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ASTM A563

The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners. The charts below address over tapping allowances for hot-dip galvanized nuts, grade marking requirements, and mechanical requirements. For information on suitable nuts for various grades of bolts, visit the Nut Compatibility Chart.

According the A563 specification, “The requirements for any grade of nut may, at the supplier’s option, and with notice to the purchaser, be fulfilled by furnishing nuts of one of the stronger grades specified herein unless such a substitution is barred in the inquiry and purchase order”. This is important because some nut grades are not readily available in certain sizes and finishes. Additionally, the specification allows for the substitution of ASTM A194 grade 2H nuts in lieu of A563 grade DH nuts due to the lack of availability of grade DH nuts in nominal sizes ¾” and larger.

Hot-dip galvanized nuts must be tapped oversize to allow for the added thickness of the zinc on the threads of the externally threaded fastener. These allowances are addressed in the chart below and a more detailed explanation of this issue can be found in the Frequently Asked Questions section of this site.

Various nut styles exist and to some degree are determined by their grade. These styles include hex, heavy hex, square, jam, coupling, and sleeve.

Grades

A

Low carbon steel, hex or heavy hex

B

Low carbon steel, hex or heavy hex

C

Carbon steel, quenched and tempered, heavy hex

D

Carbon steel, quenched and tempered, heavy hex

DH

Carbon steel, quenched and tempered, heavy hex

C3

Weathering steel, quenched and tempered, heavy hex

DH3

Weathering steel, quenched and tempered, heavy hex

 

MECHANICAL PROPERTIES

Grade Style Size, in. Proof Load, ksi Hardness, HBN
Black Galvanized
A Hex 1/4 - 1-1/2 90 68 116 - 302
Heavy Hex 2001-4-4 100 75 116 - 302
B Heavy Hex 2001-4-1 133 100 121 - 302
Heavy Hex 1-1/8 - 1-1/2 116 87 121 - 302
C / C3 Heavy Hex 2001-4-4 144 144 143 - 352
D Heavy Hex 2001-4-4 150 150 248 - 352
DH / DH3 Heavy Hex 2001-4-4 175 150 248 - 352
For UNC, 8UN, 6UN, and Coarse Pitch Threads

 

GRADE IDENTIFICATION MARKINGS

 

Grade Identification Marking Specification Material Nominal Size, In. Proof Load Stress, ksi Hardness Rockwell See Note
Min Max

       No Mark

ASTM A563 Grade O Carbon Steel 1/4 - 1-1/2 69 B55 C32 2,3
ASTM A563 Grade A Carbon Steel 1/4 - 1-1/2 90 B68 C32 2,3
ASTM A563 Grade B Carbon Steel 1/4 - 4 120 B69 C32 2,3
>1 - 1-1/2 105
  ASTM A563 Grade C Carbon Steel, may be Quenched and Tempered 1/4 - 4 144 B78 C38 4
  ASTM A563 Grade C3 Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered 1/4 - 4 144 B78 38 4,6
  ASTM A563 Grade D Carbon Steel, may be Quenched and Tempered 1/4 - 4 150 B84 C38 5
  ASTM A563 Grade DH Carbon Steel, Quenched and Tempered 1/4 - 4 175 C24 C38 5
  ASTM A563 Grade DH3 Atmospheric Corrosion Resistant Steel, Quenched and Tempered 1/4 - 4 175 C24 C38 4,6

NOTES:

1. In addition to the indicated grade marking, all grades, except A563 grades O, A, and B, must be marked for manufacturer identification.

2. Nuts are not required to be marked unless specified by the purchaser. When marked,the identification marking shall be the grade letter O, A, or B.

3. Properties shown are those of nonplated or noncoated coarse thread nuts.

4. Properties shown are those of coarse thread heavy hex nuts.

5. Properties shown are those of coarse thread heavy hex nuts. Other nuts style and fine threads may apply.

6. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.

 

 

 

THREAD DIMENSIONS AND OVERSIZING ALLOWANCES

 

for Nuts: Hot Dipped Galvanized per Specification A153, C1.C

Nominal Nut Size, Diametral Allowance, Pitch Diameter
in. and Pitch in. Min Max
0.250 - 20 0.016 0.2335 0.2384
0.312 - 18 0.017 0.2934 0.2987
0.375 - 16 0.017 0.3514 0.3571
0.437 - 14 0.018 0.4091 0.4152
0.500 - 13 0.018 0.468 0.4745
0.0562 - 12 0.02 0.5284 0.5352
0.625 - 11 0.02 0.586 0.5932
0.750 - 10 0.02 0.705 0.7127
0.875 - 9 0.022 0.8248 0.833
1.000 - 8 0.024 0.9428 0.9516
1.125 - 8 0.024 1.0678 1.0768
1.125 - 7 0.024 1.0562 1.0656
1.250 - 8 0.024 1.1928 1.202
1.250 - 7 0.024 1.1812 1.1908
1.375 - 8 0.027 1.3208 1.3301
1.375 - 6 0.027 1.2937 1.3041
1.500 - 8 0.027 1.4458 1.4553
1.500 - 6 0.027 1.4187 1.4292
1.750 - 5 0.05 1.6701 1.6817
2.000 - 4.5 0.05 1.9057 1.9181
2.250 - 4.5 0.05 2.1557 2.1683
2.500 - 4 0.05 2.3876 2.4011
2.750 - 4 0.05 2.6376 2.6513
3.000 - 4 0.05 2.8876 2.9015
3.250 - 4 0.05 3.1376 3.1517
3.500 - 4 0.05 3.3876 3.4019
3.750 - 4 0.05 3.6376 3.6521
4.000 - 4 0.05 3.8876 3.9023

 


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