Programming of CNC Machines, Third Edition

Appendix

CHART 1: ENGLISH DRILL SIZES

DRILL/DECIMAL

Drill/ Decimal

Drill/Decimal

Drill/ Decimal

80

.0135

40

.0980

2

.2210

33/64

.5156

79

.0145

39

.0995

1

.2280

17/32

.5312

1/64

.0156

38

.1015

A

.2340

35/64

.5469

78

.0160

37

.1040

15/64

.2344

9/16

.5625

77

.0180

36

.1065

B

.2380

37/64

.5781

76

.0200

7/64

.1094

C

.2420

19/32

.5938

75

.0210

35

.1100

D

.2460

39/64

.6094

74

.0225

34

.1110

E

.2500

5/8

.6250

73

.0240

33

.1130

1/4

.2500

41/64

.6406

72

.0250

32

.1160

F

.2570

21/32

.6562

71

.0260

31

.1200

G

.2610

43/64

.6719

70

.0280

1/8

.1250

17/64

.2656

11/16

.6875

69

.0292

30

.1285

H

.2660

45/64

.7031

68

.0310

29

.1360

I

.2720

23/32

.7188

1/32

.0312

28

.1405

J

.2770

47/64

.7344

67

.0320

9/64

.1406

K

.2810

3/4

.7500

66

.0330

27

.1440

9/32

.2812

49/64

.7656

65

.0350

26

.1470

L

.2900

25/32

.7812

64

.0360

25

.1495

M

.2950

51/64

.7969

63

.0370

24

.1520

19/64

.2969

13/16

.8125

62

.0380

23

.1540

N

.3020

53/64

.8281

61

.0390

5/32

.1562

5/16

.3125

27/32

.8438

60

.0400

22

.1570

O

.3160

55/64

.8594

59

.0410

21

.1590

P

.3230

7/8

.8750

58

.0420

20

.1610

21/64

.3281

57/64

.8906

57

.0430

19

.1660

Q

.3320

29/32

.9062

56

.0465

18

.1695

R

.3390

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