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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 Item # Availability Price Quantity UOM

5 3/8

NH2B3750000

17 In Stock

$71.81996/EA

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3 3/4-4 A563 Grade A Heavy Hex Nut

$71.81996/EA

Qty

17 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$71.81996/EA
10	$67.75385/EA
20	$59.73956/EA
40	$42.03092/EA

1/4

1/2

NH2B0250000

10509 In Stock

$0.04186/EA

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1/4-20 A563 Grade A Heavy Hex Nut

$0.04186/EA

Qty

10509 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

NH2B0310000

2161 In Stock

$0.1432/EA

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5/16-18 A563 Grade A Heavy Hex Nut

$0.1432/EA

Qty

2161 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.1432/EA
590	$0.13415/EA
2330	$0.11947/EA
10470	$0.07917/EA

3/8

11/16

NH2B0370000

2184 In Stock

$0.13239/EA

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3/8-16 A563 Grade A Heavy Hex Nut

$0.13239/EA

Qty

2184 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.13239/EA
320	$0.12431/EA
1280	$0.11115/EA
5740	$0.07359/EA

1/2

7/8

NH2B0500000

637 In Stock

$0.23379/EA

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1/2-13 A563 Grade A Heavy Hex Nut

$0.23379/EA

Qty

637 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.23379/EA
160	$0.21947/EA
620	$0.19457/EA
2760	$0.13109/EA

9/16

15/16

NH2B0560000

519 In Stock

$0.65284/EA

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9/16-12 A563 Grade A Heavy Hex Nut

$0.65284/EA

Qty

519 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.65284/EA
130	$0.61283/EA
500	$0.5433/EA
2210	$0.36606/EA

5/8

1 1/16

NH2B0620000

911 In Stock

$0.37572/EA

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5/8-11 A563 Grade A Heavy Hex Nut

$0.37572/EA

Qty

911 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37572/EA
90	$0.35297/EA
340	$0.31242/EA
1520	$0.21224/EA

3/4

1 1/4

NH2B0750000

3164 In Stock

$0.65076/EA

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3/4-10 A563 Grade A Heavy Hex Nut

$0.65076/EA

Qty

3164 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.65076/EA
60	$0.61178/EA
210	$0.54102/EA
940	$0.36967/EA

7/8

1 7/16

NH2B0870000

525 In Stock

$0.91311/EA

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7/8-9 A563 Grade A Heavy Hex Nut

$0.91311/EA

Qty

525 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.91311/EA
40	$0.85895/EA
140	$0.75882/EA
610	$0.52233/EA

1 5/8

NH2B1000000

1046 In Stock

$1.25876/EA

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1-8 A563 Grade A Heavy Hex Nut

$1.25876/EA

Qty

1046 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.25876/EA
25	$1.18501/EA
100	$1.046/EA
500	$0.72361/EA

1 1/8

1 13/16

NH2B1120000

120 In Stock

$3.34062/EA

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1 1/8-7 A563 Grade A Heavy Hex Nut

$3.34062/EA

Qty

120 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.34062/EA
25	$3.1481/EA
70	$2.77779/EA
500	$1.93871/EA

1 1/4

NH2B1250000

340 In Stock

$3.02221/EA

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1 1/4-7 A563 Grade A Heavy Hex Nut

$3.02221/EA

Qty

340 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.02221/EA
25	$2.84804/EA
60	$2.51302/EA
500	$1.75392/EA

1 3/8

2 3/16

NH2B1370000

49 In Stock

$4.10727/EA

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1 3/8-6 A563 Grade A Heavy Hex Nut

$4.10727/EA

Qty

49 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.10727/EA
40	$3.87474/EA
80	$3.41641/EA
180	$2.40368/EA

1 1/2

2 3/8

NH2B1500000

95 In Stock

$4.8244/EA

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1 1/2-6 A563 Grade A Heavy Hex Nut

