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British Standard Pipe Taper thread (R)

Taper threads, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R. The taper is 1:16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.

 

 

The thread form follows the British Standard Whitworth standard:

1.) Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane)

2.) One-sixth of this sharp V is truncated at the top and the bottom

3.) The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373P

4.) The theoretical depth of the thread is therefore 0.6403 times the nominal pitch h ≈ 0.6403P

 

 

  Male Thread size (inch)     Female Thread size (inch)     TPI     Major diameter (mm)     Minor diameter (mm)  
R 1/16" Rp 1/16" 28 7.72 6.56
R 1/8" Rp 1/8" 28 9.73 8.57
R 1/4" Rp 1/4" 19 13.16 11.45
R 3/8" Rp 3/8" 19 16.66 14.95
R 1/2" Rp 1/2" 14 20.96 18.63
R 5/8" Rp 5/8" 14 22.91 18.63
R 3/4" Rp 3/4" 14 26.44 20.59
R 7/8" Rp 7/8" 14 30.20 27.88
R 1" Rp 1" 11 33.25 30.29
R 1-1/8" Rp 1-1/8" 11 37.90 34.94
R 1-1/4" Rp 1-1/4" 11 41.91 38.95
R 1-3/8" Rp 1-3/8" 11 44.32 41.37
R 1-1/2" Rp 1-1/2" 11 47.80 44.85
R 1-5/8" Rp 1-5/8" 11 52.88 49.93
R 1-3/4" Rp 1-3/4" 11 53.75 50.79
R 1-7/8" Rp 1-7/8" 11 57.00 54.04
 R 2"  Rp 2" 11 59.61 56.66

BSPT R Rc British Standard Pipe Taper thread assembly

 

 

British Standard Pipe thread (G)

British Standard Pipe Parallel thread (BSPP, originally also known as British Standard Pipe Fitting thread/BSPF and British Standard Pipe Mechanical thread/BSPM), which have a constant diameter; denoted by the letter G (*Ref).

 

 

The thread form follows the British Standard Whitworth standard:

1.) Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane)

2.) One-sixth of this sharp V is truncated at the top and the bottom

3.) The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373P

4.) The theoretical depth of the thread is therefore 0.6403 times the nominal pitch h ≈ 0.6403P

 

 

  Thread size (inch)     TPI     Major diameter (mm)     Minor diameter (mm)  
G 1/16" 28 7.72 6.56
G 1/8" 28 9.73 8.57
G 1/4" 19 13.16 11.45
G 3/8" 19 16.66 14.95
G 1/2" 14 20.96 18.63
G 5/8" 14 22.91 18.63
G 3/4" 14 26.44 20.59
G 7/8" 14 30.20 27.88
G 1" 11 33.25 30.29
G 1-1/8" 11 37.90 34.94
G 1-1/4" 11 41.91 38.95
G 1-3/8" 11 44.32 41.37
G 1-1/2" 11 47.80 44.85
G 1-5/8" 11 52.88 49.93
G 1-3/4" 11 53.75 50.79
G 1-7/8" 11 57.00 54.04
 G 2" 11 59.61 56.66

BSPP G British Standard Pipe Parallel assembly

*Ref: Learn more about British Standard Pipe