread can not be used, let the thread through the stop gauge is mainly to prevent the occurrence of this situation.