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2HM Heavy Hex Nut

ASTM A194 Grade 2HM heavy hex nuts are quenched and tempered alloy steel nuts and are 100% hardness tested. ASTM A194 covers carbon steel, alloy steel, and stainless steel nuts for bolts in high pressure or high temperature service. Grade markings consists of both the grade symbol "2HM" and the manufacturer's identification mark. They are usually paired with A193 Grade B7M fasteners in applications where hydrogen sulfide gas exposure may lead to hydrogen embrittlement problems. Dimensional specifications are governed by ASME B18.2.2. Heavy hex nuts provide increased bearing surface area over finished nuts such as J995 Grade 5 nuts.

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Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade 2HM

Per ASME B18.2.2-2015
Nominal Diameter		UNC	UN8	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	1.250	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	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	8	2	2.000	1.380	2.309	2.209	1 7/32	1.251	1.187
1 3/8	1.375	6	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	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	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	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	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	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	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	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	8	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647
3	3.000	4	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	8	5	5.000	4.838	5.774	5.515	3 3/16	3.252	3.124
3 1/2	3.500	4	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	8	5 3/4	5.750	5.562	5.562	6.341	3 11/16	3.670	3.616
4	4.000	4	8	6 1/8	6.125	5.925	5.925	6.755	3 15/16	4.014	3.862

All dimensions are in inches.

2HM Heavy Hex Nut

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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM

1/2

7/8

0.4844

N2HM0500000-I

In Stock

$0.35067/EA

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1/2-13 A194 GRADE 2HM HEAVY HEX NUT

$0.35067/EA

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Quantity	Price
Quantity	Price
1	$0.35067/ EA
160	$0.33507/ EA
620	$0.2974/ EA
2760	$0.23042/ EA

5/8

1 1/16

0.6094

N2HM0620000-I

In Stock

$0.80113/EA

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5/8-11 A194 GRADE 2HM HEAVY HEX NUT

$0.80113/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.80113/ EA
90	$0.76548/ EA
340	$0.67943/ EA
1520	$0.5264/ EA

3/4

1 1/4

0.7344

N2HM0750000-I

In Stock

$0.90745/EA

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3/4-10 A194 GRADE 2HM HEAVY HEX NUT

$0.90745/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.90745/ EA
60	$0.86707/ EA
210	$0.7696/ EA
940	$0.59626/ EA

7/8

1 7/16

0.8594

N2HM0870000-I

In Stock

$1.2272/EA

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7/8-9 A194 GRADE 2HM HEAVY HEX NUT

$1.2272/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$1.2272/ EA
40	$1.1726/ EA
140	$1.04078/ EA
610	$0.80636/ EA

1 5/8

0.9844

N2HM1000000-I

In Stock

$1.80367/EA

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1-8 A194 GRADE 2HM HEAVY HEX NUT

$1.80367/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$1.80367/ EA
25	$1.72341/ EA
100	$1.52968/ EA
500	$1.18514/ 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.

Carbon Steel, Quenched & Tempered, 100% Hardness Tested			Per ASTM A194/A194M-16
Proof Load Stress (psi) min	Hardness	Hardness	Tempering Temperature
Min psi	Brinell	Rockwell (B Scale)	Min
150,000	159 to 235	84 to 99	1150F
150,000	159 to 235	84 to 99	1150F

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
2HM	Carbon Steel	0.40 min	1.00 max	0.040 max	0.050 max	0.04 max

2HM Heavy Hex Nut

Technical Data

Governing Standards

Governing StandardsGrade 2HM

Mechanical Properties

Mechanical PropertiesGrade 2HM

Chemical Properties

Chemical PropertiesGrade 2HM

Dimensional Specifications

Dimensional SpecificationsGrade 2HM

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1/2-13 A194 GRADE 2HM HEAVY HEX NUT

5/8-11 A194 GRADE 2HM HEAVY HEX NUT

3/4-10 A194 GRADE 2HM HEAVY HEX NUT

7/8-9 A194 GRADE 2HM HEAVY HEX NUT

1-8 A194 GRADE 2HM HEAVY HEX NUT