The same product when they check different performance or parts, the detection method is not the same, the detection content is not the same. For example, for screws, calipers, projectors or micrometers are generally used when checking head size, and torsion testers are used when testing torque. When the long cross screw is thread thread, it is necessary to thread through the stop gauge, why is this?

When the long cross screws are machine thread threads, they need to be fastened with nuts or fittings with internal threads during assembly. If the external threads do not match the internal threads, assembly cannot be carried out. The check is to check whether the thread produced by the specification, on the other hand is to see whether the screw manufacturer jerry-built.

And the long cross screw through the check, need to pass 2 times. The first time is after the tooth rubbing is finished, to see whether it can pass. If it can not pass the stop rule, either there is a problem with the adjustment machine, or the light rod is too large or too small. There is also a stop rule is after the completion of electroplating, especially after the stainless steel material cleaning, sometimes the cleaning potion will cause damage to the thread, leading to the thread can not be used, let the thread through the stop rule is mainly to prevent the occurrence of this situation.