How are 200mm long screws inspected?

Screw accessories are applied to different items, such as cars we drive, buses we do, mobile phones we use and computers we use. It’s not usually obvious, but it’s important. So how to check the quality of the 200mm long screws?

Before inspecting the quality of the 200mm long screws, we need to know that it is divided into pre-electroplating inspection and post-electroplating inspection. The inspection before electroplating is mainly to check whether the appearance of the screw has exploded head, deviated head, size has reached the standard and other aspects, and whether the screw produced meets the customer’s requirements or national standards.

After the completion of the electroplating of 200mm long screws, it is mainly to check whether the surface color of electroplating is up to the standard, whether the thickness of the coating is up to the standard, and whether other screws are mixed in the process of electroplating. And the size of the screw also needs to be checked again. Sometimes, if the plating operation is improper, it will lead to thread can not be used. So the thread after electroplating is needed to check whether the gauge is still passing.