Nuts > Heavy Hex Nuts (ASTM A563)


Heavy Hex Nuts (ASTM A563)

Heavy Hex Nuts (ASTM A563)

Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

Hot Dip Galvanized nuts will be tapped oversize prior to coating to allow for the thickness of the bolts coating. 


DETAILS


 

Nominal Size

Width Across Flats 

Width Across Corners

Thickness

Basic

Max

Min

Max

Min

Basic

Max

Min

  3/8

 11/16

0.688

0.669

0.794

0.763

23/64

0.377

0.341

  1/2

  7/8

0.875

0.85

1.01

0.969

31/64

0.504

0.464

  5/8

1  1/16

1.062

1.031

1.227

1.175

39/64

0.631

0.587

  3/4

1  1/4

1.25

1.212

1.443

1.382

47/64

0.758

0.71

  7/8

1  7/16

1.438

1.394

1.66

1.589

55/64

0.885

0.833

1     

1  5/8

1.625

1.575

1.876

1.796

63/64

1.012

0.956

1  1/8

1 13/16

1.812

1.756

2.093

2.002

1  7/64

1.139

1.079

1  1/4

2     

2

1.938

2.309

2.209

1  7/32

1.251

1.187

1  3/8

2  3/16

2.188

2.119

2.526

2.416

1 11/32

1.378

1.31

1  1/2

2  3/8

2.375

2.3

2.742

2.622

1 15/32

1.505

1.433

1  5/8

2  9/16

2.562

2.481

2.959

2.828

1 19/32

1.632

1.556

1  3/4

2  3/4

2.75

2.662

3.175

3.035

1 23/32

1.759

1.679

1  7/8

2 15/16

2.938

2.844

3.392

3.242

1 27/32

1.886

1.802

2     

3  1/8

3.125

3.025

3.608

3.449

2     

2.013

1.925

2  1/4

3  1/2

3.5

3.388

4.041

3.862

2 13/64

2.251

2.155

2  1/2

3  7/8

3.875

3.75

4.474

4.275

2 29/64

2.505

2.401

2  3/4

4  1/4

4.25

4.112

4.907

4.688

2 45/64

2.759

2.647

3     

4  5/8

4.625

4.475

5.34

5.102

2 61/64

3.013

2.893

3  1/4

5     

5

4.838

5.774

5.515

3  3/16

3.252

3.124

3  1/2

5  3/8

5.375

5.2

6.207

5.928

3  7/16

3.506

3.37

3  3/4

5  3/4

5.75

5.562

6.64

6.341

3 11/16

3.76

3.616

4     

6  1/8

6.125

5.925

7.073

6.755

3 15/16

4.014

3.862

 

 

 

 

 

 

 

 

 

Dimensions per ASME B18.2.2 1987 (1999)

Downloadable Files
a563 nut compatibilty.xls