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Grade 8 SS Heavy Hex Nut

ASTM A194 Grade 8 heavy hex nuts are manufactured from AISI 304 grade stainless steel, and tested to meet ASTM A194 Grade 8. Dimensional specifications are governed by ASME B18.2.2. Grade markings for A194 Grade 8 heavy hex nuts consists of the number 8. Grade 8 stainless steel heavy hex nuts are intended for use in high-pressure and/or high-temperature service with ASTM A193 bolting of similar material, such as B8 and B8 Class 2. Heavy hex nuts provide increased bearing surface area over finished nuts.

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Governing Standards
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Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade 8 Stainless Steel

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 8 SS 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

NHB80250000-I

In Stock

$0.08555/EA

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1/4-20 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.08555/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.08555/EA
860	$0.0808/EA
3420	$0.07242/EA
15390	$0.06948/EA

5/16

9/16

0.2969

NHB80310000-I

In Stock

$0.09401/EA

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5/16-18 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.09401/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.09401/EA
580	$0.08879/EA
2300	$0.07959/EA
10350	$0.07635/EA

3/8

11/16

0.3594

NHB80370000-I

In Stock

$0.28541/EA

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3/8-16 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.28541/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28541/EA
320	$0.26957/EA
1270	$0.24162/EA
5680	$0.2318/EA

7/16

3/4

0.4219

NHB80430000-I

In Stock

$0.67669/EA

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7/16-14 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.67669/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.67669/EA
240	$0.63913/EA
960	$0.57288/EA
4280	$0.54959/EA

1/2

7/8

0.4844

NHB80500000-I

In Stock

$0.39812/EA

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1/2-13 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.39812/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.39812/EA
160	$0.37603/EA
610	$0.33705/EA
2730	$0.32334/EA

9/16

15/16

0.5469

NHB80560000-I

In Stock

$1.52369/EA

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9/16-12 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$1.52369/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.52369/EA
130	$1.43913/EA
490	$1.28995/EA
2190	$1.23751/EA

5/8

1 1/16

0.6094

NHB80620000-I

In Stock

$0.68987/EA

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5/8-11 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$0.68987/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.68987/EA
90	$0.65159/EA
340	$0.58404/EA
1500	$0.5603/EA

3/4

1 1/4

0.7344

NHB80750000-I

In Stock

$1.53535/EA

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3/4-10 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$1.53535/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.53535/EA
60	$1.45014/EA
210	$1.29982/EA
930	$1.24697/EA

7/8

1 7/16

0.8594

NHB80870000-I

In Stock

$2.60477/EA

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7/8-9 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$2.60477/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.60477/EA
40	$2.46022/EA
140	$2.20519/EA
600	$2.11554/EA

1 5/8

0.9844

NHB81000000-I

In Stock

$3.41805/EA

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1-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$3.41805/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.41805/EA
25	$3.22837/EA
100	$2.89371/EA
500	$2.77606/EA

1 1/8

1 13/16

1.1094

NHB8112NC00-I

In Stock

$4.28364/EA

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1 1/8-7 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$4.28364/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.28364/EA
25	$4.04593/EA
70	$3.62652/EA
500	$3.47908/EA

1 1/8

1 13/16

1.1094

NHB81120000-I

In Stock

$5.1902/EA

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1 1/8-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$5.1902/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.1902/EA
25	$4.90218/EA
70	$4.39401/EA
500	$4.21537/EA

1 1/4

1.2188

NHB8125NC00-I

In Stock

$7.19622/EA

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1 1/4-7 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$7.19622/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.19622/EA
25	$6.79687/EA
60	$6.0923/EA
500	$5.84461/EA

1 1/4

1.2188

NHB81250000-I

In Stock

$6.3678/EA

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1 1/4-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$6.3678/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.3678/EA
25	$6.01443/EA
60	$5.39097/EA
500	$5.17179/EA

1 3/8

3 15/16

1.3438

NHB8137NC00-I

3-5 Working Days

$37.97415/EA

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1 3/8-6 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$37.97415/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$37.97415/EA
40	$35.86681/EA
80	$32.14883/EA
180	$30.84176/EA

1 3/8

3 15/16

1.3438

NHB81370000-I

In Stock

$9.51083/EA

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1 3/8-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$9.51083/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.51083/EA
40	$8.98304/EA
80	$8.05185/EA
180	$7.72449/EA

1 1/2

2 3/8

1.4688

NHB8150NC00-I

In Stock

$13.28392/EA

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1 1/2-6 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$13.28392/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$13.28392/EA
40	$12.54675/EA
70	$11.24614/EA
140	$10.78891/EA

1 1/2

2 3/8

1.4688

NHB81500000-I

In Stock

$12.32712/EA

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1 1/2-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$12.32712/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$12.32712/EA
40	$11.64304/EA
70	$10.43611/EA
140	$10.01182/EA

1 5/8

2 9/16

1.5938

NHB81620000-I

In Stock

$12.72367/EA

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1 5/8-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$12.72367/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$12.72367/EA
30	$12.01758/EA
50	$10.77183/EA
110	$10.33388/EA

1 3/4

2 3/4

1.7187

NHB81750000-I

In Stock

$17.83377/EA

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1 3/4-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$17.83377/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$17.83377/EA
20	$16.84411/EA
40	$15.09803/EA
90	$14.4842/EA

1 7/8

2 15/16

1.8437

NHB81870000-I

In Stock

$21.1475/EA

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1 7/8-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$21.1475/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$21.1475/EA
20	$19.97394/EA
40	$17.90342/EA
80	$17.17553/EA

3 1/8

1.9687

NHB82000000-I

In Stock

$18.6604/EA

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2-8 A194 GRADE 8 STAINLESS STEEL HEAVY HEX NUT

$18.6604/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$18.6604/EA
20	$17.62486/EA
30	$15.79785/EA
60	$15.15556/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.

Stainless AISI 304	Per ASTM A194/A194M-16
Diameter	Proof Load Stress	Core Hardness
Diameter	Min psi	Rockwell
1/4" thru 4"	80,000	C32 max

Per ASTM A194/A194M-16
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur (1)	Silicon	Chromium	Nickel
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
8	Type 304 Stainless Steel	0.08 max	2.00 max	0.045 max	0.030 max	1.00 max	18.0-20.0	8.0-11.0