Tap Drill Chart

Tap Size

Drill Size

M1.6 x 0.35

1.25mm

M2 x 0.4

1/16

M2.5 x 0.45

2.05mm

M3 x 0.5

#40

M3 x 0.6

2.5mm

M3.5 x 0.6

#33

M4 x 0.7

3.3mm

M4 x 0.75

3.4mm

M5 x 0.8

4.2mm

M5 x 0.9

4.2mm

M6 x 1

5mm

M6.3 x 1

5.5mm

M7 x 1

6.1mm

M8 x 1

7.1mm

M8 x 1.25

6.7mm

M9 x 0.75

8.3mm

M9 x 1

8.1mm

M9 x 1.25

7.9mm

M10 x 1

9.1mm

M10 x 1.25

8.9mm

M10 x 1.5

8.4mm

M11 x 1.50

9.7mm

M12 x 1.25

10.9mm

M12 x 1.5

10.7mm

M12 x 1.75

13/32

M14 x 1.25

12.8mm

M14 x 1.5

12.7mm

M14 x 2

15/32

M16 x 1.5

14.7mm

M16 x 2

35/64

M18 x 1.5

16.8mm

M18 x 2.5

15.8mm

M20 x 2.5

11/16

M22 x 1.5

20.9mm

M24 x 2

22.3mm

M24 x 3

53/64

M30 x 3.5

1-3/64

M36 x 4

1-1/4

Tap Size

Drill Size

1/4-20NC

#8

5/16-18NC

F

3/8-16NC

5/16

7/16-14NC

U

1/2-13NC

27/64

9/16-12NC

31/64

5/8-11NC

14mm

3/4-10NC

21/32

7/8-9NC

49/64

1-8NC

7/8

1 1/8-7NC

63/64

1 1/4-7NC

1-7/64

1 3/8-6NC

1-3/16

1 1/2-6NC

1-11/32

Tap Size

Drill Size

5/32-32NS

1/8

5/32-36NS

#30

3/16-24NS

#26

3/16-32NS

#22

7/32-24NS

#16

7/32-32NS

#12

1/4-32NS

7/32

1/4-40NS

#1

5/16-32NS

9/32

11/16-16NS

5/8

1-14NS

15/16

Tap Size

Drill Size

1/8-27NPT

R

1/4-18NPT

7/16

3/8-18NPT

15mm

1/2-14NPT

23/32

3/4-14NPT

59/64

1 x11-1/2NPT

1-5/32

1-1/4x11-1/2NPT

1-1/2

1-1/2x11-1/2NPT

1-47/64

2x 11-1/2NPT

2-7/32

Tap Size

Drill Size

1/4-28NF

#3

5/16-24NF

I

3/8-24NF

Q

7/16-20NF

W

1/2-20NF

29/64

9/16-18NF

33/64

5/8-18NF

37/64

3/4-16NF

11/16

7/8-14NF

13/16

1-12NF

29/32

1 1/8-12NF

1-3/64

1 1/4-12NF

1-11/64

1 3/8-12NF

1-19/64

1 1/2-12NF

1-27/64

Tap Size

Drill Size

0-80

3/64

1-64

#53

1-72

#53

2-56

#51

2-64

#50

3-48

5/64

3-56

#46

4-36

#44

4-40

#44

4-48

#42

5-40

#39

5-44

#38

6-32

#36

6-40

#33

8-32

#29

8-36

#29

10-24

#25

10-32

#21

12-24

#17

12-28

#15

14-20

#10

14-24

#7