Why Is The 2mm Socket Head Cap Screws Grey After Phosphating, Not Black?
The 2mm socket head cap screws that is currently produced is generally surface treated. Some are for a beautiful look, and some are for a certain feature. But the surface-treated screws are sometimes a little different from what we want, like phosphating. Some phosphating treatments are gray, not black. Why is this? The 2mm socket head cap screws are made of carbon steel and needs to be phosphated. The hardening and heat treatment are carried out after the screw head and the tooth decay, and the surface color of the heat-treated 2mm socket head cap screws is black. Without heat treatment, the screws that are directly phosphatized and phosphatized, the surface color is gray. The difference between these two colors is worse than the heat treatment process. Therefore, in order to prevent the appearance that the customer wants is not the same, we will confirm with the customer what the required surface color is. Thereby to determine whether he...