Nominal
Size

F

C

H

Weight
Per Nut

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

0.03

1/2

7/8

0.875

0.850

1.010

0.969

31/64

0.504

0.464

0.07

5/8

1-1/16

1.062

1.031

1.227

1.175

39/64

0.631

0.587

0.12

3/4

1-1/4

1.250

1.212

1.443

1.382

47/64

0.758

0.710

0.20

7/8

1-7/16

1.438

1.394

1.660

1.589

55/64

0.885

0.833

0.30

1

1-5/8

1.625

1.575

1.876

1.796

63/64

1.012

0.956

0.43

1-1/8

1-13/16

1.812

1.756

2.093

2.002

1-7/64

1.139

1.079

0.59

1-1/4

2

2.000

1.938

2.309

2.209

1-7/32

1.251

1.187

0.79

1-3/8

2-3/16

2.188

2.119

2.526

2.416

1-11/32

1.378

1.310

1.02

1-1/2

2-3/8

2.375

2.300

2.742

2.622

1-15/32

1.505

1.433

1.31

1-5/8

2-9/16

2.562

2.481

2.959

2.828

1-19/32

1.632

1.556

1.62

1-3/4

2-3/4

2.750

2.662

3.175

3.035

1-23/32

1.759

1.679

2.04

1-7/8

2-15/16

2.938

2.844

3.392

3.242

1-27/32

1.886

1.802

2.41

2

3-1/8

3.125

3.025

3.608

3.449

1-31/32

2.013

1.925

2.99

2-1/4

3-1/2

3.500

3.388

4.041

3.862

2-13/64

2.251

2.155

4.19

2-1/2

3-7/8

3.875

3.750

4.474

4.275

2-29/64

2.505

2.401

5.64

2-3/4

4-1/4

4.250

4.112

4.907

4.688

2-45/64

2.759

2.647

7.38

3

4-5/8

4.625

4.475

5.340

5.102

2-61/64

3.013

2.893

9.50

3-1/4

5

5.000

4.838

5.774

5.515

3-3/16

3.252

3.124

11.94

3-1/2

5-3/8

5.375

5.200

6.207

5.928

3-7/16

3.506

3.370

15.26

3-3/4

5-3/4

5.750

5.562

6.640

6.341

3-11/16

3.760

3.616

18.12

4

6-1/8

6.125

5.925

7.073

6.755

3-15/16

4.014

3.862

21.80

STOCK

Diameters:
Finish:
Grades:

3/8?? upto 4??
Black , Hot Dip Galvanized and Zinc.
A194 grade 2H /2HM/Grade-4/Grade-7 and A563 grades A, C, and DH
 

APPLICATION

Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts.  There are numerous grades of heavy hex nuts and the heavy pattern is typically used for large diameter and high strength bolts.   Since hot dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts

Note

Ningbo Dongxin can supply the Metric Size Hvy Hex Nuts also.