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MAINTENANCE • MACHINE TOOL SPINDLES

Fractional/Decimal/Metric Equivalents

To convert inches to millimeters, multiply the inches by 25.4. To convert millimeters to inches, divide the millimeters by 25.4. (As established by the American Standards Association.)

fractional

1 16

1 8

3 16

1 4

5 16

3 8

7 16

1 2

1 32

3 32

5 32

7 32

9 32

1132

1332

1532

1 64

3 64

5 64

7 64

9 64

1164

1364

1564

1764

1964

2164

2364

2564

2764

2964

3164

decimal inches

0.0156 0.0312 0.0394

0.0469 0.0625 0.0781 0.0787

0.0938 0.1094 0.1181 0.1250 0.1406 0.1562 0.1575

0.1719 0.1875 0.1969

0.2031 0.2188 0.2344 0.2362

0.2500 0.2656 0.2756

0.2812 0.2969 0.3125 0.3150

0.3281 0.3438 0.3543

0.3594 0.3750 0.3906 0.3937

0.4062 0.4219 0.4331

0.4375 0.4531 0.4688 0.4724 0.4844 0.5000 0.5118

mm

1

2

3

4

5

6

7

8

9

10

11

12

13

fractional

9 16

5 8

1116

3 4

1316

7 8

1516

1

1732

1932

2132

2332

2532

2732

2932

3132

3364

3564

3764

3964

4164

4364

4564

4764

4964

5164

5364

5564

5764

5964

6164

6364

decimal inches

0.5156 0.5312 0.5469 0.5512

0.5625 0.5781 0.5906

0.5938 0.6094 0.6250 0.6299

0.6406 0.6562 0.6693

0.6719 0.6875 0.7031 0.7087 0.7188 0.7344 0.7480

0.7500 0.7656 0.7812 0.7874

0.7969 0.8125 0.8268

0.8281 0.8438 0.8594 0.8661

0.8750 0.8906 0.9055

0.9062 0.9219 0.9375 0.9449

0.9531 0.9688 0.9843

0.9844 1.0000

mm

decimal inches

14

1.0236 1.0630 1.1024 1.1417 1.1811

15

1.2205 1.2598 1.2992 1.3386 1.3780

16

1.4173 1.4567 1.4961 1.5354 1.5748

17

18

1.6142 1.6535 1.6929 1.7323 1.7717

19

1.8110 1.8504 1.8898 1.9291 1.9685

20

21

2.0079 2.0472 2.0866 2.1260 2.1654

22

2.2047 2.2441 2.2835 2.3228 2.3622

23

2.4016 2.4409 2.4803 2.5197 2.5591

24

25

2.5984 2.6378 2.6772 2.7165 2.7559

46

3.5827

91

47

3.6220

92

48

3.6614

93

49

3.7008

94

50

3.7402

95

31

2.9921

76

32

3.0315

77

33

3.0709

78

34

3.1102

79

35

3.1496

80

61

5.1181

130

62

5.3150

135

63

5.5118

140

64

5.7087

145

65

5.9055

150

26

2.7953

71

27

2.8346

72

28

2.8740

73

29

2.9134

74

30

2.9528

75

36

3.1890

81

37

3.2283

82

38

3.2677

83

39

3.3071

84

40

3.3465

85

51

3.7795

96

52

3.8189

97

53

3.8583

98

54

3.8976

99

55

3.9370

100

7.0866

180

7.2835

185

7.4803

190

7.6772

195

7.8740

200

41

3.3858

86

42

3.4252

87

43

3.4646

88

44

3.5039

89

45

3.5433

90

56

4.1339

105

57

4.3307

110

58

4.5276

115

59

4.7244

120

60

4.9213

125

66

6.1024

155

67

6.2992

160

68

6.4691

165

69

6.6929

170

70

6.8898

175

mm

mm

decimal inches

102800

E59

MAINTENANCE MACHINE TOOL SPINDLES

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