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.

Technical Data

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. To determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread.
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. 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
Grade	Material	% by weight	% by weight	% by weight	% by weight
DH (1)	Carbon & Alloy Steel	0.20-0.55	0.60	0.04	0.05

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

Dimensional SpecificationsGrade DH

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

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
3/8	16	11/16	0.3594	NDHG0370000-I	In Stock	$0.06555/EA	EA	EA
1/2	13	7/8	0.4844	NDHG0500000-I	In Stock	$0.22233/EA	EA	EA
5/8	11	1 1/16	0.6094	NDHG0620000-I	In Stock	$0.42498/EA	EA	EA
3/4	10	1 1/4	0.7344	NDHG0750000-I	In Stock	$0.75523/EA	EA	EA
7/8	9	1 7/16	0.8594	NDHG0870000-I	In Stock	$1.15946/EA	EA	EA
1	8	1 5/8	0.9844	NDHG1000000-I	In Stock	$1.47271/EA	EA	EA
1 1/8	7	1 13/16	1.1094	NDHG1120000-I	In Stock	$2.47812/EA	EA	EA
1 1/4	7	2	1.2188	NDHG1250000-I	In Stock	$2.76599/EA	EA	EA
1 3/8	6	2 3/16	1.3438	NDHG1370000-I	In Stock	$7.34616/EA	EA	EA
1 1/2	6	2 3/8	1.4688	NDHG1500000-I	In Stock	$5.49203/EA	EA	EA
1 3/4	5	2 3/4	0.9688	NDHG1750000-I	In Stock	$10.60517/EA	EA	EA

DH Heavy Hex Nut, Galvanized

Technical Data

Tab 1

Governing StandardsGrade DH

Tab 2

Mechanical PropertiesGrade DH

Tab 3

Chemical PropertiesGrade DH

Tab 4

Dimensional SpecificationsGrade DH

Product Specification

Diameter

Thread Pitch

Use

Width Across Flats