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General Information, Facts & Tables
[Letter / Number Drill Dimensions]

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Overview

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These tables list the dimensions of the twist drills referred to by number (1 - 80) or letter (A - Z).

See Also: Inch - mm Table.
 

Number Drills

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Number

Diameter (mm)

Diameter (decimal Inch)

1

5.7912

0.2280

2

5.6134

0.2210

3

5.4102

0.2130

4

5.3086

0.2090

5

5.2197

0.2055

6

5.1816

0.2040

7

5.1054

0.2010

8

5.0546

0.1990

9

4.9784

0.1960

10

4.9149

0.1935

11

4.8514

0.1910

12

4.8006

0.1890

13

4.6990

0.1850

14

4.6228

0.1820

15

4.5720

0.1800

16

4.4958

0.1770

17

4.3942

0.1730

18

4.3053

0.1695

19

4.2164

0.1660

20

4.0894

0.1610

21

4.0386

0.1590

22

3.9878

0.1570

23

3.9116

0.1540

24

3.8608

0.1520

25

3.7973

0.1495

26

3.7338

0.1470

27

3.6576

0.1440

28

3.5687

0.1405

29

3.4544

0.1360

30

3.2639

0.1285

31

3.0480

0.1200

32

2.9464

0.1160

33

2.8702

0.1130

34

2.8194

0.1110

35

2.7940

0.1100

36

2.7051

0.1065

37

2.6416

0.1040

38

2.5781

0.1015

39

2.5273

0.0995

40

2.4892

0.0980

41

2.4384

0.0960

42

2.3749

0.0935

43

2.2606

0.0890

44

2.1844

0.0860

45

2.0828

0.0820

46

2.0574

0.0810

47

1.9939

0.0785

48

1.9304

0.0760

49

1.8542

0.0730

50

1.7780

0.0700

51

1.7018

0.0670

52

1.6129

0.0635

53

1.5227

0.0600

54

1.3970

0.0550

55

1.3208

0.0520

56

1.1811

0.0465

57

1.0922

0.0430

58

1.0668

0.0420

59

1.0414

0.0410

60

1.0160

0.0400

61

0.9906

0.0390

62

0.9652

0.0380

63

0.9398

0.0370

64

0.9144

0.0360

65

0.8890

0.0350

66

0.8382

0.0330

67

0.8128

0.0320

68

0.7874

0.0310

69

0.7417

0.0292

70

0.7112

0.0280

71

0.6604

0.0260

72

0.6350

0.0250

73

0.6096

0.0240

74

0.5715

0.0225

75

0.5334

0.0210

76

0.5080

0.0200

77

0.4572

0.0180

78

0.4064

0.0160

79

0.3683

0.0145

80

0.3429

0.0135

 

Letter Drills

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Letter

Dia in mm

Dia in Dec Inch

A

5.9436

0.2340

B

6.0452

0.2380

C

6.1468

0.2420

D

6.2484

0.2460

E

6.3500

0.2500

F

6.5278

0.2570

G

6.6294

0.2610

H

6.7564

0.2660

I

6.9088

0.2720

J

7.0358

0.2770

K

7.1374

0.2810

L

7.3660

0.2900

M

7.4930

0.2950

N

7.6708

0.3020

O

8.0264

0.3160

P

8.2042

0.3230

Q

8.4328

0.3320

R

8.6106

0.3390

S

8.8392

0.3480

T

9.0932

0.3580

U

9.3472

0.3680

V

9.5758

0.3770

W

9.8044

0.3860

X

10.0838

0.3970

Y

10.2616

0.4040

Z

10.4902

0.4130