BRITISH STANDARD WHITWORTH FORM THREADS THREAD ANGLE 55°BRITISH STANDARD WHITWORTH FORM THREADS BA THREAD ANGLE 47½°BRITISH STANDARD WHITWORTH FORM THREADS BS CY. THREAD ANGLE 60°AMERICAN NATIONAL THREADS THREAD THREAD ANGLE 60°MM (METRIC) THREAD ANGLE 60°

 

Size

TPI

Drill Size
in mm

1/8"

40

2.65

5/32"

32

3.30

3/16"

32

4.10

7.32"

26

4.80

1/4"

26

4.80

9/32"

26

6.35

5/16"

26

7.20

3/8"

26

8.70

7/16"

26

10.30

1/2"

26

11.90

9/16"

20

13.10

9/16"

26

13.50

5/8"

26

15.00

11/16"

26

16.70

3/4"

26

18.20

1"

24

24.50

 

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