INTERN MPAPS G-20 PDF

This specification covers Navistar’s requirements for electrodeposited zinc coatings on iron and steel substrates. Provision is also made to specify mechanical plated zinc coatings by the addition of a suffix “M” to the class designation.

APPLICATION

Zinc plating is used primarily for corrosion resistance. This specification provides for several classes of zinc plating for use on both Engineering designed parts and Engineering Standard Parts. Typical parts include clips, clamps, brackets, small stampings, tubes, rivets, rivnuts, lock bolt collars, screws, bolts and nuts, washers, and fittings. Caution should be exercised when specifying zinc plating for use on components that may be in contact with stressed nylon components. To avoid embrittlement of the nylon, use of a different coating such as MPAPS G-4518, is advised. When zinc plating is unavoidable, consider the use of GF reinforced nylon, or higher strength varieties such as Nylon 612.