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British Pipe Threads

 

Taps | Taps drill sizes




55 degree Whitworth Thread Form. Whitworth Pipe Threads are used almost exclusively by countries which are otherwise on the metric system.

 

"G: Series British Standard Pipe - Parallel ( Straight ) BSP or BSPF

Also referred to as British Gas, British Pipe Parallel or Parallel Fastening thread.

Various Symbols: BSP, BSPP, BSSPI, BSPF, BSPG, PS, R, G.

Taps Marked " G Size I.S.O."

"Rc: Series British Standard Pipe - Taper- BSPT

Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread.

Taper is 3/4" taper per foot ( 1 in 16 on the diameter)

Various Symbols: BSPT, BSPTr, PT, KR, Rc.

Taps Marked " Rc Size I.S.O."


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BSP British Straight and Taper Pipe Taps
BSP and BSPT
Nominal Size
(inches)		 T P I Major Diameter
(inches)
1/8" 28 0.383
1/4" 19 0.518
3/8" 19 0.656
1/2" 14 0.825
5/8" 14 0.902
3/4" 14 1.041
7/8" 14 1.189
1" 11 1.309

 1-1/4"

11

 1.650

 1-1/2"

11

1.882

1-3/4"

11

2.116

2"

11

2.347

2-1/4"

11

2.587

2-1/2"

11

2.960

3"

11

3.460


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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"

 

 



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Newman Tools Inc.
185 Iber Road
Stittsville, Ottawa, Ontario, Canada K2S 1E7
Phone: 1-613-836- 6776 or 1-800-465-1384
Fax: 1-613 -836 -9070 or 1-800-605-2442
 
 

Newman Tools Inc.
151 New Park Avenue
Hartford, CT 06106, USA
Phone: 1-800-465-1384
Fax: 1-800-605-2442

Email:     info@newmantools.com



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updated January 2007
Newman Tools Inc.June 2003
Newman Tools Inc.