Grade Identification Markings
Grade Identification MarkingSpecificationMaterialNominal Size, In.Proof Load Stress, ksiHardness RockwellSee NoteMinMax
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 - 1
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, |
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