Sutton Tools Tapping Drill Size Chart - AIMS Industrial Supplies

Threading Tapping Drill Size Chart

M ISO METRIC COARSE (60?)

Tap Size

M1.6 M2 M2.5 M3 M3.5 M4 M4.5 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M42 M45 M48 M52 M56

Pitch mm

0.35 0.4 0.45 0.5 0.6 0.7 0.75 0.8 1.0 1.25 1.5 1.75 2.0 2.0 2.5 2.5 2.5 3.0 3.0 3.5 3.5 4.0 4.5 4.5 5.0 5.0 5.5

Tapping Drill mm

1.25 1.6 2.05 2.5 2.9 3.3 3.7 4.2 5.0 6.8 8.5 10.2 12.0 14.0 15.5 17.5 19.5 21.0 24.0 26.5 29.5 32.0 37.5 40.5 43.0 47.0 50.5

MF ISO METRIC FINE (60?)

M4 M5 M6 M8 M10** M10 M12** M12 M14** M14 M16* M18** M20* M22 M24 M25* M32* M40* M50*

0.5

3.5

0.5

4.5

0.75

5.3

1.0

7.0

1.0

9.0

1.25

8.8

1.25

10.8

1.5

10.5

1.25

12.8

1.5

12.5

1.5

14.5

1.5

16.5

1.5

18.5

1.5

20.5

2.0

22.0

1.5

23.5

1.5

30.5

1.5

38.5

1.5

48.5

*Metric Conduit **Spark Plug

8UN (8 TPI) UNIFIED NATIONAL FORM (60?)

1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 1-7/8 2

8

25.5

8

28.5

8

31.75

8

35.0

8

38.0

8

41.5

8

44.5

8

47.5

UNC UNIFIED NATIONAL COARSE (60?)

Tap Size

#2 (.086) #3 (.099) #4 (.112) #5 (.125) #6 (.138) #8 (.164) #10 (.190) #12 (.216) 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2

TPI

Tapping Drill

mm

56

1.85

48

2.1

40

2.3

40

2.6

32

2.8

32

3.4

24

3.8

24

4.5

20

5.1

18

6.6

16

8.0

14

9.4

13

10.8

12

12.2

11

13.5

10

16.5

9

19.5

8

22.2

7

25.0

7

28.0

6

31.0

6

34.0

5

39.5

4.5

45.0

UNF UNIFIED NATIONAL FINE (60?)

#3 (.099)

56

#4 (.112)

48

#5 (.125)

44

#6 (.138)

40

#8 (.164)

36

#10 (.190)

32

#12 (.216)

28

3/16*

32

1/4

28

5/16

24

3/8

24

7/16

20

1/2

20

9/16

18

5/8

18

3/4

16

7/8

14

1

12

1*

14

1-1/8

12

1-1/4

12

1-3/8

12

1-1/2

12

2.1 2.35 2.65 2.9 3.5 4.1 4.6 4.0 5.5 6.9 8.5 9.8 11.5 12.8 14.5 17.5 20.5 23.5 24.0 26.5 29.5 33.01 36.0

*UNS

UNEF UNIFIED NATIONAL FORM (60?)

1/4 5/16 3/8 1/2 5/8

32

5.6

32

7.2

32

8.8

28

11.8

24

14.75

3/4

20

18

1

20

24.2

BSW BRITISH STANDARD WHITWORTH (55?)

Tap Size

1/16* 3/32* 1/8 5/32* 3/16 7/32* 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-1/2 1-3/4 2

TPI

60 48 40 32 24 24 20 18 16 14 12 12 11 10 9 8 7 7 6 5 4-1/2

Tapping Drill mm

1.2 1.85 2.55 3.2 3.7 4.5 5.1 6.5 7.9 9.3 10.5 12.1 13.5 16.25 19.25 22.0 24.75 28.0 33.5 39.0 44.5

*WHIT. Form

BSF BRITISH STANDARD FINE (55?)

3/16 7/32 1/4 5/16 3/8

32

4.0

28

4.6

26

5.3

22

6.8

20

8.3

7/16 1/2 9/16 5/8 11/16

18

9.8

16

11.0

16

12.7

14

14.0

14

15.5

3/4 7/8 1 1-1/8 1-1/4

12

16.75

11

19.75

10

22.75

9

25.5

9

28.5

1-1/2 1-3/4

8

34.5

7

41.0

BSB BRITISH STANDARD BRASS (55?)

1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1

26

5.2

26

6.8

26

8.4

26

10.0

26

11.6

26

13.2

26

14.8

26

18.0

26

20.8

26

24.3

*Taper pipe threads of improved quality are obtained when the tapping hole is pre-formed using Sutton Taper Pipe Reamers.



Threading Tapping Drill Size Chart

Rc (BSPT)* ISO Rc TAPER SERIES 1:16 (55?)

