DH Heavy Hex Nut, Galvanized
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DH Heavy Hex Nut, Galvanized

ASTM A563 Grade DH heavy hex nuts are commonly used in structural bolting applications. ASTM A563 covers standard specifications for carbon and alloy steel nuts. They are a common high strength nut used mainly in structural applications with F3125 Grades A325 and A490 bolting. In many applications, A194 Grade 2H nuts can be substituted for A563 Grade DH nuts. Dimensional specifications are governed by ASME B18.2.2. Heavy hex nuts provide increased bearing surface area over finished nuts. Available in hot dipped galvanized finish, dyed & waxed for added lubrication and accurate torquing.

Governing StandardsGrade DH

ASTM A563 Covers the chemical and mechanical requirements for eight grades of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
ASME B18.2.2 Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Grade DH Head Marking
Grade DH Material Marking

Mechanical PropertiesGrade DH

Carbon & Alloy Steel Per ASTM A563-2015
Diameter Proof Load Stress (1) Core Hardness
ksi Rockwell
Non Zinc-
Coated (2)
Zinc-
Coated (2)
Min Max
1/4" thru 4" (3) 175 150 C24 C38
  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

Per ASTM A563-2015
Grade Material Carbon Manganese Phosphorus Sulfur
% by weight % by weight % by weight % by weight
DH (1) Carbon & Alloy Steel 0.20-0.55 0.60 0.04 0.05
  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

Heavy hex nut dimensions
Per ASME B18.2.2-2015
Nominal Diameter UNC F G H
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 0.250 20 1/2 0.500 0.488 0.577 0.556 15/64 0.250 0.218
5/16 0.313 18 9/16 0.562 0.546 0.650 0.220 19/64 0.314 0.280
3/8 0.375 16 11/16 0.688 0.669 0.794 0.763 23/64 0.377 0.341
7/16 0.438 14 3/4 0.750 0.728 0.866 0.830 27/64 0.441 0.403
1/2 0.500 13 7/8 0.875 0.850 1.010 0.990 31/64 0.504 0.464
9/16 0.563 12 15/16 0.938 0.909 1.083 1.037 35/64 0.568 0.526
5/8 0.625 11 1 1/16 1.062 1.031 1.227 1.175 39/64 0.631 0.587
3/4 0.750 10 1 1/4 0.250 1.212 1.443 1.382 47/64 0.758 0.710
7/8 0.875 9 1 7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833
1 1.000 8 1 5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956
1 1/8 1.125 7 1 13/16 1.812 1.756 2.093 2.002 1 7/64 1.139 1.079
1 1/4 1.250 7 2 2.000 1.380 2.309 2.209 1 7/32 1.251 1.187
1 3/8 1.375 6 2 3/16 2.188 2.119 2.526 2.416 1 11/32 1.378 1.310
1 1/2 1.500 6 2 3/8 2.375 2.300 2.742 2.622 1 15/32 1.505 1.433
1 5/8 1.625 5 1/2 2 9/16 2.562 2.481 2.959 2.828 1 19/32 1.632 1.556
1 3/4 1.750 5 2 3/4 2.750 2.662 3.175 3.035 1 23/32 1.759 1.679
1 7/8 1.875 5 2 15/16 2.938 2.844 3.392 3.242 1 27/32 1.886 1.802
2 2.000 4 1/2 3 1/8 3.125 3.025 3.608 3.449 1 31/32 2.013 1.925
2 1/4 2.250 4 1/2 3 1/2 3.500 3.388 4.041 3.862 2 13/64 2.251 2.155
2 1/2 2.500 4 3 7/8 3.875 3.750 4.474 4.275 2 29/64 2.505 2.401
2 3/4 2.750 4 4 1/4 4.250 4.112 4.907 4.688 2 45/64 2.759 2.647
3 3.000 4 4 5/8 4.625 4.475 5.340 5.102 2 61/64 3.013 2.893
3 1/4 3.250 4 5 5.000 4.838 5.774 5.515 3 3/16 3.252 3.124
3 1/2 3.500 4 5 3/8 5.375 5.200 6.207 5.928 3 7/16 3.506 3.370
3 3/4 3.750 4 5 3/4 5.750 5.562 5.562 6.341 3 11/16 3.670 3.616
4 4.000 4 6 1/8 6.125 5.925 5.925 6.755 3 15/16 4.014 3.862
  1. All dimensions are in inches.
DH Heavy Hex Nut, Galvanized
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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
3/8 16 11/16 0.3594 NDHG0370000-I In Stock $0.06555/EA EA
1/2 13 7/8 0.4844 NDHG0500000-I In Stock $0.22033/EA EA
5/8 11 1 1/16 0.6094 NDHG0620000-I In Stock $0.46444/EA EA
3/4 10 1 1/4 0.7344 NDHG0750000-I In Stock $0.78705/EA EA
7/8 9 1 7/16 0.8594 NDHG0870000-I In Stock $1.25556/EA EA
1 8 1 5/8 0.9844 NDHG1000000-I In Stock $1.54602/EA EA
1 1/8 7 1 13/16 1.1094 NDHG1120000-I In Stock $2.47812/EA EA
1 1/4 7 2 1.2188 NDHG1250000-I In Stock $3.653/EA EA
1 3/8 6 2 3/16 1.3438 NDHG1370000-I In Stock $7.34616/EA EA
1 1/2 6 2 3/8 1.4688 NDHG1500000-I In Stock $5.4925/EA EA
1 3/4 5 2 3/4 0.9688 NDHG1750000-I In Stock $10.60517/EA EA