FORD WSS-M21P52-A1

Description / Abstract: FORD WSS-M21P52-A1, 2019 Edition, March 22, 2019 - FASTENER FINISH S437U, ELECTROPLATED ZINC, TRIVALENT CHROMIUM PASSIVATE, SILVER IRIDESCENT ***TO BE USED WITH FORD WSS-M99P1111-A***

The materials defined by these specifications are corrosion protective coatings over steel and iron substrates. All consist of electrolytic or non-electrolytic zinc plating with trivalent chromium passivate. A2, A3 and A4 are also coated with a clear sealer to increase corrosion resistance and/or to provide consistent torque-tension control.