Non-standard screw nuts are also the largest invention of human beings. Non-standard screws and nuts are indispensable industrial necessities in our daily life. The non-standard screw nut is actually a tool that uses the physical and mathematical principles of the slanted circular rotation and friction of the object to gradually fasten the mechanical parts. Non-standard screw nut surface inspection is divided into two kinds, one is the non-standard screw nut production after plating before the test, the other is the non-standard screw nut plating after the test, which means that the screw is hardened , Non-standard screw nut surface treatment after inspection.
Non-standard screw nut surface treatment, we have to plate the non-standard screw nut inspection, the main test of the plating color and whether the non-standard screw nut and other non-standard. In this way, when we send non-standard screws and nuts to the customer, the customer can successfully pass the goods when they receive goods.