Grade 2 Coupling Nut, Galvanized
These coupling nuts will either conform to SAE J995 Grade 2 or ASTM A563 Grade A, both of which are manufactured from carbon steel and are equivalent in strength.Dimensional specifications are governed by ASME B18.2.2. Grade markings are not required for either A563 Grade A, or SAE J995 Grade 2 hex coupling nuts. Coupling nuts, also known as extension nuts, are used for joining two male threads, usually threaded rods, in a variety of applications. Available in hot dip galvanized finish, which provides a corrosion resistant zinc coating.