British Size Taps and Dies

london bridge

BSW | BSF | BSB | BA

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DEFINITION: Tap and Dies

Taps and dies are tools used to create screw threads, which is called threading. Many are cutting tools; others are forming tools. A tap is used to cut or form the female portion of the mating pair (e.g. a nut). A die is used to cut or form the male portion of the mating pair (e.g. a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading.

Wikipedia

British Size Threads or Whitworth Threads

Commonly knows as British Size or Whitworth Thread this was the thread system used by Great Britain and the British Colonies before 1970.
The United Kingdom adopted the Metric system in the 1970's.

 

 

 


BSW

BSW is a 55° degree included angle thread form commonly known as Britsh Standard Whitworth and Whitworth Coarse Thread Series.


BSW

Size
Number
Or Inch


Pitch
TPI
1/8
5/32
3/16

1/4
5/16
3/8

7/16
1/2
9/16

5/8
11/16
3/4

7/8
1
1-1/8

1-1/4
1-3/8
1-1/2

1-3/4
2
2-1/4

2-1/2
40
32
24

20
18
16

14
12
12

11
11
10

9
8
7

7
6
6

5
4.5
4

4



when ordering taps please specify the diameter and pitch and style of tap

example

TAP1/4BSW.1 for 1/4 BSW taper tap
TAP1/4BSW.2 for 1/4 BSW plug tap
TAP1/4BSW.3 for 1/4 BSW bottoming tap

 


 

 

 

British Standard Fine

BSF is a 55° degree included angle thread form commonly known as Britsh Standard Fine and Whitworth Fine Thread Series.


BSF

Size
Number
Or Inch


Pitch
TPI
3/16
1/4
5/16

3/8
7/16
1/2

9/16
5/8
3/4

7/8
1
32
26
22

20
18
16

16
14
12

11
10


when ordering taps please specify the diameter and pitch and style of tap

example

TAP1/4BSF.1 for 1/4 BSF taper tap
TAP1/4BSF.2 for 1/4 BSF plug tap
TAP1/4BSF.3 for 1/4 BSF bottoming tap

 


 

 

BSB

BSB is a 26 TPI ( twenty six threads per inch ), 55° degree included angle thread form commonly called Britsh Standard Brass


BSB

Size
Number
Or Inch


Pitch
TPI
1/4
5/16
3/8

7/16
1/2
26
26
26

26
26




when ordering taps please specify the diameter and pitch and style of tap

example

TAP1/4BSB.1 for 1/4 BSB taper tap
TAP1/4BSB.2 for 1/4 BSB plug tap
TAP1/4BSB.3 for 1/4 BSB bottoming tap

 




 

 

BA

BA is a 47-1/2° degree included angle thread form commonly known as Britsh Association.

BA

Size
Number
No 14
No 13
No 12

No 11
No 10
No 9

No 8
No 7
No 6

No 5
No 4
No 3

No 2
No 1
No 0


when ordering taps please specify the style of tap

example

TAP4BA.1 for 4 BA taper tap
TAP4BA.2 for 4 BA plug tap
TAP4BA.3 for 4 BA bottoming tap

 

 

 

link to tap and die index page


pipe sizes: BSPT | BSP


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