7/8-9 A563 DH HEAVY HEX NUT, GALVANIZED DYED & WAXED

Grade DH Material Marking

Mechanical PropertiesGrade DH

1. 1. To determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread.
2. 2. Non-zinc-coated nuts are nuts intended for use with externally threaded fasteners which have a plain (nonplated or noncoated) finish or have a plating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assemblability. Zinc-coated nuts are nuts intended for use with externally threaded fasteners which are hot-dip zinc-coated, mechanically zinc-coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assemblability.
3. 3. Nuts made in accordance with the requirements of Specification A194/A194M, Grade 2H, and marked with its grade symbol are an acceptable equivalent for Grade DH nuts. When A194 zinc-coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification A563.

Chemical PropertiesGrade DH

1. 1. For Grade DH a sulfur content of 0.05 – 0.15 % is acceptable provided the manganese is 1.35 % min.

Dimensional SpecificationsGrade DH

1. All dimensions are in inches.