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2H Heavy Hex Nut, Mechanical Galvanized

ASTM A194 Grade 2H heavy hex nuts are high-strength, heat-treated nuts designed for demanding applications, including flange bolting, structural connections, and use with high-strength bolts. These carbon and alloy steel nuts are ideal for high-pressure and high-temperature environments and are commonly paired with bolts like ASTM A193 Grade B7, F3125 Grade A325, and F1554 Grade 105. Featuring a larger bearing surface than standard hex nuts, they offer enhanced load distribution and durability. Each nut is marked with the "2H" grade symbol and the manufacturer's ID for traceability. Finished with a mechanically galvanized coating, they offer reliable corrosion resistance and meet dimensional standards set by ASME B18.2.2.

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Governing Standards
Chemical Properties
Mechanical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade 2H

Per ASME B18.2.2-2015
Nominal Diameter		UNC	UNF	UN8	F			G		H
					Width Across Flats			Width Across Corners		Thickness
					Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	0.250	20	28		1/2	0.500	0.488	0.577	0.556	15/64	0.250	0.218
5/16	0.313	18	24		9/16	0.562	0.546	0.650	0.220	19/64	0.314	0.280
3/8	0.375	16	24		11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341
7/16	0.438	14	20		3/4	0.750	0.728	0.866	0.830	27/64	0.441	0.403
1/2	0.500	13	20		7/8	0.875	0.850	1.010	0.990	31/64	0.504	0.464
9/16	0.563	12	18		15/16	0.938	0.909	1.083	1.037	35/64	0.568	0.526
5/8	0.625	11	18		1 1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587
3/4	0.750	10	16		1 1/4	1.250	1.212	1.443	1.382	47/64	0.758	0.710
7/8	0.875	9	14		1 7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833
1	1.000	8	14		1 5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956
1 1/8	1.125	7	12	8	1 13/16	1.812	1.756	2.093	2.002	1 7/64	1.139	1.079
1 1/4	1.250	7	12	8	2	2.000	1.380	2.309	2.209	1 7/32	1.251	1.187
1 3/8	1.375	6	12	8	2 3/16	2.188	2.119	2.526	2.416	1 11/32	1.378	1.310
1 1/2	1.500	6	12	8	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	12	8	2 9/16	2.562	2.481	2.959	2.828	1 19/32	1.632	1.556
1 3/4	1.750	5	12	8	2 3/4	2.750	2.662	3.175	3.035	1 23/32	1.759	1.679
1 7/8	1.875	5	12	8	2 15/16	2.938	2.844	3.392	3.242	1 27/32	1.886	1.802
2	2.000	4 1/2	12	8	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	12	8	3 1/2	3.500	3.388	4.041	3.862	2 13/64	2.251	2.155
2 1/2	2.500	4	12	8	3 7/8	3.875	3.750	4.474	4.275	2 29/64	2.505	2.401
2 3/4	2.750	4	12	8	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647
3	3.000	4	12	8	4 5/8	4.625	4.475	5.340	5.102	2 61/64	3.013	2.893
3 1/4	3.250	4	12	8	5	5.000	4.838	5.774	5.515	3 3/16	3.252	3.124
3 1/2	3.500	4	12	8	5 3/8	5.375	5.200	6.207	5.928	3 7/16	3.506	3.370
3 3/4	3.750	4	12	8	5 3/4	5.750	5.562	5.562	6.341	3 11/16	3.670	3.616
4	4.000	4	12	8	6 1/8	6.125	5.925	5.925	6.755	3 15/16	4.014	3.862

All dimensions are in inches.

2H Heavy Hex Nut, Mechanical Galvanized

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1/2

7/8

N2HG050MG00-I

12-15 Working Days

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1/2-13 A194 2H Heavy Hex Nut, Mechanical Galvanized

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160	$0.76998/EA
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1 1/16

N2HG062MG00-I

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5/8-11 A194 2H Heavy Hex Nut, Mechanical Galvanized

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1	$11.01153/EA
90	$10.26729/EA
340	$9.69528/EA
1510	$6.5953/EA

3/4

1 1/4

N2HG075MG00-I

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$1.30156/EA

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3/4-10 A194 2H Heavy Hex Nut, Mechanical Galvanized

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60	$1.21359/EA
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1 7/16

N2HG087MG00-I

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7/8-9 A194 2H Heavy Hex Nut, Mechanical Galvanized

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40	$2.52248/EA
140	$2.38195/EA
610	$1.62034/EA

1 5/8

N2HG100MG00-I

16 In Stock

$4.09992/EA

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1-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

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16 In Stock

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25	$3.82282/EA
100	$3.60984/EA
500	$2.45562/EA

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N2HG112MG00-I

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1 1/8-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

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25	$4.43066/EA
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500	$2.84608/EA

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N2HG125MG00-I

372 In Stock

$7.78558/EA

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25	$7.25937/EA
60	$6.85494/EA
500	$4.66313/EA

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2 3/16

N2HG137MG00-I

451 In Stock

$7.34007/EA

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1 3/8-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

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451 In Stock

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1	$7.34007/EA
40	$6.92379/EA
80	$6.10416/EA
180	$4.29952/EA

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2 3/8

N2HG150MG00-I

97 In Stock

$10.72423/EA

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1 1/2-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

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97 In Stock

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Quantity	Price
1	$10.72423/EA
40	$9.9994/EA
70	$9.44231/EA
140	$6.42322/EA

ASTM A194	This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1⁄4 in. and M6 nominal and above. These nuts are intended for high-pressure or high temperature service, or both. Grade substitutions without the purchaser’s permission are not allowed.
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.

Per ASTM A194/A194M-16
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur (1)	Silicon
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight
2H	Carbon Steel	0.40 min	1.00 max	0.040 max	0.050 max	0.04 max

Carbon Steel, Quenched & Tempered		Per ASTM A194/A194M-16
Diameter	Proof Load Stress	Core Hardness		Tempering Temperature
	Min psi	Rockwell		Min
		Min	Max
1/4" thru 1 1/2"	175,000	C24	C35	850F
Over 1 1/2"	175,000		C35	850F

2H Heavy Hex Nut, Mechanical Galvanized

Technical Data

Governing Standards

Governing StandardsGrade 2H

Chemical Properties

Chemical PropertiesGrade 2H

Mechanical Properties

Mechanical PropertiesGrade 2H

Dimensional Specifications

Dimensional SpecificationsGrade 2H

Diameter

Thread Pitch

Use

Thread Type

Width Across Flats

1/2-13 A194 2H Heavy Hex Nut, Mechanical Galvanized

5/8-11 A194 2H Heavy Hex Nut, Mechanical Galvanized

3/4-10 A194 2H Heavy Hex Nut, Mechanical Galvanized

7/8-9 A194 2H Heavy Hex Nut, Mechanical Galvanized

1-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

1 1/8-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

1 1/4-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

1 3/8-8 A194 2H Heavy Hex Nut, Mechanical Galvanized

1 1/2-8 A194 2H Heavy Hex Nut, Mechanical Galvanized