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Drill bit sizes

DRILL BIT SIZES

DRILL BIT SIZES

FRACTION SIZE

# SIZE

LETTER SIZE

METRIC SIZE

DECIMAL INCHES

 

80

   

0.0135

 

79

   

0.0145

1/64

     

0.0156

 

78

   

0.0160

 

77

   

0.0180

     

0.50

0.0197

 

76

   

0.0200

 

75

   

0.0210

 

74

   

0.0225

 

73

   

0.0240

 

72

   

0.0250

 

71

   

0.0260

 

70

   

0.0280

 

69

   

0.0292

     

0.75

0.0295

 

68

   

0.0310

1/32

     

0.0312

 

67

   

0.0320

 

66

   

0.0330

 

65

   

0.0350

 

64

   

0.0360

 

63

   

0.0370

 

62

   

0.0380

 

61

   

0.0390

     

1.00

0.0394

 

60

   

0.0400

 

59

   

0.0410

 

58

   

0.0420

 

57

   

0.0430

 

56

   

0.0465

3/64

     

0.0469

     

1.25

0.0492

 

55

   

0.0520

 

54

   

0.0550

     

1.50

0.0591

 

53

   

0.0595

1/16

     

0.0625

 

52

   

0.0635

 

51

   

0.0670

     

1.75

0.0689

 

50

   

0.0700

 

49

   

0.0730

 

48

   

0.0760

5/64

     

0.0781

 

47

   

0.0785

     

2.00

0.0787

 

46

   

0.0810

 

45

   

0.0820

 

44

   

0.0860

     

2.25

0.0886

 

43

   

0.0890

 

42

   

0.0935

3/32

     

0.0938

 

41

   

0.0960

 

40

   

0.0980

     

2.50

0.0984

 

39

   

0.0995

 

38

   

0.1015

 

37

   

0.1040

 

36

   

0.1065

     

2.75

0.1083

7/64

     

0.1094

 

35

   

0.1100

 

34

   

0.1110

 

33

   

0.1130

 

32

   

0.1160

     

3.00

0.1181

 

31

   

0.1200

1/8

     

0.1250

     

3.25

0.1280

 

30

   

0.1285

 

29

   

0.1360

     

3.50

0.1378

 

28

   

0.1405

9/64

     

0.1406

 

27

   

0.1440

 

26

   

0.1470

     

3.75

0.1476

 

25

   

0.1495

 

24

   

0.1520

 

23

   

0.1540

5/32

     

0.1562

 

22

   

0.1570

     

4.00

0.1575

 

21

   

0.1590

 

20

   

0.1610

 

19

   

0.1660

     

4.25

0.1673

 

18

   

0.1695

11/64

     

0.1719

 

17

   

0.1730

 

16

   

0.1770

     

4.50

0.1772

 

15

   

0.1800

 

14

   

0.1820

 

13

   

0.1850

     

4.75

0.1870

3/16

     

0.1875

 

12

   

0.1890

 

11

   

0.1910

 

10

   

0.1935

 

9

   

0.1960

     

5.00

0.1969

 

8

   

0.1990

 

7

   

0.2010

13/64

     

0.2031

 

6

   

0.2040

 

5

   

0.2055

     

5.25

0.2067

 

4

   

0.2090

 

3

   

0.2130

     

5.50

0.2165

7/32

     

0.2188

 

2

   

0.2210

     

5.75

0.2264

 

1

   

0.2280

   

A

 

0.2340

15/64

     

0.2344

     

6.00

0.2362

   

B

 

0.2380

   

C

 

0.2420

   

D

 

0.2460

     

6.25

0.2461

1/4

 

E

 

0.2500

     

6.50

0.2559

   

F

 

0.2570

   

G

 

0.2610

17/64

     

0.2656

     

6.75

0.2657

   

H

 

0.2660

   

I

 

0.2720

     

7.00

0.2756

   

J

 

0.2770

   

K

 

0.2810

9/32

     

0.2812

     

7.25

0.2854

   

L

 

0.2900

   

M

 

0.2950

     

7.50

0.2953

19/64

     

0.2969

   

N

 

0.3020

     

7.75

0.3051

5/16

     

0.3125

     

8.00

0.3150

   

O

 

0.3160

   

P

 

0.3230

     

8.25

0.3248

21/64

     

0.3281

   

Q

 

0.3320

     

8.50

0.3346

   

R

 

0.3390

11/32

     

0.3438

     

8.75

0.3445

   

S

 

0.3480

     

9.00

0.3543

   

T

 

0.3580

23/64

     

0.3594

     

9.25

0.3642

   

U

 

0.3680

     

9.50

0.3740

3/8

     

0.3750

   

V

 

0.3770

     

9.75

0.3839

   

W

 

0.3860

25/64

     

0.3906

     

10.00

0.3937

   

X

 

0.3970

   

Y

 

0.4040

13/32

     

0.4063

   

Z

 

0.4130

     

10.50

0.4134

27/64

     

0.4219

     

11.00

0.4331

7/16

     

0.4375

     

11.50

0.4528

29/64

     

0.4531

15/32

     

0.4688

     

12.00

0.4724

31/64

     

0.4844

     

12.50

0.4921

1/2

     

0.5000

     

13.00

0.5118

33/64

     

0.5156

17/32

     

0.5312

     

13.50

0.5315

35/64

     

0.5469

     

14.00

0.5512

9/16

     

0.5625

     

14.50

0.5709

37/64

     

0.5781

     

15.00

0.5906

19/32

     

0.5938

39/64

     

0.6094

     

15.50

0.6102

5/8

     

0.6250

     

16.00

0.6299

41/64

     

0.6406

     

16.50

0.6496

21/32

     

0.6562

     

17.00

0.6693

43/64

     

0.6719

11/16

     

0.6875

     

17.50

0.6890

45/64

     

0.7031

     

18.00

0.7087

23/32

     

0.7188

     

18.50

0.7283

47/64

     

0.7344

     

19.00

0.7480

3/4

     

0.7500

49/64

     

0.7656

     

19.50

0.7677

25/32

     

0.7813

     

20.00

0.7874

 51/64

     

0.7969

     

20.50

0.8071

13/16

     

0.8125

     

21.00

0.8268

53/64

     

0.8281

27/32

     

0.8438

     

21.50

0.8465

55/64

     

0.8594

     

22.00

0.8661

7/8

     

0.8750

     

22.50

0.8858

57/64

     

0.8906

     

23.00

0.9055

29/32

     

0.9062

59/64

     

0.9219

     

23.50

0.9252

15/16

     

0.9375

     

24.00

0.9449

61/64

     

0.9531

     

24.50

0.9646

31/32

     

0.9688

     

25.00

0.9843

63/64

     

0.9844

1

     

1.0000

This page last updated: 16-Apr-2008

Content and Design © 2002-present WanderingTrail,  Ron Seegert
Common Sense and Safety should always be observed when working on your vehicle or doing modifications. Jackstands, wheel blocks, disconnecting the battery are a few of the basic safety precautions that should be used and may not be mentioned in the write ups on this site. You are responsible for your own installation, these write ups are a helpful guideline and should not be taken as an official installation instruction. My write up may be different from the kits currently out there, so alwasy double check the manufacturers installation instructions when installing anything. I try to keep the site up to date with changes that have occured as I discover them, but may not have the latest unless someone lets me know. If you feel that an install is above your capabilities after reading my write ups, I recommend getting together with a club and getting some help. Only a few times have I needed to employe some actual help from a shop to get something done. Usually welding or A/C work.
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