Machine Screw Size

Number of Threads Per Inch

Minor Dia.

Tap Drills

Clearance Hole Drills

Aluminum, Brass & Plastics

75% Thread 

Stainless Steel, Steels & Iron

50% Thread

All Materials

Close Fit

Free Fit

No. or Dia.

Major Dia.

Drill Size

Decimal Equiv.

Drill Size

Decimal Equiv.

Drill Size

Decimal Equiv.

Drill Size

Decimal Equiv.

0

.0600

80

.0447

3/64

.0469

55

.0520

52

.0635

50

.0700

1

.0730

64

.0538

53

.0595

1/16

.0625

48

.0760

46

.0810

72

.0560

53

.0595

52

.0635

2

.0860

56

.0641

50

.0700

49

.0730

43

.0890

41

.0960

64

.0668

50

.0700

48

.0760

3

.0990

48

.0734

47

.0785

44

.0860

37

.1040

35

.1100

56

.0771

45

.0820

43

.0890

4

.1120

40

.0813

43

.0890

41

.0960

32

.1160

30

.1285

48

.0864

42

.0935

40

.0980

5

.1250

40

.0943

38

.1015

7/64

.1094

30

.1285

29

.1360

44

.0971

37

.1040

35

.1100

6

.1380

32

.0997

36

.1065

32

.1160

27

.1440

25

.1495

40

.1073

33

.1130

31

.1200