Grade
Identification Markings
Grade Identification
MarkingSpecificationMaterialNominal Size, In.Proof Load Stress, ksiHardness
RockwellSee NoteMinMax
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ASTM A563 Grade O |
Carbon Steel |
1/4 - 1-1/2 |
69 |
B55 |
C32 |
2,3 |
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ASTM A563 Grade A |
Carbon Steel |
1/4 - 1-1/2 |
90 |
B68 |
C32 |
2,3 |
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ASTM A563 Grade B |
Carbon Steel |
1/4 - 1 |
120 |
B69 |
C32 |
2,3 |
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>1 - 1-1/2 |
105 |
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ASTM A563 Grade C |
Carbon Steel, may be
Quenched and Tempered |
1/4 - 4 |
144 |
B78 |
C38 |
4 |
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ASTM A563 Grade C3 |
Atmospheric Corrosion
Resistant Steel, may be Quenched and Tempered |
1/4 - 4 |
144 |
B78 |
38 |
4,6 |
