ASTM A563 for Nuts

Specification Nominal Size (inches) Material
ASTM A563 Grade O 1/4 - 1-1/2 Carbon Steel
ASTM A563 Grade A 1/4 - 1-1/2 Carbon Steel
ASTM A563 Grade B 1/4 - 1 Carbon Steel
1 - 1-1/2
ASTM A563 Grade C 1/4 - 4 Carbon Steel, may be Quenched and Tempered
ASTM A563 Grade C3 1/4 - 4 Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered
ASTM A563 Grade D 1/4 - 4 Carbon Steel, may be Quenched and Tempered
ASTM A563 Grade DH 1/4 - 4 Carbon Steel, Quenched and Tempered
ASTM A563 Grade DH3 1/4 - 4 Atmospheric Corrosion Resistant Steel, Quenched and Tempered

For more information, see www.astm.org.