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Grade Designation

Nominal Size of Product in. Material and Treatment

Mechanical Requirements

Grade Identification MarkingProof

Load Stress ksi

Yield Strength ksi Min

Tensile Strength ksi Min

Product, Hardness, Rockwell

Surface Max

Core

Min Max

ASTM A307 Gr. A

1/4 to 4

low or medium carbon steel

–– –– 60 –– B69 B100 307A

ASTM A307 Gr. B 1/4 to 4 –– –– 60 min 100

max –– B69 B95 307B

SAE Gr. 1 1/4 to 1-1/2 33 36 60 –– B70 B100 None specified

SAE Gr. 2 1/4 to 3/4 low of medium carbon steel, cold worked 55 57 74 –– B80 B100 None specified

SAE Gr. 5 1/4 to 1 1-1/8 to

1-1/2

medium carbon steel; the product is quenched

and tempered

8574

9281

120105

30N54 30N50

C25C19

C34C30

ASTM A449 Type 1

1/4 to 1 1-1/8

to 1-1/2 1-3/4 to 3

85 74 55

928158

12010590

––C25C19B91

C34C30

B100

ASTM A325 Type 1

1/2 to 1 1-1/8 to

1-1/2

8574

9281

120105 –– C24

C19C35C31 A325

SAE Gr. 5.2 1/4 to 1 low carbon boron steel; the product is quenched

and tempered

85 92 120 30N56 C26 C36

ASTM A449 Type 2 1/4 to 1 85 92 120 –– C25 C34

ASTM A325 Type 3

1/2 to 1 atmospheric corrosion resistant steel;

the product is quenched and tempered

85 92 120 –– C24 C35A325

1-1/8 to 1-1/2 74 81 105 –– C19 C31

SAE Gr. 8 1/4 to 1-1/2

medium carbon alloy steel; the product is quenched

and tempered

120 130 150 30N58.6 C33 C39

ASTM A354 Gr. BD

1/4 to 2-1/2 120 130 150 –– C33 C39BD

2-3/4 to 4 105 115 140 –– C31 C38

ASTM A490 Type 1 1/2 to 1-1/2 120 130 150 min

170 max –– C33 C38 A490

SAE Gr. 8.2 1/4 to 1low carbon boron steel; the product is quenched

and tempered120 130 150 30N58.6 C33 C39

ASTM A490 Type 3 1/2 to 1-1/2

atmospheric corrosion resistant steel; the product is quenched and tempered

120 130 150 min 170 max –– C33 C38 A490

ASTM A5740.060 to 1/2 fine grain alloy steel

product is quenched and tempered

140 –– 180 –– C39 C45None Specified

Over 1/2 135 –– 170 –– C37 CC45

Grade Markings For Steel Bolts & Screws

Information presented is for general reference and informational purposes only. Information presented is believed to be accurate at the time of document creation. However Global Industrial is not responsible for any claim traceable to any errors (typo or otherwise) as contained herein. Global Industrial makes no warranties as to the accuracy of this information found in public circulation.

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