Basic Dimensions of American Standard Taper Pipe Threads

Taper Pipe Threads

For all dimensions see corresponding reference letters in table. Angle between sides of thread is 60 degrees. Taper of thread on diameter is ¾ inches per foot. Angle of taper with centerline is 1° 47’ 24” (1.7899°). The basic maximum thread height, h of the truncated thread is 0.8 x (pitch of thread). The crest and root are truncated a minimum of 0.033 x (pitch) for all pitches.

Nominal Pipe Size

Outside Diameter of Pipe,
D

Threads per Inch,
n

Pitch of Thread,
P

Pitch Dia, at Beginning of External Thread,
E0

Handtight Engagement

Length",
L1

Diameter,
E1

Handtight Engagement

Length",
L2

Diameter,
E2

1/16

0.3125

27

0.03704

0.27118

0.160

0.28118

0.2611

0.28750

1/8

0.405

27

0.03704

0.36351

0.1615

0.37360

0.2639

0.38000

1/4

0.540

18

0.05556

0.47739

0.2278

0.49163

0.4018

0.50250

3/8

0.675

18

0.05556

0.61201

0.240

0.62701

0.4078

0.63750

1/2

0.840

14

0.07143

0.75843

0.320

0.77843

0.5337

0.79179

3/4

1.050

14

0.07143

0.96768

0.339

0.98887

0.5457

1.00179

1

1.315

11.5

0.08696

1.21363

0.400

1.23863

0.6828

1.25630

1-1/4

1.660

11.5

0.08696

1.55713

0.420

1.58338

0.7068

1.60130

1-1/2

1.900

11.5

0.08696

1.79609

0.420

1.82234

0.7235

1.84130

2

2.375

11.5

0.08696

2.26902

0.436

2.29627

0.7565

2.31630

2-1/2

2.875

8

0.12500

2.71953

0.682

2.76216

1.1375

2.79062

3

3.5

8

0.12500

3.34062

0.766

3.38850

1.2000

3.41562

3-1/2

4

8

0.12500

3.83750

0.821

3.88881

1.2500

3.91562

4

4.5

8

0.12500

4.33438

0.844

4.38712

1.3000

4.41562

5

5.563

8

0.12500

5.39073

0.937

5.44929

1.4063

5.47862

6

6.625

8

0.12500

6.44609

0.958

6.50597

1.5125

6.54062

8

8.625

8

0.12500

8.43359

1.063

8.50003

1.7125

8.54062

10

10.750

8

0.12500

10.54531

1.210

10.62094

1.9250

10.66562

12

12.750

8

0.12500

12.53281

1.360

12.61781

2.1250

12.66562

 

H1: Dimensions of American Standard Pipe Sizes

Nominal Size

Schedule Number

Outside Diameter

Inside Diameter

Wall Thickness

Inside Area

Weight Per Ft.

Metal Area

1/8

40

0.405

0.269

0.068

0.057

0.245

0.072

80

0.405

0.215

0.095

0.036

0.315

0.093

1/4

40

0.540

0.364

0.088

0.104

0.425

0.125

80

0.540

0.302

0.119

0.072

0.535

0.157

3/8

40

0.675

0.493

0.091

0.191

0.568

0.167

80

0.675

0.423

0.126

0.141

0.739

0.217

1/2

40

0.840

0.622

0.109

0.304

0.851

0.250

80

0.840

0.546

0.147

0.234

1.088

0.320

3/4

40

1.050

0.824

0.113

0.533

1.131

0.333

80

1.050

0.742

0.154

0.432

1.474

0.433

1

40

1.315

1.049

0.133

0.864

1.679

0.494

80

1.315

0.957

0.179

0.719

2.172

0.639

1-1/4

40

1.660

1.380

0.140

1.496

2.273

0.668

80

1.660

1.278

0.191

1.283

2.996

0.881

1-1/2

40

1.900

1.610

0.145

2.036

2.718

0.799

80

1.900

1.500

0.200

1.767

3.631

1.068

2

40

2.375

2.067

0.154

3.356

3.653

1.074

80

2.375

1.939

0.218

2.953

5.022

1.477

2-1/2

40

2.875

2.469

0.203

4.788

5.792

1.704

80

2.875

2.323

0.276

4.238

7.660

2.253

3

40

3.500

3.068

0.216

7.393

7.575

2.228

80

3.500

2.900

0.300

6.605

10.252

3.016

3-1/2

40

4.000

3.548

0.226

9.887

9.108

2.679

80

4.000

3.364

0.318

8.888

12.504

3.678

4

40

4.500

4.026

0.237

12.730

10.789

3.174

80

4.500

3.826

0.337

11.497

14.982

4.407

5

40

5.563

5.047

0.258

20.006

14.615

4.299

80

5.563

4.813

0.375

18.194

20.776

6.111

6

40

6.625

6.065

0.280

28.890

18.971

5.580

80

6.625

5.761

0.432

26.607

28.570

8.404

8

40

8.625

7.981

0.322

50.027

28.548

8.397

80

8.625

7.625

0.500

45.664

43.382

12.761

10

40

10.750

10.020

0.365

78.854

40.474

11.905

80

10.750

9.750

0.500

74.662

54.726

16.098

12

40

12.750

11.938

0.406

111.932

53.512

15.741

80

12.750

11.750

0.500

108.434

65.402

19.238

 

Thread forms of Various Pipe Threads

American Standard Taper Pipe

Pipe Thread Forms

British Standard Taper Pipe

British Standard Taper Pipe

Custom Applications or Technical Questions – Oster is here for you!

When you call Oster Manufacturing there is always a human being on the other end of the line. We have skilled technical and sales experts on hand to take your call. If you’re interested in a machine or tooling for a non-standard threading application we are happy to consult with you on the project and come up with custom engineered solutions to make your project idea a reality. We can make a variety of custom tooling for special projects and keep them in stock for you so you never have to wait when it comes to a difficult project.

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