BSPP (G) / BSPT (R)-International Standards-APPORO

Trang chủ » G1/4 Vs R1/4 » BSPP (G) / BSPT (R)-International Standards-APPORO

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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

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