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                Square and Hex Machine Screw Nuts    ANSI/ASME B18.6.3 1972

 

Nominal Size

Width Across Flats(F)

Width Across Corners(G)

Thickness(H)

Square

Hex

Basic

Max

Min

Max

Min

Max

Min

Max

Min

#0

5/32

.156

.150

.221

.206

.180

.171

.050

.043

#1

5/32

.156

.150

.221

.206

.180

.171

.050

.043

#2

3/16

.188

.180

.265

.247

.217

.205

.066

.057

#3

3/16

.188

.180

.265

.247

.217

.205

.066

.057

#4

1/4

.250

.241

.354

.331

.289

.275

.098

.087

#5

5/16

.312

.302

.442

.415

.361

.344

.114

.102

#6

5/16

.312

.302

.442

.415

.361

.344

.114

.102

#8

11/32

.344

.332

.486

.456

.397

.378

.130

.117

#10

3/8

.375

.362

.530

.497

.433

.413

.130

.117

#12

7/16

.438

.423

.619

.581

.505

.482

.161

.148

1/4

7/16

.438

.423

.619

.581

.505

.482

.193

.178

5/16

9/16

.562

.545

.795

.748

.650

.621

.225

.208

3/8

5/8

.625

.607

.884

.833

.722

.692

.257

.239

 

 

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