$4.8244/EA

Qty

95 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.8244/EA
40	$4.55126/EA
70	$4.01291/EA
140	$2.82336/EA

1 5/8

5.5

2 9/16

NH2B1620000

14 In Stock

$3.75082/EA

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1 5/8-5.5 A563 Grade A Heavy Hex Nut

$3.75082/EA

Qty

14 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

NH2B1750000

21 In Stock

$9.50982/EA

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1 3/4-5 A563 Grade A Heavy Hex Nut

$9.50982/EA

Qty

21 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.50982/EA
20	$8.97142/EA
40	$7.91023/EA
90	$5.56539/EA

3 1/8

NH2B2000000

15 In Stock

$10.1696/EA

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2-4.5 A563 Grade A Heavy Hex Nut

$10.1696/EA

Qty

15 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$10.1696/EA
20	$9.59385/EA
30	$8.45903/EA
70	$5.95152/EA

2 1/4

4.5

3 1/2

NH2B2250000

19 In Stock

$22.50662/EA

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2 1/4-4.5 A563 Grade A Heavy Hex Nut

$22.50662/EA

Qty

19 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$22.50662/EA
10	$21.2324/EA
20	$18.72092/EA
50	$13.17146/EA

2 1/2

3 7/8

NH2B2500000

9 In Stock

$25.59615/EA

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2 1/2-4 A563 Grade A Heavy Hex Nut

$25.59615/EA

Qty

9 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$25.59615/EA
10	$24.14702/EA
20	$21.29078/EA
40	$14.97954/EA

2 3/4

4 1/4

NH2B2750000

13 In Stock

$34.00571/EA

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2 3/4-4 A563 Grade A Heavy Hex Nut

$34.00571/EA

Qty

13 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$34.00571/EA
10	$32.08046/EA
20	$28.28581/EA
40	$19.90103/EA

4 5/8

NH2B3000000

3-5 Working Days

$43.77691/EA

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3-4 A563 Grade A Heavy Hex Nut

$43.77691/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$43.77691/EA
10	$41.29846/EA
20	$36.41346/EA
40	$25.61939/EA

3 1/4

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

6 1/8

NH2B4000000

30-50 Working Days

$144.06393/EA

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4-4 A563 Grade A Heavy Hex Nut

$144.06393/EA

Qty

30-50 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$144.06393/EA
10	$135.90769/EA
20	$119.8318/EA
40	$84.30998/EA

4 1/4

6 1/2

NH2B425NC

21 In Stock

$258.93032/EA

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4 1/4-4 A563 Grade A Heavy Hex Nut

$258.93032/EA

Qty

21 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$258.93032/EA
10	$244.24543/EA
20	$215.33205/EA
40	$151.67116/EA

4 1/2

6 7/8

NH2B450NC

3 In Stock

$407.9948/EA

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4 1/2-4 A563 Grade A Heavy Hex Nut

$407.9948/EA

Qty

3 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$407.9948/EA
10	$384.85592/EA
20	$339.2973/EA
40	$238.98725/EA

5 1/2

8 3/4

NH2B550NC

4 In Stock

$597.1482/EA

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5 1/2-4 A563 Grade A Heavy Hex Nut

$597.1482/EA

Qty

4 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$597.1482/EA
10	$563.28173/EA
20	$496.60135/EA
40	$349.78584/EA

5 3/4

8 3/4

NH2B575NC

9 In Stock

$570.33546/EA

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5 3/4-4 A563 Grade A Heavy Hex Nut

$570.33546/EA

Qty

9 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$570.33546/EA
10	$537.98964/EA
20	$474.3033/EA
40	$334.07999/EA

9 1/8

NH2B600NC

3 In Stock

$632.74836/EA

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6-4 A563 Grade A Heavy Hex Nut

$632.74836/EA

Qty

3 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$632.74836/EA
10	$596.86288/EA
20	$526.20722/EA
40	$370.63901/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)