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2H Heavy Hex Nut

ASTM A194 Grade 2H heavy hex nuts are intended for use in flange bolting applications, as well as structural applications and with other high strength bolting. 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 "2H" and the manufacturer's identification mark. They are a common high strength nut used with many different bolting grades, including A193 Grade B7, F3125 Grades A325 and A490, as well as with F1554 Grade 105 anchor bolts and studs. 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 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

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

1/4

1/2

0.2344

N2HB0250000-I

In Stock

$0.08972/EA

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1/4-20 A194 2H HEAVY HEX NUT

$0.08972/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.08972/EA
870	$0.08573/EA
3450	$0.07609/EA
15520	$0.05895/EA

5/16

9/16

0.2969

N2HB0310000-I

In Stock

$0.04539/EA

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5/16-18 A194 2H HEAVY HEX NUT

$0.04539/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.04539/EA
590	$0.04337/EA
2330	$0.03849/EA
10470	$0.02982/EA

3/8

11/16

0.3594

N2HB0370000-I

In Stock

$0.06473/EA

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3/8-16 A194 2H HEAVY HEX NUT

$0.06473/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.06473/EA
320	$0.06185/EA
1280	$0.0549/EA
5740	$0.04253/EA

7/16

3/4

0.4219

N2HB0430000-I

In Stock

$0.11865/EA

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7/16-14 A194 2H HEAVY HEX NUT

$0.11865/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.11865/EA
250	$0.11337/EA
970	$0.10063/EA
4330	$0.07796/EA

1/2

7/8

0.4844

N2HB0500000-I

In Stock

$0.14364/EA

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1/2-13 A194 2H HEAVY HEX NUT

$0.14364/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.14364/EA
160	$0.13725/EA
620	$0.12182/EA
2760	$0.09438/EA

9/16

15/16

0.5469

N2HB0560000-I

In Stock

$0.468/EA

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9/16-12 A194 2H HEAVY HEX NUT

$0.468/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.468/EA
130	$0.44718/EA
500	$0.39691/EA
2210	$0.30751/EA

5/8

1 1/16

0.6094

N2HB0620000-I

In Stock

$0.24103/EA

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5/8-11 A194 2H HEAVY HEX NUT

$0.24103/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.24103/EA
90	$0.23031/EA
340	$0.20442/EA
1520	$0.15838/EA

3/4

1 1/4

0.7344

N2HB0750000-I

3-5 Working Days

$0.43091/EA

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3/4-10 A194 2H HEAVY HEX NUT

$0.43091/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.43091/EA
60	$0.41174/EA
210	$0.36545/EA
940	$0.28314/EA

7/8

1 7/16

0.8594

N2HB0870000-I

In Stock

$0.61805/EA

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7/8-9 A194 2H HEAVY HEX NUT

$0.61805/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.61805/EA
40	$0.59055/EA
140	$0.52416/EA
610	$0.4061/EA

1 5/8

0.9844

N2HB1000000-I

In Stock

$0.99774/EA

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1-8 A194 2H HEAVY HEX NUT

$0.99774/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.99774/EA
25	$0.95335/EA
100	$0.84618/EA
500	$0.65559/EA

1 1/8

1 13/16

1.1094

N2HB112NC00-I

In Stock

$1.72333/EA

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1 1/8-7 A194 2H HEAVY HEX NUT

$1.72333/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.72333/EA
25	$1.6256/EA
70	$1.43316/EA
500	$1.00946/EA

1 1/4

1.2188

N2HB125NC00-I

In Stock

$2.45756/EA

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1 1/4-7 A194 2H HEAVY HEX NUT

$2.45756/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.45756/EA
25	$2.31818/EA
60	$2.04376/EA
500	$1.43954/EA

1 3/8

2 3/16

1.3438

N2HB137NC00-I

In Stock

$5.06357/EA

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1 3/8-6 A194 2H HEAVY HEX NUT

$5.06357/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.06357/EA
40	$4.77639/EA
80	$4.21097/EA
180	$2.96604/EA

