DISCLAIMER

Nominal Size
or Basic Major
Thread Diameter

F

G

H

Width
Across Flats

Width
Across Corners

Thickness

Basic

Max

Min

Max

Min

Basic

Max

Min

1/4

.2500

1/2

.500

.488

.577

.556

15/64

.250

.218

5/16

.3125

9/16

.562

.546

.650

.622

19/64

.314

.280

3/8

.3750

11/16

.688

.669

.794

.763

23/64

.377

.341

7/16

.4375

3/4

.750

.728

.866

.830

27/64

.441

.403

1/2

.5000

7/8

.875

.850

1.010

.969

31/64

.504

.464

9/16

.5625

15/16

.938

.909

1.083

1.037

35/64

.568

.526

5/8

.6250

1-1/16

1.062

1.031

1.227

1.175

39/64

.631

.587

3/4

.7500

1-1/4

1.250

1.212

1.443

1.382

47/64

.758

.710

7/8

.8750

1-7/16

1.438

1.394

1.660

1.589

55/64

.885

.833

1

1.0000

1-5/8

1.325

1.575

1.876

1.796

63/64

1.012

.956

1-1/8

1.1250

1-13/16

1.812

1.756

2.093

2.002

1-7/64

1.139

1.079

1-1/4

1.2500

2

2.000

1.938

2.309

2.209

1-7/32

1.251

1.187

1-3/8

1.3750

2-3/16

2.188

2.119

2.526

2.416

1-11/32

1.378

1.310

1-1/2

1.5000

2-3/8

2.375

2.300

2.742

2.622

1-15/32

1.505

1.433

1-5/8

1.6250

2-9/16

2.562

2.481

2.959

2.828

1-19/32

1.632

1.556

1-3/4

1.7500

2-3/4

2.750

2.662

3.175

3.035

1-23/32

1.759

1.679

2

2.0000

3-1/8

3.125

3.025

3.608

3.449

1-31/32

2.013

1.925

2-1/4

2.2500

3-1/2

3.500

3.388

4.041

3.862

2-13/64

2.251

2.155

2-1/2

2.5000

3-7/8

3.875

3.750

4.474

4.275

2-29/64

2.505

2.401

2-3/4

2.7500

4-1/4

4.250

4.112

4.907

4.688

2-45/64

2.759

2.647

3

3.0000

4-5/8

4.625

4.475

5.340

5.102

2-61/64

3.013

2.893

3-1/4

3.2500

5

5.000

4.838

5.774

5.515

3-3/16

3.252

3.124

3-1/2

3.5000

5-3/8

5.375

5.200

6.207

5.928

3-7/16

3.506

3.370

3-3/4

3.7500

5-3/4

5.750

5.562

6.640

6.341

3-11/16

3.670

3.616

4

4.0000

6-1/8

6.125

5.925

7.073

6.755

3-15/16

4.014

3.862