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    Scope

    ASTM A563 is the standard specification for carbon and alloy steel nuts of various grades in sizes from 1/4 inch to 4 inches for general structural and mechanical applications on bolts, studs and other externally threaded components. A563 nuts from Glaser and Associates are available in seven grades, A, B, C, C3, D, DH and DH3, offering different mechanical and chemical properties for specific applications. ASTM A563 also covers the American Association State Highway and Transportation Officials Standard AASHTO M-291.

    These nuts are designed, manufactured and tested to comply with the standards set by ASTM A563 for hardness, proof load and chemical and mechanical properties.

    Grades

     

    Grade

    Material

    Type

    A

    Carbon steel

    Hex or heavy hex

    B

    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

    The properties tables below provide more information on the differences between the grades.

    Applications

    ASTM A563 nuts from Glaser and Associates provide secure fastening in general structural and mechanical applications on bolts, studs, and other externally threaded components. Nuts in grades DH3 and C3 have corrosion resistance and weathering characteristics that is substantially better than that of carbon steel with or without copper addition. Grade DH3 and C3 nuts can be used uncoated in many applications that are exposed to the atmosphere.

    Properties

     

    Grade

    Type

    Size

    Proof Load, ksi

    Hardness, HBN

    Black

    Galvanized

    A

    Hex

    1/4 - 1-1/2 inches

    90

    68

    116 - 302

    Heavy hex

    1/4 – 4 inches

    100

    75

    116 - 302

    B

    Heavy hex

    1/4 – 1 inch

    133

    100

    121 - 302

    Heavy hex

    1-1/8 - 1-1/2 inches

    116

    87

    121 - 302

    C / C3

    Heavy hex

    1/4 – 4 inches

    144

    144

    143 - 352

    D

    Heavy hex

    1/4 – 4 inches

    150

    150

    248 - 352

    DH / DH3

    Heavy hex

    1/4 – 4 inches

    175

    150

    248 - 352

     

    Element

    Grades A, B, C

    Grade D

    Grade 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%

     

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