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Tapping Drills for Taps

TAPPING DRILLS for TAPS (recommended)
 TAP  Sizes (standard flute)  &  Drill Sizes in MM
  Note:-  TPI = Threads per Inch
©=copyright -‘Technical Data’ shown below can be freely used.  This information must NOT be reproduced or published in any article or website, without the written permission of:  The Tap & Die Co, London

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BRITISH STANDARD WHITWORTH FORM THREADS (55o angle)

DIA.

BSW

BSF

BSB

BSP & BSPT

ME/WHITFORM

BSCon

Sizes

TPI

Drill

TPI

Drill

TPI

Drill

TPI

Drill

TPI

Drill

TPI

Drill

1/16”

60

1.2

 

 

 

 

 

 

 

 

 

 

3/32”

48

1.9

 

 

 

 

 

 

 

 

 

 

1/8”

40

2.55

 

 

 

 

28

8.8

40

2.55

 

 

5/32”

32

3.2

 

 

 

 

 

 

40

3.3

 

 

3/16”

24

3.7

32

4.0

 

 

 

 

32, 40

4.0, 4.0

 

 

7/32”

24

4.5

28

4.6

 

 

 

 

40

4.8

 

 

1/4”

20

5.1

26

5.3

26

5.3

19

11.8

24,28,32,40

5.3,5.4,5.5,5.5

 

 

9/32”

20

5.8

26

6.0

26

5.8

 

 

32

6.1

 

 

5/16”

18

6.5

22

6.8

26

5.8

 

 

24, 32, 40

6.75, 7.0, 7.3

 

 

3/8”

16

7.9

20

8.3

26

8.4

19

15.25

24, 32, 40

8.4, 8.6, 8.9

 

 

7/16”

14

9.3

18

9.7

26

10.0

 

 

20,24,32,40

9.8,10,10.3,10.5

 

 

1/2”

12

10.5

16

11.1

26

11.5

14

19.0

20,24,32,40

11.5,11.9,11.9,12

18

11.5

9/16”

12

12.1

16

12.7

26

13.1

 

 

20

13.1

 

 

5/8”

11

13.5

14

14

26

14.7

14

21.0

20

14.5

18

14.2

11/16”

11

15.1

14

15.5

26

16.5

 

 

20

16.2

 

 

3/4”

10

16.25

12

16.75

26

17.8

14

24.5

14, 20

17.1, 17.8

16

17.5

7/8”

9

19.25

11

19.75

26

21.0

14

28.25

14,16, 20

20.2, 20.6, 21.0

16

20.6

15/16”

9

20.6

11

21.5

 

 

 

 

 

 

 

 

1”

8

22.0

10

22.75

26

24.2

11

30.75

12, 20

23.0, 24.0

16

23.8

1.1/8”

7

24.75

9

25.5

26

27.5

 

 

 

 

 

 

1.1/4”

7

28.0

9

28.5

26

30.5

11

39.5

 

 

16

30.1

1.3/8”

6

30.1

8

31.5

26

33.7

 

 

 

 

 

 

1.1/2”

6

33.5

8

34.5

26

36.9

11

45.00

 

 

14

36.1

1.5/8”

5

35.7

8

37.7

26

40.0

 

 

 

 

 

 

1.3/4”

5

39

7

41.0

26

43.5

11

51.0

 

 

 

 

1.7/8”

4.1/2

41.3

7

43.7

26

46.5

 

 

 

 

 

 

2”

4.1/2

44.5

7

47.0

26

49.6

11

57.0

 

 

 

 

BRITISH STD
CYCLE (CEI)

BSCy (60o)

Sizes

TPI

Drill

1/8”

40

2.65

5/32”

32

3.3

3/16”

32

4.1

1/4”

26

5.6

5/16”

26

7.2

3/8”

26

8.7

7/16”

26

10.3

1/2”

26

11.9

9/16”

20

13.1

9/16”

26

13.5

5/8”

20

14.5

5/8”

26

15.0

3/4”

20

17.8

3/4”

26

18.2

MODEL ENGINEER THREADS
(BA + ME + BSB)

