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Mathematics

By Muhammed Iqbal Hussain (editors)
From Machinery's Handbook, 27th Edition

NUMBERS, FRACTIONS, AND DECIMALS

Table 1: Fractional and Decimal Inch to Millimeter, Exact [a] Values

Fractional Inch

Decimal Inch

Millimeters

Fractional Inch

Decimal Inch

Millimeters

1/64

0.015625

0.396875

0.511811024

13

1/32

0.03125

0.79375

33/64

0.515625

13.096875

0.039370079

1

17/32

0.53125

13.49375

3/64

0.046875

1.190625

35/64

0.546875

13.890625

1/16

0.0625

1.5875

0.551181102

14

5/64

0.078125

1.984375

9/16

0.5625

14.2875

0.078740157

2

37/64

0.578125

14.684375

1/12

0.08 33 [b]

2.11 66

7/12

0.58 33

14.81 66

3/32

0.09375

2.38125

0.590551181

15

7/64

0.109375

2.778125

19/32

0.59375

15.08125

0.118110236

3

39/64

0.609375

15.478125

1/8

0.125

3.175

5/8

0.625

15.875

9/64

0.140625

3.571875

0.62992126

16

5/32

0.15625

3.96875

41/64

0.640625

16.271875

0.157480315

4

21/32

0.65625

16.66875

1/6

0.1 66

4.2 33

2/3

0. 66

16.9 33

11/64

0.171875

4.365625

0.669291339

17

3/16

0.1875

4.7625

43/64

0.671875

17.065625

0.196850394

5

11/16

0.6875

17.4625

13/64

0.203125

5.159375

45/64

0.703125

17.859375

7/32

0.21875

5.55625

0.708661417

18

15/64

0.234375

5.953125

23/32

0.71875

18.25625

0.236220472

6

47/64

0.734375

18.653125

1/4

0.25

6.35

0.748031496

19

17/64

0.265625

6.746875

3/4

0.75

19.05

0.275590551

7

49/64

0.765625

19.446875

9/32

0.28125

7.14375

25/32

0.78125

19.84375

19/64

0.296875

7.540625

0.787401575

20

5/16

0.3125

7.9375

51/64

0.796875

20.240625

0.31496063

8

13/16

0.8125

20.6375

21/64

0.328125

8.334375

0.826771654

21

1/3

0. 33

8.4 66

53/64

0.828125

21.034375

11/32

0.34375

8.73125

27/32

0.84375

21.43125

0.354330709

9

55/64

0.859375

21.828125

23/64

0.359375

9.128125

0.866141732

22

3/8

0.375

9.525
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Products & Services
V-ribbed Pulleys
V-ribbed pulleys or sheaves have a series of V-shaped ribs that mate with V-ribbed belts. They are used in numerous power transmission applications.
V-Belt Pulleys
V-belt pulleys or sheaves mate with drive belts in numerous power transmission applications. They are made in many configurations such as tension idlers and variable speed / ratio pulleys.
Hose Fittings
Hose fittings are a category of components used to connect hoses and tubes for in-line, offset, multi-port, and mounting configurations.
Pneumatic Fittings
Pneumatic fittings are parts used to connect sections of pipe, tube, and hose in pneumatic (pressurized gas) lines and systems.
Tube Fittings
Tube fittings connect runs of tubing for in-line, offset, multi-port, and mounting configurations to other tubing sections, pipe, hose, and other fluid transfer components.
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