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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

 

Please note : Tradezone Ltd accepts no liability for any loss or damage either direct or consequential aising out of or in relation to the use or application of the information or products referred to herein.

 

 

 

 

 

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