Fastener Bolt Thread Stress Tensile Area Table Chart

ANSI Hardware Design Guide and Data

Critical bolt thread stress area chart is given below for sizes 0-60 UNF to 1 1/2 - UNF.

Related resources:

Size

COARSE SERIES - UNC

FINE SERIES - UNF

Size Designation

Nominal Major Diameter, in

Threads per Inch, N

Tensile Stress Area, At
in2

Minor-Diameter Area, Ar
in2

Threads per Inch, N

Tensile Stress Area, At
in2

Minor-Diameter Area, Ar
in2

0

0.0600

-

-

-

80

0.001

0.001

1

0.0730

64

0.002

0.002

72

0.002

0.002

2

0.0860

56

0.003

0.003

64

0.003

0.003

3

0.0990

48

0.004

0.004

56

0.005

0.004

4

0.1120

40

0.006

0.005

48

0.006

0.005

5

0.1250

40

0.007

0.006

44

0.008

0.007

6

0.1380

32

0.009

0.007

40

0.010

0.008

8

0.1640

32

0.014

0.011

36

0.014

0.012

10

0.1900

24

0.017

0.014

32

0.020

0.017

12

0.2160

24

0.024

0.020

28

0.025

0.022

1/4

0.2500

20

0.031

0.026

28

0.036

0.032

5/16

0.3125

18

0.052

0.045

24

0.058

0.052

3/8

0.3750

16

0.077

0.067

24

0.087

0.080

7/16

0.4375

14

0.106

0.093

20

0.118

0.109

1/2

0.5000

13

0.141

0.125

20

0.159

0.148

9/16

0.5625

12

0.182

0.162

18

0.203

0.189

5/8

0.6250

11

0.226

0.202

18

0.256

0.240

3/4

0.7500

10

0.334

0.302

16

0.373

0.351

7/8

0.8750

9

0.462

0.419

14

0.509

0.480

1

1.0000

8

0.606

0.551

12

0.663

0.625

1 1/4

1.2500

7

0.969

0.890

12

1.073

1.024

1 1/2

1.5000

6

1.405

1.294

12

1.581

1.521

References; Esbach, Shigley, ASTM

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