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ASTM A563

ASTM A563 Hex Nut Grade O,A,B, C,D.

astm-a563-

ASTM A563 Grades

ACarbon steel, hex or heavy hex
BCarbon steel, hex or heavy hex
CCarbon steel, quenched and tempered, heavy hex
DCarbon steel, quenched and tempered, heavy hex
DHCarbon steel, quenched and tempered, heavy hex
C3Weathering steel, quenched and tempered, heavy hex
DH3Weathering steel, quenched and tempered, heavy hex

ASTM A563 Mechanical Properties

GradeStyleSize, in.Proof Load, ksiHardness, HBN
PlainGalvanized
AHex1/4 – 1-1/29068116 – 302
Heavy Hex1/4 – 410075116 – 302
BHeavy Hex1/4 – 1133100121 – 302
Heavy Hex1-1/8 – 1-1/211687121 – 302
C / C3Heavy Hex1/4 – 4144144143 – 352
DHeavy Hex1/4 – 4150150248 – 352
DH / DH3Heavy Hex1/4 – 4175150248 – 352
For UNC, 8UN, 6UN, and Coarse Pitch Threads

ASTM A563 Chemical Properties

ElementGrades O, A, B, CD**DH**
Carbon0.55% max0.55% max0.20 – 0.55%
Manganese, min0.30%0.60%
Phosphorus, max0.12%0.04%0.04%
Sulfur, max0.15%*0.05%0.05%
* For grades O, A and B a sulfur content of 0.23% max is acceptable with the purchasers approval
** For grades D and DH a sulfur content of 0.05 – 0.15% is acceptable provided the manganese is 1.35% min
ElementClasses for Grade C3*DH3
ABCDEFN
Carbon0.33 – 0.40%0.38 – 0.48%0.15 – 0.25%0.15 – 0.25%0.20 – 0.25%0.20 – 0.25%0.20 – 0.53%
Manganese0.90 – 1.20%0.70 – 0.90%0.80 – 1.35%0.40 – 1.20%0.60 – 1.00%0.90 – 1.20%0.40% min
Phosphorus0.040% max0.06 – 0.12%0.035% max0.040% max0.040% max0.040% max0.07 – 0.15%0.046% max
Sulfur, max0.050%0.050%0.040%0.050%0.040%0.040%0.050%0.050%
Silicon0.15 – 0.35%0.30 – 0.50%0.15 – 0.35%0.25 – 0.50%0.15 – 0.35%0.15 – 0.35%0.20 – 0.90%
Copper0.25 – 0.45%0.20 – 0.40%0.20 – 0.50%0.30 – 0.50%0.30 – 0.60%0.20 – 0.40%0.25 – 0.55%0.20% min
Nickel0.25 – 0.45%0.50 – 0.80%0.25 – 0.50%0.50 – 0.80%0.30 – 0.60%0.20 – 0.40%1.00% max0.20% min**
Chromium0.45 – 0.65%0.50 – 0.75%0.30 – 0.50%0.50 – 1.00%0.60 – 0.90%0.45 – 0.65%0.30 – 1.25%0.45% min
Vanadium0.020% min
Molybdenum0.06% max0.10% max0.15% min**
Titanium0.05% max
* Selection of a class shall be at the option of the manufacturer
** Nickel or Molybdenum may be used.

ASTM A563 Grade Identification Markings

Grade Identification MarkingSpecificationMaterialNominal Size, In.Proof Load Stress, ksiHardness RockwellSee Note
MinMax
astma563ASTM A563 Grade OCarbon Steel1/4 – 1-1/269B55C322,3
ASTM A563 Grade ACarbon Steel1/4 – 1-1/290B68C322,3
ASTM A563 Grade BCarbon Steel1/4 – 1120B69C322,3
>1 – 1-1/2105
astma563-1ASTM A563 Grade CCarbon Steel, may be Quenched and Tempered1/4 – 4144B78C384
astma563-2ASTM A563 Grade C3Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered1/4 – 4144B78384,6
astm-A563-3ASTM A563 Grade DCarbon Steel, may be Quenched and Tempered1/4 – 4150B84C385
astm-A563-4ASTM A563 Grade DHCarbon Steel, Quenched and Tempered1/4 – 4175C24C385
astm-A563-5ASTM A563 Grade DH3Atmospheric Corrosion Resistant Steel, Quenched and Tempered1/4 – 4175C24C384,6
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 styles 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.

Inch Fastener Standards. 7th ed. Cleveland: Industrial Fasteners Institute, 2003. n-80-n-81.

Thread Dimensions and Oversizing Allowances

For Nuts: Hot Dipped Galvanized per Specification F2329

Nominal Nut Size, in. and PitchDiametral Allowance, in.Pitch Diameter
MinMax
0.250 – 200.0160.23350.2384
0.312 – 180.0170.29340.2987
0.375 – 160.0170.35140.3571
0.437 – 140.0180.40910.4152
0.500 – 130.0180.46800.4745
0.562 – 120.0200.52840.5352
0.625 – 110.0200.58600.5932
0.750 – 100.0200.70500.7127
0.875 – 90.0220.82480.8330
1.000 – 80.0240.94280.9516
1.125 – 80.0241.06781.0768
1.125 – 70.0241.05621.0656
1.250 – 80.0241.19281.2020
1.250 – 70.0241.18121.1908
1.375 – 80.0271.32081.3301
1.375 – 60.0271.29371.3041
1.500 – 80.0271.44581.4553
1.500 – 60.0271.41871.4292
1.750 – 50.0501.67011.6817
2.000 – 4.50.0501.90571.9181
2.250 – 4.50.0502.15572.1683
2.500 – 40.0502.38762.4011
2.750 – 40.0502.63762.6513
3.000 – 40.0502.88762.9015
3.250 – 40.0503.13763.1517
3.500 – 40.0503.38763.4019
3.750 – 40.0503.63763.6521
4.000 – 40.0503.88763.9023

The ASTM A563 determination covers the synthetic and mechanical prerequisites for carbon and compound steel nuts utilized on screws, studs, and remotely Threaded Fasteners. The diagrams beneath address over tapping remittances for hot-plunge aroused nuts, grade stamping prerequisites, and mechanical necessities. For data on reasonable nuts for different grades of fasteners.

As indicated by the A563 determination, “The prerequisites for any grade of nut may, at the provider’s choice, and with notice to the buyer, be satisfied by outfitting nuts of one of the more grounded grades determined thus except if such a replacement is banished in the request and buy request”. This is significant on the grounds that some nut grades are not promptly accessible in specific sizes and wraps up. Furthermore, the determination considers the replacement of ASTM A194 grade 2H nuts in lieu of A563 grade DH nuts because of the absence of accessibility of grade DH nuts in ostensible sizes 3/4″ and bigger.