DIA

BA  (47.1/2o)

 

DIA

ME  (55o)

 

BSB (55o)

Sizes

Dia

Pitch

TPI

Drill

 

Sizes

TPI

Drill

 

TPI

Drill

0

6.0

1.0

25.4

5.1

 

1/8”

40

2.55

 

 

 

1

5.3

0.9

28.2

4.5

 

5/32”

32

3.2

 

 

 

2

4.7

0.81

31.4

4.0

 

5/32”

40

3.3

 

 

 

3

4.1

0.73

34.8

3.4

 

3/16”

32

4.0

 

 

 

4

3.6

0.66

38.5

3.0

 

3/16”

40

4.0

 

 

 

5

3.2

0.59

43.0

2.65

 

7/32”

32

 

 

 

 

6

2.8

0.53

47.9

2.3

 

7/32”

40

4.8

 

 

 

7

2.5

0.48

52.9

2.05

 

1/4”

32

5.5

 

26

5.3

8

2.2

0.43

59.1

1.8

 

1/4”

40

5.5

 

 

 

9

1.9

0.39

65.1

1.55

 

9/32”

32

6.1

 

26

6.1

10

1.7

0.35

72.6

1.4

 

9/32”

40

 

 

 

 

11

1.5

0.31

81.9

1.2

 

5/16”

32

7.0

 

26

5.8

12

1.3

0.28

90.9

1.05

 

5/16”

40

7.3

 

 

 

13

1.2

0.25

102.0

0.98

 

3/8”

32

8.6

 

26

8.4

14

1.0

0.23

109.9

0.80

 

3/8”

40

8.9

 

 

 

15

0.9

0.21

120.5

0.70

 

7/16”

32

10.3

 

26

10

16

0.79

0.19

133.3

0.60

 

7/16”

40

10.5

 

 

 

 

 

 

 

 

 

1/2”

32

11.9

 

26

11.5

 

 

 

 

 

 

9/16”

 

 

 

26

13.1

 

 

 

 

 

 

5/8”

 

 

 

26

14.7

 

 

 

 

 

 

3/4”

 

 

 

26

17.8

AMERICAN NATIONAL FORM THREADS (60o angle)

DIA.

UNC

UNF

NPT & NPS

UNS

DIA

UNC

UNF

Sizes

TPI

Drill

TPI

Drill

TPI

Drill

TPI

Drill

Size No

TPI

Drill

TPI

Drill

1/16”

 

 

 

 

27

6.3

64

1.2

0

 

 

80

1.25

3/32”

 

 

 

 

 

 

48

1.85

1

64

1.55

72

1.55

1/8”

 

 

 

 

27

8.7

40

2.6

2

56

1.85

64

1.9

5/32”

 

 

 

 

 

 

32 & 40

3.2 & 3.3

3

48

2.1

56

2.15

3/16”

 

 

 

 

 

 

32 & 40

4.0 & 4.0

4

40

2.35

48

2.4

7/32”

 

 

 

 

 

 

24 & 32

4.5 & 4.8

5

40

2.65

44

2.7

1/4”

20

5.1

28

5.5

18

11.1

24 & 32

5.30 & 5.6

6

32

2.85

40

2.95

5/16”

18

6.6

24

6.9

 

 

20 & 32

6.7 & 7.2

8

32

3.5

36

3.5

3/8”

16

8.0

24

8.5

18

14.5

20

8.30

10

24

3.9

32

4.1

7/16”

14

9.4

20

9.9

 

 

24

10.0

12

24

4.5

28

4.70

1/2”

13

10.8

20

11.5

14

18.0

12 & 24

10.5 & 11.5

 

 

 

 

 

9/16”

12

12.2

18

12.9

 

 

 

 

 

 

 

 

 

5/8”

11

13.5

18

14.5

 

 

12

13.9

 

 

 

 

 

11/16”

 

 

 

 

 

 

11 & 16

15.0 & 15.9

 

 

 

 

 

3/4”

10

16.5

16

17.5

14

23.25

12

16.7

 

 

 

 

 

7/8”

