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Thread Pitch Chart

Coarse Thread Series - UNC

Fine Thread Series - UNF

8-Thread Series - 8UN

Nominal
Size
and
Threads
Per In.

Basic
Pitch
Dia

Section
at 
Minor
Dia

Tensile
Stress
Area

Nominal
Size
and
Threads
Per In.

Basic
Pitch Dia

Section
at
Minor
Dia

Tensile
Stress
Area 

Nominal
Size
and
Threads
Per In.

Basic
Pitch Dia

Section at Minor Dia

Tensile Stress
Area

In.

sq in.

sq in.

In.

sq in.

sq in.

In.

sq in.

sq in.

--     --

--

--

--

0 - 80

0.0519

0.00151

0.00180

--     --

--

--

--

1 - 64

0.0629

0.00218

0.00263

1 - 72

0.0640

0.00237

0.00278

2 - 56

0.0744

0.00310

0.00370

2 - 64

0.0759

0.00339

0.00394

3 - 48

0.0855

0.00406

0.00487

3 - 56

0.0874

0.00451

0.00523

4 - 40

0.0958 0.1088 0.1177 0.1437

0.00496 0.00672 0.00745 0.01196

0.00604 0.00796 0.00909 0.0140

4 - 48

0.0985 0.1102 0.1218 0.1460

0.00566 0.00716 0.00874 0.01285

0.00661 0.00830 0.01015 0.01474

--     --

--

--

--

5 - 40

5 - 44

6 - 32

6 - 40

8 - 32

8 - 36

10 - 24

0.1629

0.01450

0.0175

10 - 32

0.1697

0.0175

0.0200

--     --

--

--

--

12 - 24

0.1889

0.0206

0.0242

12 - 28

0.1928

0.0226

0.0258

--     --

--

--

--

1/4 - 20

0.2175

0.0269

0.0318

1/4 - 28

0.2268

0.0326

0.0364

--     --

--

--

--

5/16 - 18

0.2764

0.0454

0.0524

5/16 - 24

0.2854

0.0524

0.0580

--     --

--

--

--

3/8 - 16

0.3344

0.0678

0.0775

3/8 - 24

0.3479

0.0809

0.0878

--     --

--

--

--

7/16 - 14

0.3911

0.0933

0.1063

7/16 - 20

0.4050

0.1090

0.1187

--     --

--

--

--

1/2 - 13

0.4500

0.1257

0.1419

1/2 - 20

0.4675

0.1486

0.1599

--     --

--

--

--

9/16 - 12

0.5084

0.162

0.182

9/16 - 18

0.5264

0.189

0.203

--     --

--

--

--

5/8 - 11

0.5660

0.202

0.226

5/8 - 18

0.5889

0.240

0.256

--     --

--

--

--

3/4 - 10

0.6850

0.302

0.334

3/4 - 16

0.7094

0.351

0.373

--     --

--

--

--

7/8 - 9

0.8028

0.419

0.462

7/8 - 14

0.8286

0.180

0.509

--     --

--

--

--

1 - 8

0.9188

0.551

0.606

1 - 12

0.9459

0.625

0.663

1 - 8

0.9188

0.551

0.606

1⅛ - 7

1.0322

0.693

0.763

1⅛ - 12

1.0709

0.812

0.856

1⅛ - 8

1.0438

0.728

0.790

1¼ - 7

1.1572

0.890

0.969

1¼ - 12

1.1959

1.024

1.073

1¼ - 8

1.1688

0.929

1.000

1⅜ - 6

1.2667

1.054

1.155

1⅜ - 12

1.3209

1.260

1.315

1⅜ - 8

1.2938

1.155

1.233

1½ - 6

1.3917

1.294

1.405

1½ - 12

1.4459

1.521

1.581

1½ - 8

1.4188

1.405

4.492

--    --

--

--

--

--    --

--

--

--

1⅝ - 8

1.5438

1.68

1.78

1¾ - 5

1.6201

1.74

1.90

--     --

--

--

--

1¾ - 8

1.6688

1.98

2.08

--    --

--

--

--

--     --

--

--

--

1⅞ - 8

1.7938

2.30

2.41

2 - 4½

1.8557

2.30

2.50

--     --

--

--

--

2 - 8

1.9188

2.65

2.77

2¼ - 4½

2.1057

3.02

3.25

--     --

--

--

--

2¼ - 8

2.1688

3.42

3.56

2½ - 4

2.3376

3.72

4.00

--     --

--

--

--

2½ - 8

2.4188

4.29

4.44

2¾ - 4

2.5876

4.62

4.93

--     --

--

--

--

2¾ - 8

2.6688

5.26

5.43

3 - 4

2.8376

5.62

5.97

--     --

--

--

--

3 - 8

2.9188

6.32

6.51

3¼ - 4

3.0876

6.72

7.10

--     --

--

--

--

3¼ - 8

3.1688

7.49

7.69

3½ - 4

3.3376

7.92

8.33

--     --

--

--

--

3½ - 8

3.4188

8.75

8.96

3¾ - 4

3.5876

9.21

9.66

--     --

--

--

--

3¾ - 8

3.6688

10.11

10.34

4 - 4

3.8376

10.61

11.08

--     --

--

--

--

4 - 8

3.9188

11.57

11.81

 

 


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