The following table gives the thickness of the bolt-heads and the widths of hexagon nuts in the Whitworth standard. The third, fifth, and seventh columns are to the nearest sixty-fourth of an inch: -

Diameter of Bolt and

Thickness of Nut in In.

Thickness of Head in In.

Width of Nut across Flats in In.

Width of Nut across Corners in In.

1/2

•4375

7/16

•9191

59/64

1.06

1 1/16

3/16

• 4921

31/64

1.011

1 1/64

1.16

15/32

5/8

•5468

35/64

l.101

1 7/64

1.27

1 17/64

11/16

.6015

19/32

1.2011

1 13/64

1 .38

1 3/8

3/4

.6562

21/32

1.3012

1 19/64

15

1 1/2

13/16

.7109

45/644

1.39

1 25/64

1.6

1 39/64

7/8

•7656

49/64

1.4788

1 31/64

1.7

1 45/64

1 5/16

•8203

1/1 5/6

1.5745

1 37/64

1.82

1 33/64

1

•875

7/88

1.6701

1 43/64

1.95

1 33/64

1 1/8

.9843

6/6 3/4

1.8605

1 55/64

2.15

2 5/64

1 1/4

1.0937

1 3/33

2.0483

2 3/64

2.36

2 23/64

1 3/4

1.2031

1 13/64

2.2146

2 7/32

2.55

2 35/64

1 1/2

1.3125

1 5/16

2.4131

2 13/32

278

2 23/32

1 5/8

1.421

1 27/64

2.5763

2 37/64

2.97

2 31/32

1 3/4

1.5312

1 17/32

2.7578

2 3/4

3.18

3 3/16

1 5/4

1..6406

1 31/64

3.0183

3 1/64

3.48

3 31/64

2

1.75

1 3/4

3.1492

35/32

363

3 5/8

The odd 1/16 -in. sizes given above are seldom used.