4155 N. 1000E (Wally Parks Dr.)
Adjacent To O'Reilly Raceway Park
Brownsburg, IN 46112
8:00 - 5:00 M-F, 8:00 - 12:00 Sat. - EST
 

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Tap Drill Sizes

U.S. Tap Drill Metric Tap Drill Pipe Tap Drill Printable Chart
 

U.S. Tap Drill

Bolt Size

Threads per Inch (TPI)

Minor (root) Dia.

Tap Drill Size (75% thread)

Clearance Hole Drill Size

Close Fit

Free Fit

Dia.

Major Dia.

Drill Size

Decimal Equiv.

Drill Size

Decimal Equiv.

Drill Size

Decimal Equiv.

# 4

.1120

40

.0813

43

.0890

32

.1160

30

.1285

# 6

.1380

32

.0997

36

.1065

27

.1440

25

.1495

# 8

.1640

32

.1257

29

.1360

18

.1695

16

.1770

#10

.1900

24

.1389

25

.1495

9

.1960

7

.2010

32

.1517

21

.1590

# 12

.2160

24

.1649

16

.1770

2

.2210

1

.2280

1/4

.2500

20

.1887

7

.2010

F

.2570

H

.2660

28

.2062

3

.2130

5/16

.3125

18

.2443

F

.2570

P

.3230

Q

.3320

24

.2614

I

.2720

3/8

.3750

16

.2983

5/16

.3125

W

.3860

X

.3970

24

.3239

Q

.3320

7/16

.4375

14

.3499

U

.3680

29/64

.4531

15/32

.4687

20

.3762

25/64

.3906

1/2

.5000

13

.4056

27/64

.4219

33/64

.5156

17/32

.5312

20

.4387

29/64

.4531

9/16

.5625

12

.4603

31/64

.4844

37/64

.5781

19/32

.5938

18

.4943

33/64

.5156

5/8

.6250

11

.5135

17/32

.5312

41/64

.6406

21/32

.6562

18

.5568

37/64

.5781

3/4

.7500

10

.6273

21/32

.6562

49/64

.7656

25/32

.7812

16

.6733

11/16

.6875

7/8

.8750

9

.7387

49/64

.7656

57/64

.8906

29/32

.9062

14

.7874

13/16

.8125

1

1.000

8

.8466

7/8

.8750

1-1/64

1.0156

1-1/32

1.0313

12

.8978

15/16

.9375

 

Metric Fine Thread

Thread Size Tap Drill (mm)
M4 x 0.35 3.65
M4 x 0.5 3.50
M5 x 0.5 4.50
M6 x .5 5.50
M6 x .75 5.25
M7 x .75 6.25
M8 x .5 7.50
M8 x .75 7.25
M8 x 1 7.00
M9 x 1 8.00
M10 x 0.75 9.25
M10 x 1 9.00
M10 x 1.25 8.75
M11 x 1 10.00
M12 x .75 11.25
M12 x 1 11.00
M12 x 1.5 10.50

Metric Coarse Thread

Thread Size Tap Drill (mm)
M4 x 0.7 3.30
M4.5 x 0.75 3.75
M5 x 0.8 4.20
M6 x 1 5.00
M7 x 1 6.00
M8 x 1.25 6.85
M9 x 1.25 7.75
M10 x 1.5 8.50
M11 x 1.5 9.50
M12 x 1.75 10.25

For Metric sizes only. Diameter of thread minus the pitch equals the tap drill size.
e.g. M6 x 1
6 - 1 = 5mm

Pipe Threads

  American Standard (NPT)

British Standard (BSP)

Nominal OD Threads per inch Drill Size Threads per inch Drill Size
1/8 27 R 28 11/32
1/4 18 7/16 19 15/32
3/8 18 37/64 19 39/64
1/2 14 23/32 14 3/4
5/8 - - 14 53/64
3/4 14 59/64 14 31/32

Custom Hoses

Brake, clutch and other hi-pressure applications
(steel braided, crimp on ends - straight, 45,
90, banjo)
Many colors available

Stop By The Store


 

 


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