9

19.5

14

20.4

 

 

12

20.2

 

 

 

 

 

1”

8

22.25

12

23.25

11.5

29.0

14

23.5

 

 

 

 

 

1.1/8”

7

25.0

12

26.5

 

 

 

 

 

 

 

 

 

1.1/4”

7

28.0

12

29.5

11.5

38.0

 

 

 

 

 

 

 

1.3/8”

6

30.75

12

32.75

 

 

 

 

 

 

 

 

 

1.1/2”

6

34.0

12

36.0

 

 

 

 

 

 

 

 

 

1.3/4”

5

39.5

 

 

 

 

 

 

 

 

 

 

 

METRIC FORM THREADS (60o angle)

MM

Coarse

 

Fine-special

Sizes

Pitch

Drill

 

Pitch

Drill

0.8

.19

0.6

 

(=16BA)

0.6

0.9

.21

0.7

 

(=15BA)

0.7

1

.25

0.8

 

(=14BA)

0.8

1.2

.25

1.0

 

 

 

1.3

.28

1.05

 

(=12BA)

1.05

1.4

.3

1.1

 

 

 

1.5

.3

1.2

 

(=11BA)

1.2

1.6

.35

1.25

 

 

 

1.7

.35

1.35

 

(=10BA)

1.4

1.8

.35

1.45

 

 

 

1.9

.39

1.55

 

(=9BA)

1.55

2

.4

1.60

 

.45

1.55

2.2

 

 

 

.45

1.75

2.3

 

 

 

.4

1.9

2.5

.45

2.05

 

.35, .4

2.15, 2.1

2.6

 

 

 

.45

2.15

3

.5

2.5

 

.35, .45

2.65, 2.55

3.5

.6

2.9

 

.35, .6

3.15, 2.9

4

.7

3.3

 

.5, .75

3.5, 3.25

4.5

.75

3.7

 

.5

4.0

5

.8

4.2

 

.5, .75, .9

4.5, 4.25, 4.1

6

1

5.0

 

.5, .75

5.5, 5.25

7

1

6.0

 

.75

6.25

8

1.25

6.8

 

.75, 1

7.2, 7.0

9

1.25

7.75

 

1

8.0

METRIC FORM THREADS (60o angle)

MM

Coarse

 

Fine-special

Sizes

Pitch

Drill

 

Pitch

Drill

10

1.5

8.5

 

1, 1.25

9, 8.75

11

1.5

9.5

 

1

10.0

12

1.75

10.2

 

1, 1.25, 1.5

11,10.75,10.5

14

2

12.0

 

1,1.25, 1.5

13,12.75,12.5

16

2

14.0

 

1, 1.5

15.0, 14.5

18

2.5

15.5

 

1.0, 1.5

17.0, 16.5

20

2.5

17.5

 

1, 1.5

19.0, 18.5

22

2.5

19.5

 

1.5, 2

20.5, 20.0

24

3

21.0

 

1.5, 2

22.5, 22.0

25

 

 

 

1.5, 2

23.5, 23.0

27

3

24.0

 

2

25.0

30

3.5

26.5

 

1.5, 2

28.5, 28.0

32

3.5

30.5

 

1.5

30.5

33

3.5

29.5

 

1.5, 2

31.5, 31.0

36

4

32.0

 

1.5

34.5

39

4

35.0

 

1.5

37.5

40

 

 

 

1.5

38.5

42

4.5

37.5

 

1.5

40.5

45

4.5

40.5

 

1.5

43.5

48

5

43.0

 

1.5

46.5

50

 

 

 

1.5

48.5

52

5

47.0

 

1.5

50.5

56

5.5

50.5

 

 

 

60

5.5

45.5

 

 

 

Spark plug taps = 10x1, 12x1.25, 14x1.25, 18x1.5

Conduit taps = 16x1.5, 20x1.5, 25x1.5, 32x1.5, 50x1.5

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©=copyright - ‘Technical Data’ shown in our site can be freely used.  This information must NOT
be reproduced or published in any article or website, without the written permission of:
 The Tap & Die Co, London