Nom. Pipe Size

Thrds per inch

PIPE O.D.

Pipe I.D. (ANSI Schedule)

Nom. Pipe Size

Tap Drill Sizes

Thread Length

Nom. Pipe Size

N/A THREADED

40

80

120 custom

160

XX

NPT National Pipe Thread for Pressure Sealing

SPT Straight Pipe Thread for Mechanical Connection

Total Inches ext. Thread

Makeup after tightening

5

10

1/8

27

.405

n/a

.307

.269

.215

--

--

--

1/8

21/64

.328

11/32

.344

.392

.291

1/8

1/4

18

.540

n/a

.410

.364

.302

--

--

--

1/4

27/64

.422

7/16

.438

.595

.367

1/4

3/8

18

.675

n/a

.545

.493

.423

--

--

--

3/8

9/16

.563

37/64

.578

.601

.407

3/8

1/2

14

.840

.710

.674

.622

.546

.480

.466

.252

1/2

11/16

.688

23/32

.719

.782

.534

1/2

3/4

14

1.050

.920

.884

.824

.742

.690

.614

.434

3/4

57/64

.891

59/64

.922

.794

.553

3/4

1

11.5

1.315

1.185

1.097

1.049

.957

.891

.815

.599

1

1 1/8

1.125

1 5/32

1.156

.985

.661

1

1 1/4

11.5

1.660

1.530

1.442

1.380

1.278

1.204

1.160

.896

1 1/4

1-15/32

1.469

1 1/2

1.500

1.009

.681

1 1/4

1 1/2

11.5

1.900

1.777

1.682

1.610

1.500

1.423

1.338

1.100

1 1/2

1 23/32

1.719

1 3/4

1.750

1.025

.681

1 1/2

2

11.5

2.375

2.245

2.157

2.067

1.939

1.845

1.689

1.503

2

2 3/16

2.188

2 7/32

2.219

1.058

.697

2

2 1/2

8

2.875

2.709

2.635

2.469

2.323

2.239

2.125

1.771

2 1/2

2 19/32

2.594

2 21/32

2.656

1.571

.932

2 1/2

3

8

3.500

3.334

3.260

3.068

2.900

2.758

2.624

2.300

3

3 1/4

3.250

3 5/16

3.31

1.634

1.016

3

3 1/2

8

4.000

3.834

3.760

3.548

3.364

--

--

2.728

3 1/2

3 3/4

3.750

3 13/16

3.81

1.684

1.071

3 1/2

4

8

4.500

4.334

4.260

4.026

3.826

3.624

3.438

3.152

4

4 1/4

4.250

4 5/16

4.31

1.734

1.094

4

5

8

5.563

5.345

5.295

5.047

4.813

4.563

4.313

4.603

5

5 5/16

5.315

5 3/8

5.375

1.840

1.187

5

6

8

6.625

6.407

6.357

6.065

5.761

5.501

5.189

4.897

6

6 3/8

6.375

6 7/16

6.437

1.946

1.208

6

8

8

8.625

8.407

8.329

7.981

7.625

7.189

6.813

6.875

8

--

--

--

--

2.146

1.313

8

150 # Flange ( 0.062" face thickness)

Nominal Pipe Size

O.D.

Thick *

O.D. of Raised

Face

Diam. of Bolt

Circle

Weight Blind

LBS

1

4.25

.56

2.00

3.12

2

1 1/4

4.62

.62

2.50

3.50

3

1 1/2

5.00

.69

2.87

3.87

3

2

6.00

.75

3.62

4.75

4

2 1/2

7.00

.87

4.12

5.50

7

3

7.50

.94

5.00

6.00

9

3 1/2

8.5

.94

5.50

7.00

13

4

9.00

.94

6.19

7.50

17

5

10.00

.94

7.31

8.50

20

6

11.00

1.00

8.50

9.50

27

8

13.50

1.13

10.62

11.75

47

300 # Flange ( 0.062" face thickness)

Nominal Pipe Size

O.D.

Thick *

O.D. of Raised

Face

Diam. of Bolt

Circle

Weight Blind

LBS

1

4.87

0.69

2.00

3.50

4

1 1/4

5.25

0.75

2.50

3.87

6

1 1/2

6.12

0.81

2.87

4.50

7

2

6.50

0.87

3.62

5.00

8

2 1/2

7.50

1.00

4.12

5.87

12

3

8.25

1.12

5.00

6.62

16

3 1/2

9.00

1.19

5.50

7.25

21

4

10.00

1.25

6.19

7.87

28

5

11.00

1.38

7.31

9.25

37

6

12.50

1.44

8.50

10.62

48

8

15.00

1.62

10.63

13.00

79