Grade Designation

Nominal size of Product inch

Material and Treatment

Mechanical Requirements

Grade Identification Marking

Proof Load Stress ksi

Yield Strength ksi Min.

Tensile Strength ksi Min.

Product, Hardness, Rockwell

Surface Max.

Core

Min.

Max.

A307 Gr. A

1/4 to 4

low or medium carbon steel

-

-

60

-

B69

B100

None Specified

A307 Gr. B

1/4 to 4

-

-

60 min
100 max

-

B69

B95

SAE Gr. 1

1/4 to 1 1/2

33

36

60

-

B70

B100

SAE Gr. 2

1/4 to 3/4

low or medium carbon steel cold worked

55

57

74

-

B80

B100

None Specified

SAE Gr. 5

1/4 to 1

medium carbon steel; the product is quenched and tempered

85

82

120

30N54

C25

C34

1 1/8 to 1 1/2

74

81

105

30N50

C19

C30

A449 Type 1

1/4 to 1

85

92

120

-

C25

C34

1 1/8 to 1 1/2

74

81

105

-

C19

C30

1 3/4 to 3

55

58

90

-

B91

B100

A325 Type 1

1/2 to 1

85

95

120

-

C24

C35

A325

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

A354 Gr. BD

1/4 to 2 1/2

120

130

150

-

C33

C39

2 3/4 to 4

105

115

140

-

C31

C38

Socket Screws

#0 to 1/2

low alloy steel; quenched and tempered

-

162

180

-

-

-

None Specified

5/8 to 2

-

153

170

-

-

-