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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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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 Item # Availability Price Quantity UOM

1/4

1/2

NHB80250000-I

231 In Stock

$0.11293/EA

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1/4-20 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.11293/EA

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231 In Stock

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Quantity	Price
Quantity	Price
1	$0.11293/EA
860	$0.10781/EA
3420	$0.0956/EA
15390	$0.07366/EA

5/16

9/16

NHB80310000-I

2970 In Stock

$0.09401/EA

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5/16-18 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.09401/EA

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2970 In Stock

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Quantity	Price
Quantity	Price
1	$0.09401/EA
580	$0.08975/EA
2300	$0.07959/EA
10350	$0.06132/EA

3/8

11/16

NHB80370000-I

1444 In Stock

$0.2517/EA

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3/8-16 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.2517/EA

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1444 In Stock

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Quantity	Price
Quantity	Price
1	$0.2517/EA
320	$0.2403/EA
1270	$0.21309/EA
5680	$0.16419/EA

7/16

3/4

NHB80430000-I

175 In Stock

$0.67779/EA

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7/16-14 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.67779/EA

Qty

175 In Stock

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Quantity	Price
Quantity	Price
1	$0.67779/EA
240	$0.64707/EA
960	$0.57382/EA
4280	$0.44213/EA

1/2

7/8

NHB80500000-I

10199 In Stock

$0.46717/EA

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1/2-13 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.46717/EA

Qty

10199 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.46717/EA
160	$0.446/EA
610	$0.3955/EA
2730	$0.30474/EA

9/16

15/16

NHB80560000-I

42 In Stock

$1.52369/EA

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9/16-12 A194 Grade 8 Stainless Steel Heavy Hex Nut

$1.52369/EA

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42 In Stock

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Quantity	Price
Quantity	Price
1	$1.52369/EA
130	$1.45463/EA
490	$1.28995/EA
2190	$0.99391/EA

5/8

1 1/16

NHB80620000-I

6059 In Stock

$0.7569/EA

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5/8-11 A194 Grade 8 Stainless Steel Heavy Hex Nut

$0.7569/EA

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6059 In Stock

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Quantity	Price
Quantity	Price
1	$0.7569/EA
90	$0.72259/EA
340	$0.64079/EA
1500	$0.49373/EA

3/4

1 1/4

NHB80750000-I

4638 In Stock

$1.47427/EA

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3/4-10 A194 Grade 8 Stainless Steel Heavy Hex Nut

$1.47427/EA

Qty

4638 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.47427/EA
60	$1.40745/EA
210	$1.24811/EA
930	$0.96167/EA

7/8

1 7/16

NHB80870000-I

2389 In Stock

$2.49678/EA

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7/8-9 A194 Grade 8 Stainless Steel Heavy Hex Nut

$2.49678/EA

Qty

2389 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.49678/EA
40	$2.38362/EA
140	$2.11377/EA
600	$1.62867/EA

1 5/8

NHB81000000-I

1458 In Stock

$4.37878/EA

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1-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$4.37878/EA

Qty

1458 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.37878/EA
25	$4.18032/EA
100	$3.70706/EA
500	$2.85631/EA

1 1/8

1 13/16

NHB8112NC00-I

576 In Stock

$4.25474/EA

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1 1/8-7 A194 Grade 8 Stainless Steel Heavy Hex Nut

$4.25474/EA

Qty

576 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.25474/EA
25	$4.0619/EA
70	$3.60205/EA
500	$2.77539/EA

1 1/8

1 13/16

NHB81120000-I

1679 In Stock

$5.95224/EA

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1 1/8-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$5.95224/EA

Qty

1679 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.95224/EA
25	$5.68248/EA
70	$5.03916/EA
500	$3.88269/EA

1 1/4

NHB8125NC00-I

119 In Stock

$7.19629/EA

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1 1/4-7 A194 Grade 8 Stainless Steel Heavy Hex Nut

$7.19629/EA

Qty

119 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.19629/EA
25	$6.87014/EA
60	$6.09236/EA
500	$4.69419/EA

1 1/4

NHB81250000-I

1277 In Stock

$7.5521/EA

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1 1/4-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$7.5521/EA

Qty

1277 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.5521/EA
25	$7.20983/EA
60	$6.39359/EA
500	$4.92629/EA

1 3/8

3 15/16

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	$36.25309/EA
80	$32.14883/EA
180	$24.77081/EA

1 3/8

3 15/16

NHB81370000-I

606 In Stock

$10.1372/EA

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1 3/8-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$10.1372/EA

Qty

606 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$10.1372/EA
40	$9.67777/EA
80	$8.58213/EA
180	$6.61257/EA

1 1/2

2 3/8

NHB8150NC00-I

51 In Stock

$13.24456/EA

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1 1/2-6 A194 Grade 8 Stainless Steel Heavy Hex Nut

$13.24456/EA

Qty

51 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$13.24456/EA
40	$12.64429/EA
70	$11.21281/EA
140	$8.63952/EA

1 1/2

2 3/8

NHB81500000-I

19 In Stock

$12.9165/EA

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1 1/2-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$12.9165/EA

Qty

19 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$12.9165/EA
40	$12.3311/EA
70	$10.93508/EA
140	$8.42553/EA

1 5/8

2 9/16

NHB81620000-I

173 In Stock

$15.45699/EA

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1 5/8-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$15.45699/EA

Qty

173 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$15.45699/EA
30	$14.75645/EA
50	$13.08585/EA
110	$10.08271/EA

1 3/4

2 3/4

NHB81750000-I

19 In Stock

$21.47318/EA

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1 3/4-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$21.47318/EA

Qty

19 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$21.47318/EA
20	$20.49998/EA
40	$18.17915/EA
90	$14.00711/EA

1 7/8

2 15/16

NHB81870000-I

184 In Stock

$23.4812/EA

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1 7/8-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$23.4812/EA

Qty

184 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$23.4812/EA
20	$22.41698/EA
40	$19.87913/EA
80	$15.31696/EA

3 1/8

NHB82000000-I

1 In Stock

$18.6604/EA

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2-8 A194 Grade 8 Stainless Steel Heavy Hex Nut

$18.6604/EA

Qty

1 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$18.6604/EA
20	$17.81467/EA
30	$15.79785/EA
60	$12.17231/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