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Grade A Heavy Hex Nut

ASTM A563 Grade A heavy hex nuts are made from carbon steel. Dimensional specifications are governed by ASME B18.2.2. Grade markings are not required for A563 Grade A heavy hex nuts, though in some cases Grade A nuts may be marked with the letter A. ASTM A563 covers standard specifications for carbon and alloy steel nuts. Heavy hex nuts provide increased bearing surface area over finished nuts.

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Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGrade A

Per ASME B18.2.2-2015
Nominal Diameter		UNC	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	1 13/16	1.812	1.756	2.093	2.002	1 7/64	1.139	1.079
1 1/4	1.250	7	2	2.000	1.380	2.309	2.209	1 7/32	1.251	1.187
1 3/8	1.375	6	2 3/16	2.188	2.119	2.526	2.416	1 11/32	1.378	1.310
1 1/2	1.500	6	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	2 9/16	2.562	2.481	2.959	2.828	1 19/32	1.632	1.556
1 3/4	1.750	5	2 3/4	2.750	2.662	3.175	3.035	1 23/32	1.759	1.679
1 7/8	1.875	5	2 15/16	2.938	2.844	3.392	3.242	1 27/32	1.886	1.802
2	2.000	4 1/2	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	3 1/2	3.500	3.388	4.041	3.862	2 13/64	2.251	2.155
2 1/2	2.500	4	3 7/8	3.875	3.750	4.474	4.275	2 29/64	2.505	2.401
2 3/4	2.750	4	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647
3	3.000	4	4 5/8	4.625	4.475	5.340	5.102	2 61/64	3.013	2.893
3 1/4	3.250	4	5	5.000	4.838	5.774	5.515	3 3/16	3.252	3.124
3 1/2	3.500	4	5 3/8	5.375	5.200	6.207	5.928	3 7/16	3.506	3.370
3 3/4	3.750	4	5 3/4	5.750	5.562	5.562	6.341	3 11/16	3.670	3.616
4	4.000	4	6 1/8	6.125	5.925	5.925	6.755	3 15/16	4.014	3.862

All dimensions are in inches.

Grade A 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

NH2B0250000

In Stock

$0.04186/EA

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1/4-20 A563 GRADE A HEAVY HEX NUT

$0.04186/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04186/ EA
870	$0.0392/ EA
3450	$0.03495/ EA
15520	$0.02303/ EA

5/16

9/16

0.2969

NH2B0310000

In Stock

$0.14324/EA

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5/16-18 A563 GRADE A HEAVY HEX NUT

$0.14324/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.14324/ EA
590	$0.13419/ EA
2330	$0.1195/ EA
10470	$0.07919/ EA

3/8

11/16

0.3594

NH2B0370000

In Stock

$0.158/EA

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3/8-16 A563 GRADE A HEAVY HEX NUT

$0.158/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.158/ EA
320	$0.14835/ EA
1280	$0.13265/ EA
5740	$0.08783/ EA

1/2

7/8

0.4844

NH2B0500000

In Stock

$0.2025/EA

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1/2-13 A563 GRADE A HEAVY HEX NUT

$0.2025/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.2025/ EA
160	$0.19009/ EA
620	$0.16852/ EA
2760	$0.11354/ EA

9/16

15/16

0.5469

NH2B0560000

In Stock

$0.65595/EA

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9/16-12 A563 GRADE A HEAVY HEX NUT

$0.65595/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.65595/ EA
130	$0.61575/ EA
500	$0.54589/ EA
2210	$0.36781/ EA

5/8

1 1/16

0.6094

NH2B0620000

In Stock

$0.50961/EA

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5/8-11 A563 GRADE A HEAVY HEX NUT

$0.50961/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.50961/ EA
90	$0.47876/ EA
340	$0.42375/ EA
1520	$0.28788/ EA

3/4

1 1/4

0.7344

NH2B0750000

In Stock

$0.72953/EA

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3/4-10 A563 GRADE A HEAVY HEX NUT

$0.72953/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.72953/ EA
60	$0.68583/ EA
210	$0.60651/ EA
940	$0.41442/ EA

7/8

1 7/16

0.8594

NH2B0870000

In Stock

$1.6695/EA

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7/8-9 A563 GRADE A HEAVY HEX NUT

$1.6695/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.6695/ EA
40	$1.57048/ EA
140	$1.3874/ EA
610	$0.95502/ EA

1 5/8

0.9844

NH2B1000000

In Stock

$1.42611/EA

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1-8 A563 GRADE A HEAVY HEX NUT

$1.42611/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.42611/ EA
25	$1.34255/ EA
100	$1.18506/ EA
500	$0.81981/ EA

1 1/8

1 13/16

1.1094

NH2B1120000

In Stock

$3.088/EA

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1 1/8-7 A563 GRADE A HEAVY HEX NUT

$3.088/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.088/ EA
25	$2.91004/ EA
70	$2.56773/ EA
500	$1.7921/ EA

1 1/4

1.2188

NH2B1250000

In Stock

$2.60823/EA

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1 1/4-7 A563 GRADE A HEAVY HEX NUT

$2.60823/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.60823/ EA
25	$2.45792/ EA
60	$2.16879/ EA
500	$1.51367/ EA

1 3/8

2 3/16

1.3438

NH2B1370000

In Stock

$2.95297/EA

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1 3/8-6 A563 GRADE A HEAVY HEX NUT

$2.95297/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.95297/ EA
40	$2.78578/ EA
80	$2.45627/ EA
180	$1.72815/ EA

