FORD WSS-M21P40-A1

Description / Abstract: FORD WSS-M21P40-A1, 2019 Edition, March 22, 2019 - FASTENER FINISH S440, ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMATE, LUBRICATED ALUMINUM-RICH ORGANIC TOPCOAT, SILVER ***TO BE USED WITH FORD WSS-M99P1111-A***

The materials defined by these specifications are corrosion protective coatings over steel. They consist of an electrolytic or mechanical zinc plate, a hexavalent chromium free conversion coating, and an integrally lubricated aluminum-rich topcoat. This coating system provides enhanced corrosion protection, and consistent torque-tension control.