BSW/BSF/Whitworth Thread Gauges

BSW / BSF / Whitworth threads are used where clearance between male & female threads is to be controlled.
This uses Imperial system of units.

Specification:

Basic Dimensions- BS 84-2007 & Gauging Practice: BS 919 Part II – 2007.

Manufacturing Range:

Thread Plug & Ring Gauges from Diameter 1/8 to 6″, TPI 40 to 2.5

Dia. Inch

BSW

BSF

BSB

Type of Thread Gauges used

1/8

40

–

26

Thread Plug Gauges.

Thread Ring Gauges.

Check Plug Gauges to Check New Rings.

Wear Check Plug Gauges to Check / Calibrate used Rings.

3/16

24

32

26

    

* 7/32

–

28

*

    

1/4

20

26

26

    

5/16

18

22

26

    

3/8

16

20

26

    

7/16

14

18

26

    

1/2

12

16

26

    

*9/16

12

16

26

    

5/8

11

14

26

    

*11/16

11

14

*

    

3/4

10

12

26

    

7/8

9

11

26

    

1

8

10

26

    

1.1/8

7

9

26

    

1.1/4

7

9

26

    

*1.3/8

–

8

26

    

.1/2

6

8

26

    

1.3/4

5

7

26

    

2

4.5

7

26

    

2.1/4

4

6

*

    

2.1/2

4

6

*

    

2.3/4

3.5

6

*

    

3

3.5

5

*

    

*3.1/4

3.25

5

*

    

3.1/2

3.25

4.5

*

    

*3.3/4

3

4.5

*

    

4

3

4.5

*

    

4.1/2

2.875

4

*

    

5

2.75

–

*

    

5.1/2

2.625

–

*

    

6

2.5

–

*