Nominal Size or Diameter

Body Diameter(E)

Width Across Flats(F)

Width Across Corners(G)

               Height(H)

Wrench

-ing          Height

Thread Length For Screw Lengths(L(1))

Transi-tion Thread Length

6 in. and <

> 6

in.

Max

Min

Basic

Max

Min

Max

Min

Basic

Max

Min

Min.

Basic

Basic

Max

1/4      .2500

.2500

.2450

7/16

.438

.428

.505

.488

5/32

.163

.150

.106

.750

1.000

.250

5/16   .3125

.3125

.3065

1/2

.500

.489

.577

.557

13/64

.211

.195

.140

.875

1.125

.278

3/8      .3750

.3750

.3690

9/16

.562

.551

.650

.628

15/64

.243

.226

.160

1.000

1.250

.312

7/16   .4375

.4375

.4305

5/8

.625

.612

.722

.698

9/32

.291

.272

.195

1.125

1.375

.357

1/2      .5000

.5000

.4930

3/4

.750

.736

.866

.840

5/16

.323

.302

.215

1.250

1.500

.385

9/16   .5625

.5625

.5545

13/16

.812

.798

.938

.910

23/64

.371

.348

.250

1.375

1.625

.417

5/8      .6250

.6250

.6170

15/16

.938

.922

1.083

1.051

25/64

.403

.378

.269

1.500

1.750

.455

3/4     .7500

.7500

.7410

1-1/8

1.125

1.100

1.299

1.254

15/32

.483

.455

.324

1.750

2.000

.500

7/8      .8750

.8750

.8660

1-5/16

1.312

1.285

1.516

1.465

35/64

.563

.531

.378

2.000

2.250

.556

1        1.000

1.000

.9900

1-1/2

1.500

1.469

1.732

1.675

39/64

.627

.591

.416

2.250

2.500

.625

1-1/8   1.125

1.125

1.114

1-11/16

1.688

1.631

1.949

1.859

11/16

.718

.658

.461

2.500

2.750

.714

1-1/4  1.250

1.25

1.239

1-7/8

1.875

1.812

2.165

2.066

25/32

.813

.749

.530

2.750

3.000

.714