1 1/2

2 3/8

1.4688

N2HB150NC00-I

In Stock

$4.32587/EA

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1 1/2-6 A194 2H HEAVY HEX NUT

$4.32587/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.32587/EA
40	$4.08053/EA
70	$3.59749/EA
140	$2.53392/EA

1 5/8

5.5

2 9/16

1.5938

N2HB162NC00-I

In Stock

$9.72805/EA

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1 5/8-5.5 A194 2H HEAVY HEX NUT

$9.72805/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.72805/EA
30	$9.17633/EA
50	$8.09005/EA
120	$5.69831/EA

1 3/4

2 3/4

1.7188

N2HB175NC00-I

In Stock

$6.81183/EA

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1 3/4-5 A194 2H HEAVY HEX NUT

$6.81183/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.81183/EA
20	$6.42551/EA
40	$5.66486/EA
90	$3.9901/EA

1 7/8

2 15/16

1.8438

N2HB187NC00-I

In Stock

$12.10806/EA

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1 7/8-5 A194 2H HEAVY HEX NUT

$12.10806/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$12.10806/EA
20	$11.42137/EA
40	$10.06932/EA
80	$7.09242/EA

3 1/8

1.9688

N2HB200NC00-I

In Stock

$9.80175/EA

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2-4.5 A194 2H HEAVY HEX NUT

$9.80175/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.80175/EA
20	$9.24586/EA
30	$8.15135/EA
70	$5.74148/EA

2 1/4

4.5

3 1/2

2.2031

N2HB225NC00-I

In Stock

$22.77868/EA

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2 1/4-4.5 A194 2H HEAVY HEX NUT

$22.77868/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$22.77868/EA
10	$21.48682/EA
20	$18.94324/EA
50	$13.34285/EA

2 1/2

3 7/8

2.4531

N2HB250NC00-I

In Stock

$29.60315/EA

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2 1/2-4 A194 2H HEAVY HEX NUT

$29.60315/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$29.60315/EA
10	$27.92425/EA
20	$24.61862/EA
40	$17.34036/EA

2 3/4

4 1/4

2.7031

N2HB275NC00-I

In Stock

$37.4013/EA

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2 3/4-4 A194 2H HEAVY HEX NUT

$37.4013/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$37.4013/EA
10	$35.28013/EA
20	$31.10373/EA
40	$21.9082/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		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

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

2H Heavy Hex Nut

Technical Data

Governing Standards

Governing StandardsGrade 2H

Mechanical Properties

Mechanical PropertiesGrade 2H

Chemical Properties

Chemical PropertiesGrade 2H

Dimensional Specifications

Dimensional SpecificationsGrade 2H

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Height of Nut

Width Across Flats

Width Across Points

1/4-20 A194 2H HEAVY HEX NUT

5/16-18 A194 2H HEAVY HEX NUT

3/8-16 A194 2H HEAVY HEX NUT

7/16-14 A194 2H HEAVY HEX NUT

1/2-13 A194 2H HEAVY HEX NUT

9/16-12 A194 2H HEAVY HEX NUT

5/8-11 A194 2H HEAVY HEX NUT

3/4-10 A194 2H HEAVY HEX NUT

7/8-9 A194 2H HEAVY HEX NUT

1-8 A194 2H HEAVY HEX NUT

1 1/8-7 A194 2H HEAVY HEX NUT

1 1/4-7 A194 2H HEAVY HEX NUT

1 3/8-6 A194 2H HEAVY HEX NUT

1 1/2-6 A194 2H HEAVY HEX NUT

1 5/8-5.5 A194 2H HEAVY HEX NUT

1 3/4-5 A194 2H HEAVY HEX NUT

1 7/8-5 A194 2H HEAVY HEX NUT

2-4.5 A194 2H HEAVY HEX NUT

2 1/4-4.5 A194 2H HEAVY HEX NUT

2 1/2-4 A194 2H HEAVY HEX NUT

2 3/4-4 A194 2H HEAVY HEX NUT