Tap and Drill sizes - Inch

Inch Sizes - Coarse

 

Inch Sizes - Fine

Tap Size

Drill Size

bbb

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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