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Grade 8M SS Heavy Hex Nut

ASTM A194 Grade 8M heavy hex nuts are manufactured from AISI 316 grade stainless steel and tested to meet ASTM A194 Grade 8M. Dimensional specifications are governed by ASME B18.2.2. Grade markings for A194 Grade 8M heavy hex nuts consists of the number/letter combination of 8M. Grade 8M stainless steel heavy hex nuts are intended for use in high-pressure and/or high-temperature service with ASTM A193 and A320 bolting of similar material, such as B8M and B8M Class 2. Heavy hex nuts provide increased bearing surface area over finished nuts.

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Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade 8M 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 8M SS Heavy Hex Nut

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

1/4

1/2

NH8M0250000-I

In Stock

$0.11749/EA

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

$0.11749/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.11749/EA
860	$0.11097/EA
3420	$0.09946/EA
15350	$0.09542/EA

5/16

9/16

NH8M0310000-I

In Stock

$0.23502/EA

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

$0.23502/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.23502/EA
580	$0.22198/EA
2310	$0.19897/EA
10360	$0.19088/EA

3/8

11/16

NH8M0370000-I

In Stock

$0.6615/EA

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

$0.6615/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.6615/EA
320	$0.62479/EA
1270	$0.56003/EA
5680	$0.53726/EA

7/16

3/4

NH8M0430000-I

In Stock

$0.59831/EA

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

$0.59831/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.59831/EA
240	$0.56511/EA
960	$0.50653/EA
4280	$0.48593/EA

1/2

7/8

NH8M0500000-I

In Stock

$0.70009/EA

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

$0.70009/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.70009/EA
160	$0.66124/EA
610	$0.5927/EA
2730	$0.5686/EA

9/16

15/16

NH8M0560000-I

In Stock

$3.7309/EA

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

$3.7309/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$3.7309/EA
130	$3.52386/EA
490	$3.15858/EA
2190	$3.03016/EA

5/8

1 1/16

NH8M0620000-I

In Stock

$1.24597/EA

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

$1.24597/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.24597/EA
90	$1.17683/EA
340	$1.05483/EA
1500	$1.01195/EA

3/4

1 1/4

NH8M0750000-I

In Stock

$1.93485/EA

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

$1.93485/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.93485/EA
60	$1.82748/EA
210	$1.63804/EA
930	$1.57144/EA

7/8

1 7/16

NH8M0870000-I

In Stock

$3.59948/EA

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

$3.59948/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.59948/EA
40	$3.39973/EA
140	$3.04731/EA
600	$2.92342/EA

1 5/8

NH8M1000000-I

In Stock

$4.2639/EA

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

$4.2639/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$4.2639/EA
25	$4.02728/EA
100	$3.60981/EA
500	$3.46305/EA

1 1/8

1 13/16

NH8M112NC00-I

3-5 Working Days

$8.53702/EA

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

$8.53702/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$8.53702/EA
25	$8.06326/EA
70	$7.22742/EA
500	$6.93358/EA

1 1/8

1 13/16

NH8M1120000-I

3-5 Working Days

$9.55095/EA

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

$9.55095/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$9.55095/EA
25	$9.02093/EA
70	$8.08581/EA
500	$7.75707/EA

1 1/4

NH8M125NC00-I

In Stock

$8.1247/EA

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

$8.1247/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$8.1247/EA
25	$7.67383/EA
60	$6.87835/EA
500	$6.5987/EA

1 1/4

NH8M1250000-I

3-5 Working Days

$10.00787/EA

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

$10.00787/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$10.00787/EA
25	$9.4525/EA
60	$8.47264/EA
500	$8.12817/EA

1 3/8

2 3/16

NH8M1370000-I

3-5 Working Days

$18.31474/EA

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

$18.31474/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$18.31474/EA
40	$17.29838/EA
80	$15.50521/EA
180	$14.87482/EA

1 1/2

2 3/8

NH8M150NC00-I

In Stock

$10.81081/EA

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

$10.81081/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$10.81081/EA
40	$10.21088/EA
70	$9.15241/EA
140	$8.7803/EA

1 1/2

2 3/8

NH8M1500000-I

In Stock

$18.5411/EA

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

$18.5411/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$18.5411/EA
40	$17.51219/EA
70	$15.69686/EA
140	$15.05868/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 316	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	Molybdenum
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
8M	Type 316 Stainless Steel	0.08 max	2.00 max	0.045 max	0.030 max	1.00 max	16.0-18.0	10.0-14.0	2.00-3.00

Grade 8M SS Heavy Hex Nut

Technical Data

Governing Standards

Governing StandardsGrade 8M Stainless Steel

Mechanical Properties

Mechanical PropertiesGrade 8M Stainless Steel

Chemical Properties

Chemical PropertiesGrade 8M Stainless Steel

Dimensional Specifications

Dimensional SpecificationsGrade 8M Stainless Steel

Grade

Diameter

Thread Pitch

Thread Type

Width Across Flats

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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