Machinery's Handbook Pocket Companion

WRENCH OPENINGS

Table 17: Wrench Openings for Nuts ANSI/ASME B18.2.2-1987 Appendix

Max. [a] Width Across Flats of Nut

Wrench Opening [b]

Max. [c] Width Across Flats of Nut

Wrench Opening [b]

Max. [d] Width Across Flats of Nut

Wrench Opening [b]

Min.

Max.

Min.

Max.

Min.

Max.

0.158

0.163

1

1.257

1.267

2.954

2.973

0.190

0.195

1.320

1.331

3

3.016

3.035

0.220

0.225

1 ?

1.383

1.394

3 ?

3.142

3.162

0.252

0.257

1.446

1.457

3 ?

3.393

3.414

0.283

0.288

1

1.508

1.520

3

3.518

3.540

0.316

0.322

1 ?

1.634

1.646

3

3.770

3.793

0.347

0.353

1.696

1.708

3 ?

3.895

3.918

?

0.378

0.384

1.822

1.835

4 ?

4.147

4.172

0.440

0.446

1 ?

1.885

1.898

4

4.272

4.297

0.504

0.510

2

2.011

2.025

4

4.524

4.550

0.556

0.573

2.074

2.088

4 ?

4.649

4.676

?

0.629

0.636

2.200

2.215

4 ?

4.900

4.928

0.692

0.699

2

2.262

2.277

5

5.026

5.055

0.755

0.763

22 ?

2.388

2.404

5

5.277

5.307

0.818

0.826

2.450

2.466

5 ?

5.403

5.434

?

0.880

0.888

2.576

2.593

5 ?

5.654

5.686

0.944

0.953

2 ?

2.639

2.656

5

5.780

5.813

1

1.006

1.015

2

2.766

2.783

6

6.031

6.157

1.068

1.077

2.827

2.845

6 ?

6.065

6.192

1 ?

1.132

1.142

All dimensions given in inches.

[a]Wrenches are marked with the "Nominal Size of Wrench," which is equal to the basic or maximum width across flats...

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