1 1/2

2 3/8

1.4688

NH2B1500000

3-5 Working Days

$5.34354/EA

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1 1/2-6 A563 GRADE A HEAVY HEX NUT

$5.34354/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$5.34354/ EA
40	$5.04102/ EA
70	$4.44474/ EA
140	$3.12718/ EA

1 5/8

5.5000

2 9/16

1.5938

NH2B1620000

In Stock

$3.75082/EA

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1 5/8-5.5 A563 GRADE A HEAVY HEX NUT

$3.75082/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.75082/ EA
30	$3.53846/ EA
50	$3.11991/ EA
120	$2.19508/ EA

1 3/4

2 3/4

1.7188

NH2B1750000

In Stock

$9.94876/EA

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1 3/4-5 A563 GRADE A HEAVY HEX NUT

$9.94876/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.94876/ EA
20	$9.38551/ EA
40	$8.27534/ EA
90	$5.82228/ EA

3 1/8

1.9688

NH2B2000000

In Stock

$18.54494/EA

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2-4.5 A563 GRADE A HEAVY HEX NUT

$18.54494/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$18.54494/ EA
20	$17.49502/ EA
30	$15.42561/ EA
70	$10.85299/ EA

2 1/4

4.5000

3 1/2

2.2031

NH2B2250000

In Stock

$22.74625/EA

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2 1/4-4.5 A563 GRADE A HEAVY HEX NUT

$22.74625/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$22.74625/ EA
10	$21.45846/ EA
20	$18.92024/ EA
50	$13.3117/ EA

2 1/2

3 7/8

2.4531

NH2B2500000

In Stock

$54.19113/EA

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2 1/2-4 A563 GRADE A HEAVY HEX NUT

$54.19113/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$54.19113/ EA
10	$51.12308/ EA
20	$45.07596/ EA
40	$31.71407/ EA

2 3/4

4 1/4

2.7031

NH2B2750000

In Stock

$35.60828/EA

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2 3/4-4 A563 GRADE A HEAVY HEX NUT

$35.60828/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$35.60828/ EA
10	$33.59231/ EA
20	$29.61883/ EA
40	$20.8389/ EA

4 5/8

2.9531

NH2B3000000

In Stock

$50.27723/EA

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3-4 A563 GRADE A HEAVY HEX NUT

$50.27723/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$50.27723/ EA
10	$47.43077/ EA
20	$41.8204/ EA
40	$29.42355/ EA

3 1/4

3.1875

NH2B3250000

30-50 Working Days

$49.16014/EA

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3 1/4-4 A563 GRADE A HEAVY HEX NUT

$49.16014/EA

Qty

30-50 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$49.16014/ EA
10	$46.37692/ EA
20	$40.89121/ EA
40	$28.7698/ EA

3 1/2

5 3/8

3.6875

NH2B3750000

In Stock

$162.54077/EA

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3 3/4-4 A563 GRADE A HEAVY HEX NUT

$162.54077/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$162.54077/ EA
10	$153.33846/ EA
20	$135.20076/ EA
40	$95.12312/ EA

6 1/8

3.9375

NH2B4000000

In Stock

$195.54795/EA

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4-4 A563 GRADE A HEAVY HEX NUT

$195.54795/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$195.54795/ EA
10	$184.47692/ EA
20	$162.656/ EA
40	$114.43978/ EA

4 1/4

6 1/2

4.2681

NH2B425NC

30-50 Working Days

$464.21839/EA

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4 1/4-4 A563 GRADE A HEAVY HEX NUT

$464.21839/EA

Qty

30-50 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$464.21839/ EA
10	$437.89086/ EA
20	$386.05405/ EA
40	$271.92081/ EA

4 1/2

6 7/8

4.5220

NH2B450NC

In Stock

$448.39129/EA

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4 1/2-4 A563 GRADE A HEAVY HEX NUT

$448.39129/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$448.39129/ EA
10	$422.96137/ EA
20	$372.89189/ EA
40	$262.64991/ EA

5 1/2

8 3/8

5.5378

NH2B550NC

In Stock

$579.24927/EA

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5 1/2-4 A563 GRADE A HEAVY HEX NUT

$579.24927/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$579.24927/ EA
10	$546.39792/ EA
20	$481.71622/ EA
40	$339.30135/ EA

5 3/4

8 3/4

5.6248

NH2B575NC

In Stock

$763.88157/EA

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5 3/4-4 A563 GRADE A HEAVY HEX NUT

$763.88157/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$763.88157/ EA
10	$720.55904/ EA
20	$635.26043/ EA
40	$447.45167/ EA

9 1/8

6.0457

NH2B600NC

In Stock

$787.24407/EA

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6-4 A563 GRADE A HEAVY HEX NUT

$787.24407/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$787.24407/ EA
10	$742.59657/ EA
20	$654.68919/ EA
40	$461.13649/ EA

ASTM A563	Covers the chemical and mechanical requirements for eight grades of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
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 & Alloy Steel		Per ASTM A563-2015
Diameter	Proof Load Stress (1)		Core Hardness
	ksi		Rockwell
	Non-Zinc-Coated (2)	Zinc-Coated (2)	Min	Max
1/4" thru 4"	100	75	B68	C32

Per ASTM A563-2015
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur
Grade	Material	% by weight	% by weight	% by weight	% by weight
A	Carbon & Alloy Steel	0.55 max	-	0.12	0.15 (1)