Improvements in or relating to screw threaded fastenings

摘要: 811,573. Electroplating. IONIC PLATING CO. Ltd. May 18, 1956 [May 1955], No. 14296/55. Class 41. [Also in Group XXV] A screw-threaded member has the threaded portion formed of steel, is to a diameter and pitch according particular standard employed, threads electroplated with protective coating comprising one or more layers tin-cadmium alloy alternate tin cadmium. In arrangement an layer by im-. mersing successively cadmium electroplating baths then subjecting it heat treatment final film may be provided immersing coated chromate-solution bath. The sufficiently thin require no alteration cooperating screwed which made same and, specific embodiment, for 0.0001 inch each said provide equivalent anti-corrosive properties 0.0005 either alone.