Tap Size

Rc 1/16 Rc 1/8 Rc 1/4 Rc 3/8 Rc 1/2 Rc 3/4 Rc 1 Rc 1-1/4 Rc 1-1/2 Rc 2

TPI Drill Drill & Only* Reamer

28

6.4

6.2

28

8.4

8.4

19

11.2 10.8

19 14.75 14.5

14 18.25 18.0

14 23.75 23.0

11

30.0 29.0

11

38.5 38.0

11

44.5 44.0

11

56.0 55.0

G (BSPF) ISO G PARALLEL SERIES (55?)

Tap Size

TPI

Tapping Drill

mm

G 1/16

28

6.8

G 1/8

28

8.8

G 1/4

19

11.8

G 3/8

19

15.3

G 1/2

14

19.0

G 5/8

14

21.0

G 3/4

14

24.5

G 7/8

14

28.5

G 1

11

31.0

G 1-1/4

11

39.5

G 1-1/2

11

45.5

G 1-3/4

11

51.5

G 2

11

57.5

G 2-1/2

11

72.5

Rp (BSPPL) SEALING PIPE THREAD PARALLEL (55?)

Rp 1/8 Rp 1/4

28

8.6

19

11.5

Rp 3/8

19

15.0

Rp 1/2

14

18.5

Rp 3/4

14

24.0

Rp 1

11

30.2

Rp 1-1/4

11

39.0

Rp 1-1/2

11

45.0

Rp 2

11

56.4

Pg (Steel Conduit) (80?)

Pg7

20

11.3

Pg9

18

13.9

Pg11

18

17.3

Pg13.5

18

19.1

Pg16

18

21.2

Pg21

15

26.8

THREAD FORMING (FLUTELESS TAPS)

Tap Size

Pitch mm

Tapping Drill mm

METRIC COARSE

M1 M1.1 M1.2 M1.4 M1.6 M1.7 M1.8 M2.0 M2.2 M2.3 M2.5 M2.6 M3 M3.5 M4 M5 M6 M8 M10 M12

0.25

0.9

0.25

1.0

0.25

1.1

0.3

1.28

0.35

1.45

0.35

1.55

0.35

1.65

0.40

1.8

0.45

2.0

0.4

2.1

0.45

2.3

0.45

2.4

0.5

2.8

0.6

3.2

0.7

3.7

0.8

4.6

1.0

5.5

1.25

7.4

1.5

9.3

1.75

11.2

BSW

1/8 5/32 3/16 1/4 5/16 3/8

40

2.9

32

3.6

24

4.3

20

5.8

18

7.3

16

8.8

NPT-NPTF* NATIONAL PIPE TAPER 1:16 (60?)

Tap Size

1/16 1/8 1/4 3/8 1/2 3/4 1 1-1/4 1-1/2 2

TPI

27 27 18 18 14 14 11-1/2 11-1/2 11-1/2 11-1/2

Drill Only*

6.3 8.5 11.0 14.5 18.0 23.0 29.0 37.5 44 55.5

Drill & Reamer

6.0 8.2 10.8 14.0 17.5 23.0 28.5 37.0 43.5 55.0

NPSF NATIONAL PIPE STRAIGHT (60?)

Tap Size

1/8 1/4 3/8 1/2

TPI

Tapping Drill

mm

27

8.6

18

11.3

18

14.5

14

18.0

THREAD FORMING (FLUTELESS TAPS)

Tap Size

T.P.I. Tapping Drill mm

UNC

#1 (.073)

64

1.7

#2 (.086)

56

2.0

#3 (.099)

48

2.3

#4 (.112)

40

2.6

#5 (.125)

40

2.9

#6 (.138)

32

3.2

#8 (.164)

32

3.8

#10 (.190)

24

4.4

#12 (.216)

24

5.0

1/4

20

5.8

5/16

18

7.3

3/8

16

8.8

7/16

14

10.2

1/2

13

11.7

UNF

#1 (.073)

72

1.7

#2 (.086)

64

2.0

#3 (.099)

56

2.3

#4 (.112)

48

2.6

#5 (.125)

44

2.9

#6 (.138)

40

3.2

#8 (.164)

36

3.9

#10 (.190)

32

4.5

#12 (.216)

28

5.1

1/4

28

6.0

5/16

24

7.5

3/8

24

9.0

7/16

20

10.6

1/2

20

12.1

G (BSPF)

1/8

28

9.25

1/4

19

12.5

3/8

19

16.0

1/2

14

20.0

5/8

14

22.0

3/4

14

25.5

7/8

14

29.25

1

11

32.0

BA BRITISH ASSOCIATION (47.5?)

Tap Size

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Pitch mm

1 0.9 0.81 0.73 0.66 0.59 0.53 0.48 0.43 0.39 0.35 0.31 0.28 0.25 0.23 0.21 0.19

Tapping Drill mm

5.1 4.5 4.0 3.4 3.0 2.65 2.3 2.05 1.8 1.55 1.4 1.2 1.05 0.98 0.8 0.7 0.6



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