Drill Selection Charts Print this page

DRILL AND TAPPING CHART

> BSW Whitworth

UNC UNS*

UNF UNS*

Metric ISO Course

Metric ISO Fine

BSF

BA

Metric Conduit

BSPT (Taper Pipe)

NPT (Taper Pipe)

NPS (Parallel Pipe)

BSPF (Parallel Pipe)

Brass

Spark Plug

BS Conduit

BSW Whitworth

55° thread form

Size
inch

Threads
per
inch

Tapping Drill Sizes

Preferred
mm   -  inch

Alternative
mm  -  inch

1/16*

60

1.2

3/64

1.05

3/32*

48

1.9

1.75

1/8

40

2.55

2.5

3/32

5/32*

32

3.2

1/8

2.95

3/16

24

3.7

3.6

9/64

7/32*

24

4.5

4.3

11/64

1/4

20

5.1

5.0

3/16

5/16

18

6.5

6.4

1/4

3/8

16

7.9

5/16

7.8

19/64

7/16

14

9.5

9.2

23/64

1/2

12

10.5

13/32

9/16

12

12.0

15/32

5/8

11

13.5

17/32

33/64

3/4

10

16.5

41/64

16.0

5/8

7/8

9

3/4

19.0

47/64

1

8

22.0

55/64

27/32

1-1/8

7

31/32

24.5

61/64

1-1/4

7

28.0

1-3/32

27.5

1-5/64

1-1/2

6

33.5

1-5/16

33.0

1-19/64

1-3/4

5

39.0

1-17/32

38.5

1-33/64

2

4 1/2

44.5

1-49/64

44.0

1-3/4

> BSW Whitworth

UNC UNS*

UNF UNS*

Metric ISO Course

Metric ISO Fine

BSF

BA

Metric Conduit

BSPT (Taper Pipe)

NPT (Taper Pipe)

NPS (Parallel Pipe)

BSPF (Parallel Pipe)

Brass

Spark Plug

BS Conduit

 

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