Inspection requirements for dimensions and other requirements of fasteners after plating

Except for the thread size of the threaded fasteners after plating, when there are no special requirements, the size requirements of other products are applicable to the inspection before plating, and the inspection is not performed after plating. In order to ensure the screwability of the thread after plating, the inspection of the thread after plating should be in accordance with GB / T3934, and the tolerance zone is h or H thread gauge to check the external or internal thread. In other words, the size of the external thread after plating should not exceed the zero line, and the internal thread should not be lower than the zero line. The requirements for appearance, corrosion resistance, adhesion, and toughness of the electroplated layer after plating should comply with the relevant national standards.