Tap and Drill sizes - Inch

Inch Sizes - Coarse

  

Inch Sizes - Fine

Tap Size

Drill Size

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Tap Size

Drill Size

0-80

3/64

  

1-72

#53

1-64

#53

  

2-64

#50

2-56

#51

  

3-56

#46

3-48

5-64

  

4-48

#42

4-40

#43

  

5-44

#37

5-40

#39

  

6-40

#33

6-32

#36

  

8-36

#29

8-32

#29

  

10-32

#21

10-24

#25

  

12-28

#15

12-24

#17

  

1/4-28

#3

1/4-20

#7

  

5/16-24

I

5/16-18

F

  

3/8-24

Q

3/8-16

5/16

  

7/16-20

W

7/16-14

U

  

1/2-20

29/64

1/2-13

27/64

  

9/16-18

33/64

9/16-12

31/64

  

5/8-18

34/64

5/8-11

17/32

  

3/4-16

11/16

3/4-10

21/32

  

7/8-14

13/16

7/8-9

49/64

  

1"-12

15/16

1"-8

7/8

  

1-1/8-12

1-3/64

1-1/8-7

63/64

  

1-1/4-12

1-11/64

1-1/4-7

1-7/64

  

1-1/2-12

1-27/64

1-1/2-6

1-11/32

  

1-3/4-12

1-43/64

1-3/4-5

1-35/64

  

2"-12

1-59/64

 

Taper Pipe Sizes - NPT

  

Straight Pipe Sizes - NPS

Tap Size

Drill Size

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Tap Size

Drill Size

1/8-27

R

  

1/8-27

S

1/4-18

7/16

  

1/8-28

5/16

3/8-18

37/64

  

1/4-18

29/64

1/2-14

23/32

  

3/8-18

19/32

3/4-14

59/64

  

1/2-14

47/64

1"-11-1/2

1-5/32

  
3/4-14

15/16

1-1/4-11-1/2

1-1/2

  

1"-11-1/2

1"-3/16

2"-11-1/2

2-7/32

  

1"-1/4-11-1/2

1"-33/64

2"-1/2-8

2-5/8

  

1"-1/2-11-1/2

1"-3/4

3"-8

3-1/4

  

2"-11-1/2

2"-7/32

3"-1/2-8

3-3/4

  

2"-1/2-8

2"-21/32

4"-8

4-1/4

  

3"-8

3"-9/32

 

 

  

3"-1/2-8

3"-25/32

 

 

  

4"-8

4"-9/32

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