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Grade 7L Heavy Hex Nut

ASTM A194 Grade 7L heavy hex nuts are manufactured from alloy steel, quenched and tempered. The ASTM A194 specification covers carbon steel, alloy steel, and stainless steel nuts for bolts in high pressure or high temperature service. They are a common high strength nut used with stud bolts for high and low temperature service, such as B16 and L7. When low temperature requirements are specified for Grade 7 nuts, the Charpy test procedures and requirements as defined in Specification A320/A320M for Grade L7 will apply. Grade markings consists of the grade symbol "7L". 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 7

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	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	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.

Grade 7L 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

NHG70500000-I

In Stock

$0.47718/EA

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1/2-13 S3 A194 GRADE 7L HEAVY HEX NUT

$0.47718/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.47718/ EA
160	$0.45595/ EA
620	$0.40469/ EA
2760	$0.31354/ EA

5/8

1 1/16

0.6094

NHG70620000-I

In Stock

$0.83412/EA

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5/8-11 S3 A194 GRADE 7L HEAVY HEX NUT

$0.83412/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.83412/ EA
90	$0.797/ EA
340	$0.70741/ EA
1520	$0.54808/ EA

3/4

1 1/4

0.7344

NHG70750000-I

In Stock

$0.75947/EA

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3/4-10 S3 A194 GRADE 7L HEAVY HEX NUT

$0.75947/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.75947/ EA
60	$0.72568/ EA
210	$0.64411/ EA
940	$0.49903/ EA

7/8

1 7/16

0.8594

NHG70870000-I

In Stock

$1.65786/EA

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7/8-9 S3 A194 GRADE 7L HEAVY HEX NUT

$1.65786/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.65786/ EA
40	$1.5841/ EA
140	$1.40602/ EA
610	$1.08934/ EA

1 5/8

0.9844

NHG71000000-I

In Stock

$1.50307/EA

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1-8 S3 A194 GRADE 7L HEAVY HEX NUT

$1.50307/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.50307/ EA
25	$1.43619/ EA
100	$1.27474/ EA
500	$0.98762/ EA

1 1/8

1 13/16

1.1094

NHG71120000-I

In Stock

$4.20913/EA

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1 1/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

$4.20913/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$4.20913/ EA
25	$4.02185/ EA
70	$3.56974/ EA
500	$2.76571/ EA

1 1/4

1.2188

NHG71250000-I

In Stock

$3.01478/EA

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1 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

$3.01478/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$3.01478/ EA
25	$2.88064/ EA
60	$2.55681/ EA
500	$1.98093/ EA

1 3/8

2 3/16

1.3438

NHG71370000-I

In Stock

$3.53195/EA

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1 3/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

$3.53195/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.53195/ EA
40	$3.3748/ EA
80	$2.99543/ EA
180	$2.32075/ EA

1 1/2

2 3/8

1.4688

NHG71500000-I

In Stock

$7.72582/EA

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1 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT

$7.72582/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.72582/ EA
40	$7.38207/ EA
70	$6.55222/ EA
140	$5.07643/ EA

1 5/8

2 9/16

1.5938

NHG71620000-I

In Stock

$7.21729/EA

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1 5/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

$7.21729/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.21729/ EA
30	$6.89617/ EA
50	$6.12094/ EA
120	$4.74229/ EA

1 3/4

2 3/4

1.7187

NHG71750000-I

In Stock

$17.68096/EA

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1 3/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

$17.68096/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$17.68096/ EA
20	$16.89427/ EA
40	$14.99511/ EA
90	$11.61769/ EA

1 7/8

2 15/16

1.8437

NHG71870000-I

In Stock

$11.8015/EA

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1 7/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

$11.8015/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$11.8015/ EA
20	$11.27641/ EA
40	$10.00878/ EA
80	$7.75445/ EA

3 1/8

1.9687

NHG72000000-I

In Stock

$21.05795/EA

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2-8 S3 A194 GRADE 7L HEAVY HEX NUT

$21.05795/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$21.05795/ EA
20	$20.12101/ EA
30	$17.85912/ EA
70	$13.83663/ EA

2 1/4

3 1/2

2.2031

NHG72250000-I

In Stock

$24.43562/EA

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2 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

$24.43562/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$24.43562/ EA
10	$23.34839/ EA
20	$20.7237/ EA
50	$16.056/ EA

2 1/2

3 7/8

2.4531

NHG72500000-I

In Stock

$27.86538/EA

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2 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT

$27.86538/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$27.86538/ EA
10	$26.62555/ EA
20	$23.63245/ EA
40	$18.3096/ 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.

Alloy Steel	Per ASTM A194/A194M-16
Diameter	Proof Load Stress	Core Hardness
Diameter	Min psi	Rockwell
1/4" thru 4"	175,000	C24 to C35

Per ASTM A194/A194M-16
Grade	Carbon	Manganese	Phosphorus	Sulfur (1)	Silicon	Chromium	Molybdenum
Grade	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
7	0.38-0.48	0.75-1.00	0.035 max	0.040 max	0.15-0.35	0.80-1.10	0.15-0.25

Grade 7L Heavy Hex Nut

Technical Data

Governing Standards

Governing StandardsGrade 7

Mechanical Properties

Mechanical PropertiesGrade 7

Chemical Properties

Chemical PropertiesGrade 7

Dimensional Specifications

Dimensional SpecificationsGrade 7

Diameter

Thread Pitch

Thread Type

Width Across Flats

1/2-13 S3 A194 GRADE 7L HEAVY HEX NUT

5/8-11 S3 A194 GRADE 7L HEAVY HEX NUT

3/4-10 S3 A194 GRADE 7L HEAVY HEX NUT

7/8-9 S3 A194 GRADE 7L HEAVY HEX NUT

1-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 3/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 5/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 3/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

1 7/8-8 S3 A194 GRADE 7L HEAVY HEX NUT

2-8 S3 A194 GRADE 7L HEAVY HEX NUT

2 1/4-8 S3 A194 GRADE 7L HEAVY HEX NUT

2 1/2-8 S3 A194 GRADE 7L HEAVY HEX NUT