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Bolt - Hex Heavy, ANSI (in)

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  • ASME Standards

    • ASME B18.2.1

  • Length (L) of a heavy hex bolt is measured from underside of head to the end of the bolt.

Nut

Nut

Bolt

Size

Body Diameter

D

Width Across Flat

A

Width Across Corner

B

Thickness

C

Max

Min

Basic

Max

Min

Max

Min

Basic

Max

Min

1/2

0.515

0.482

7/8

0.875

0.850

1.010

0.969

11/32

0.364

0.302

5/8

0.642

0.605

1 1/16

1.062

1.031

1.227

1.175

27/64

0.444

0.378

3/4

0.768

0.729

1 1/4

1.250

1.212

1.443

1.383

1/2

0.524

0.455

7/8

0.895

0.852

1 7/16

1.438

1.394

1.660

1.589

37/64

0.604

0.531

1

1.022

0.976

1 5/8

1.625

1.575

1.876

1.796

43/64

0.700

0.591

1 1/8

1.149

1.098

1 13/16

1.812

1.756

2.093

2.002

3/4

0.780

0.658

1 1/4

1.277

1.223

2

2.000

1.938

2.309

2.209

27/32

0.876

0.749

1 3/8

1.404

1.345

2 3/16

2.188

2.119

2.526

2.416

29/32

0.940

0.810

1 1/2

1.531

1.470

2 3/8

2.375

2.300

2.742

2.622

1

1.036

0.902

1 3/4

1.785

1.716

2 3/4

2.750

2.662

3.175

3.035

1 5/32

1.196

1.054

2

2.039

1.964

3 1/8

3.125

3.025

3.608

3.449

1 11/32

1.388

1.175

2 1/4

2.305

2.214

3 1/2

3.500

3.388

4.041

3.862

1 1/2

1.548

1.327

2 1/2

2.559

2.461

3 7/8

3.875

3.750

4.474

4.275

1 21/32

1.708

1.479

2 3/4

2.827

2.711

4 1/4

4.250

4.112

4.907

4.688

1 13/16

1.869

1.632

3

3.081

2.961

4 5/8

4.625

4.475

5.340

5.102

2

2.060

1.815

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