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ASTM A563 Specification

nutThe ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners. Find below the grades under this specification , marking requirements,Chemical and mechanical Properties

 

 

Nut 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

 

Chemical Properties

Element Grades O, A, B, C D** DH**
Carbon 0.55% max 0.55% max 0.20 - 0.55%
Manganese, min 0.30% 0.60%
Phosphorus, max 0.12% 0.04% 0.04%
Sulfur, max 0.15%* 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

 

Element Classes for Grade C3* DH3
A B C D E F N
Carbon 0.33 - 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%
Manganese 0.90 - 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
Phosphorus 0.040% max 0.06 - 0.12% 0.035% max 0.040% max 0.040% max 0.040% max 0.07 - 0.15% 0.046% max
Sulfur, max 0.050% 0.050% 0.040% 0.050% 0.040% 0.040% 0.050% 0.050%
Silicon 0.15 - 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%
Copper 0.25 - 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
Nickel 0.25 - 0.45% 0.50 - 0.80% 0.25 - 0.50% 0.50 - 0.80% 0.30 - 0.60% 0.20 - 0.40% 1.00% max 0.20% min**
Chromium 0.45 - 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
Vanadium 0.020% min
Molybdenum 0.06% max 0.10% max 0.15% min**
Titanium 0.05% max
* Selection of a class shall be at the option of the manufacturer
** Nickel or Molybdenum may be used.

 

Markings & Grade Idenficiation for ASTM A563 Nuts

Grade Identification Marking Specification Material Nominal Size, In. Proof Load Stress, ksi Hardness Rockwell See Note
Min Max
No Mark
Blank
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 - 1 120 B69 C32 2,3
>1 - 1-1/2 105
ASTM A563 - Grade C ASTM A563 Grade C Carbon Steel, may be Quenched and Tempered 1/4 - 4 144 B78 C38 4
ASTM A563 - Grade C3 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 ASTM A563 Grade D Carbon Steel, may be Quenched and Tempered 1/4 - 4 150 B84 C38 5
ASTM A563 - Grade DH ASTM A563 Grade DH Carbon Steel, Quenched and Tempered 1/4 - 4 175 C24 C38 5
ASTM A563 - Grade DH3 ASTM A563 Grade DH3 Atmospheric Corrosion Resistant Steel, Quenched and Tempered 1/4 - 4 175 C24 C38 4,6

 

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