British Pipe Threads Taps

taper pipe tap

Taps | Taps drill sizes

Order on line BSPT Taps, Rc Series

Order on line BSP Taps, "G" Series

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.

"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.


 

 

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 index page

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