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ASME B18.31.2:2014 Fully Threaded Inch Series Stud

ASME B18.31.2:2014 Fully Threaded Inch Series Stud is intended for flange bolting and demanding fastening applications within inch-based systems. Its full-thread configuration allows nuts to be installed on both ends to generate secure clamping force for piping, valve, and pressure-equipment joints.

This stud is suitable for petrochemical, energy, machinery, and engineering installation projects, especially where flange compression, gasket retention, and repeat maintenance are required. The standardized inch series supports compatibility with matching flanges, nuts, and washer systems.

Material grades and coating options can be selected according to media exposure, temperature conditions, and corrosion requirements, helping improve reliability during long-term operation.

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Dimensions unit: inch

Thread size d

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

7/8

1

1-1/8

1-1/4

1-3/8

d

0.25

0.3125

0.375

0.4375

0.5

0.5625

0.625

0.75

0.875

1

1.125

1.25

1.375

PP

UNC

20

18

16

14

13

12

11

10

9

8

7

7

6

UNF

28

24

24

20

20

18

18

16

14

12

12

12

12

8UN

-

-

-

-

-

-

-

-

-

-

8

8

8

U

Coarse teeth  UNC

Min.

0.05

0.056

0.063

0.072

0.077

0.084

0.091

0.1

0.111

0.125

0.143

0.143

0.167

Max.

0.1

0.111

0.125

0.143

0.154

0.167

0.182

0.2

0.222

0.25

0.286

0.286

0.333

Fine Teeth UNF

Min.

0.036

0.042

0.042

0.05

0.05

0.056

0.056

0.063

0.072

0.084

0.084

0.084

0.084

Max.

0.071

0.083

0.083

0.1

0.1

0.111

0.111

0.125

0.143

0.167

0.167

0.167

0.167

8UN

Min.

-

-

-

-

-

-

-

-

-

-

0.125

0.125

0.125

Max.

-

-

-

-

-

-

-

-

-

-

0.25

0.25

0.25

  

Thread size d

1-1/2

1-5/8

1-3/4

1-7/8

2

2-1/4

2-1/2

2-3/4

3

3-1/4

3-1/2

3-3/4

4

d

1.5

1.625

1.75

1.875

2

2.25

2.5

2.75

3

3.25

3.5

3.75

4

PP

UNC

6

-

5

-

4 1/2

4 1/2

4

4

4

4

4

4

4

UNF

12

-

-

-

-

-

-

-

-

-

-

-

-

8UN

8

8

8

8

8

8

8

8

8

8

8

8

8

U

Coarse teeth  UNC

Min.

0.167

-

0.2

-

0.222

0.222

0.25

0.25

0.25

0.25

0.25

0.25

0.25

Max.

0.333

-

0.4

-

0.444

0.444

0.5

0.5

0.5

0.5

0.5

0.5

0.5

Fine Teeth UNF

Min.

0.084

-

-

-

-

-

-

-

-

-

-

-

-

Max.

0.167

-

-

-

-

-

-

-

-

-

-

-

-

8UN

Min.

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

0.125

Max.

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

0.25

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