Chrome plating adds only about 15-20 % to the cost of a typical screw and it provides so many benefits with almost no performance disadvantages. Yet many processors opt not to go with such screws.
Although most processors are familiar with chrome-plating, there is an important specification to be considered in purchasing a chrome-plated screw or having a repaired screw chrome-plated. The critical specification is the depth of the plating. It is not enough to plate a screw with less than .02 mm (referred to as “flash chroming”). Flash chromed screws tend to nick and then peal off into the resin causing reject parts and opening the screw to severe wear to the unprotected, typically, soft 4000 series alloy steel. Chrome-plating should be at least .007 mm to .12 mm dia metricaly thick and guaranteed by your supplier.
Such screws are mainly to be used for the corrosive and other free flow material, because chomre plating screw lots of cause of burning problem and degrading problem can be solved.