These are custom tin cobalt plated 10-32 X 1 machine screws made using type 316 stainless steel, designated by a dot on the head of each screw. Like the other custom tin cobalt chrome plated screws, these phil truss machine screws are manufactured overseas and supplied to our long time customer on a revolving blanket purchase order basis. The tin cobalt chrome plating is done in a barrel plate format for improved cost efficiency while still producing a very attractive cosmetic finish. Tin cobalt finish typically provides a slightly duller chrome finish than the traditional hexavalent chromium plating. All the custom tin cobalt plated parts we supply are electroplated with a bright nickel under-plate for improved longevity and appearance.
