British Size Taps and Dies

london bridge

BSW | BSF | BSB | BA
pipe sizes: BSPT | BSP

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British Standard Whitworth


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

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

 




 

 

British 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

 







 

 

British 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

 




 

 



BSPT - 1:16 Taper Pipe

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add to cart

BSPT

Size
Number
Or Inch


Pitch
TPI
1/8
1/4
3/8

1/2
3/4
1

1-1/4
1-1/2
2

2-1/2
28
19
19

14
14
11

11
11
11

11

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

example

TAP1/4BSPT for 1/4 BSPT tap

order on line
add to cart

 

tap drill sizes





 

 


BSP Pipe

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add to cart

BSP

Size
Number
Or Inch


Pitch
TPI
1/8
1/4
3/8

1/2
5/8
3/4

7/8
1
1-1/8

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

2
2-1/4
2-1/2

3
28
19
19

14
14
14

14
11
11

11
11
11

11
11
11

11

 

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

example

TAP1/4BSP for 1/4 BSP tap

order on line
add to cart

 

tap drill sizes

suggested tap drill sizes

British Standard Pipe
Parallel or Taper
BSP or BSPT

Nominal Size
(inches)
T P I Major Diameter
(inches)
Tapping Drill Size Tapping Drill Size
     
BSP
BSPT
         
1/16
28
0.304
6.6 mm  
 Letter drill G  
1/8
28
0.383
8.8 mm  8.4mm
 11/32 inch 21/64"
1/4
19
0.518
11.8 mm 11.2mm
 29/64"
7/16"
3/8
19
0.656
15.25 mm  14.75mm
 19/32" 37/64"
1/2
14
0.825
19.00mm 18.25mm
 
3/4"
23/32"
5/8
14
0.902
21 mm  
 53/64"  
3/4
14
1.041
24.5 mm 23.75mm
 31/32" 15/16"
7/8
14
1.189
28.25 mm  
 1-7/64"  
1 inch
11
1.309
30.75 mm 30mm
 1-13/64" 1-11/64"
1-1/4"
11
1.650
39.50 mm
38.5mm
 1-35/64" 1-33/64"
1-1/2"
11
1.882
45.5 mm
44.5mm
 1-25/32" 1-3/4"
1-3/4"
11
2.116
51.00 mm
 
 2"  
2"
11
2.347
57 mm
56mm
 2-1/4" 2-3/16"

 

 

link to tap and die index page



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