Drill Size

Decimal   (in)

Conv. Metric (mm)

1/32"

0.0313

0.80

1/16"

0.0625

1.59

5/64"

0.0781

1.98

3/32"

0.0937

2.38

7/64"

0.1093

2.78

1/8"

0.1250

3.18

9/64"

0.1406

3.57

5/32"

0.1562

3.97

11/64"

0.1719

4.37

3/16"

0.1875

4.76

13/64"

0.2031

5.16

7/32"

0.2187

5.55

15/64"

0.2340

5.94

1/4"

0.2500

6.35

17/64"

0.2656

6.75

9/32"

0.2812

7.14

19/64"

0.2968

7.54

5/16"

0.3125

7.94

21/64"

0.3281

8.33

11/32"

0.3437

8.73

23/64"

0.3594

9.13

3/8"

0.3750

9.53

25/64"

0.3906

9.92

13/32"

0.4062

10.32

27/64"

0.4219

10.72

7/16"

0.4375

11.11

29/64"

0.4531

11.51

15/32"

0.4687

11.90

31/64"

0.4844

12.30

1/2"

0.5000

12.70

33/64"

0.5156

13.10

9/16"

0.5625

14.29

37/64"

0.5781

14.68

19/32"

0.5937

15.08

39/64"

0.6094

15.48

5/8"

0.6250

15.88

41/64"

0.6406

16.27

21/32"

0.6562

16.67

43/64"

0.6719

17.07

11/16"

0.6875

17.46

45/64"

0.7031

17.86

23/32"

0.7187

18.25

47/64"

0.7344

18.65

3/4"

0.7500

19.05

49/64"

0.7656

19.45

25/32"

0.7812

19.84

51/64"

0.7969

20.24

13/16"

0.8125

20.64

53/64"

0.8281

21.03

27/32"

0.8437

21.43

55/64"

0.8594

21.83

7/8"

0.8750

22.23

57/64"

0.8906

22.62

29/32"

0.9062

23.02

59/64"

0.9219

23.42

15/16"

0.9375

23.81

61/64"

0.9531

24.21

31/32"

0.9687

24.60

63/64"

0.9844

25.00

1

1.0000

25.40