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Machine Screw
Size

Threads
Per Inch

Minor
Dia

Tap Drills

Clearance Hole Drills

Alum, Brass,
& Plasitcs

75% Thread

Stainless Steel,
Steels & Iron

50% Thread

All Materials

Close Fit

Free Fit

# 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

.125

40

.0943

38

.1015

7/64

.1094

30

.1285

29

.1360

44

.0971

37

.1040

35

.1100

6

.138

32

.0997

36

.1065

32

.1160

27

.1440

25

.1495

40

.1073

33

.1130

31

.1200

8

.1640

32

.1257

29

.1360

27

.1440

18

.1695

16

.1770

36

.1299

29

.1360

26

.1470

10

.1900

24

.1389

25

.1495

20

.1610

9

.1960

7

.2010

32

.1517

21

.1590

18

.1695

12

.2160

24

.1649

16

.1770

12

.1890

2

.2210

1

.2280

28

.1722

14

.1820

10

.1935

32

.1777

13

.1850

9

.1960

1/4

.2500

20

.1887

7

.2010

7/32

.2188

F

.2570

H

.2660

28

.2062

3

.2130

1

.2280

32

.2117

7/32

.2188

1

.2280

5/16

.3125

18

.2443

F

.2570

J

.2770

P

.3230

Q

.3320

24

.2614

I

.2720

9/32

.2812

32

.2742

9/32

.2812

L

.2900

3/8

.3750

16

.2983

5/16

.3125

Q

.3320

W

.3860

X

.3970

24

.3239

Q

.3320

S

.3480

32

.3367

11/32

.3438

T

.3580

7/16

.4375

14

.3499

U

.3680

25/64

.3906

29/64

.4531

15/32

.4687

20

.3762

25/64

.3906

13/32

.4062

28

.3937

Y

.4040

Z

.4130

1/2

.5000

13

.4056

27/64

.4219

29/64

.4531

33/64

.5156

17/32

.5312

20

.4387

29/64

.4531

15/32

.4688

28

.4562

15/32

.4688

15/32

.4688

9/16

.5625

12

.4603

31/64

.4844

33/64

.5156

37/64

.5781

19/32

.5938

18

.4943

33/64

.5156

17/32

.5312

24

.5114

33/64

.5156

17/32

.5312

5/8

.6250

11

.5135

17/32

.5312

9/16

.5625

41/64

.6406

21/32

.6562

18

.5568

37/64

.5781

19/32

.5938

24

.5739

37/64

.5781

19/32

.5938

11/16

.6875

24

.6364

41/64

.6406

21/32

.6562

45/64

.7031

23/32

.6562

3/4

.7500

10

.6273

21/32

.6562

11/16

.6875

49/64

.7656

25/32

.7812

16

.6733

11/16

.6875

45/64

.7031

20

.6887

45/64

.7031

23/32

.7188

13/16

.8125

20

.7512

49/64

.7656

25/32

.7812

53/64

.8281

27/32

.8438

7/8

.8750

9

.7387

49/64

.7656

51/64

.7969

57/64

.8906

29/32

.9062

14

.7874

13/16

.8125

53/64

.8281

20

.8137

53/64

.8281

27/32

.8438

15/16

.9375

20

.8762

57/64

.8906

29/32

.9062

61/64

.9531

31/32

.9688

1

1.000

8

.8466

7/8

.8750

59/64

.9219

1-1/64

1.0156

1-1/32

1.0313

12

.8978

15/16

.9375

61/64

.9531


ST. LOUIS TOOL SUPPLY, INC.
1020 FOX CHASE INDUSTRIAL DR.
ARNOLD, MO 63010
PHONE:  314-894-9090
FAX:  314-894-9094
EMAIL:  CUSTOMERSERVICE@STLTOOL.COM