G/R/RP-Withworth Thread (BSPP/BSPT) - Teesing

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The most common types of Whitworth thread are:

  • BSPP (G) – British Standard Pipe Parallel
  • BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread

An appropriate sealing compound can be used in the thread to ensure a leakproof joint.If you have any questions please contact us or check out our fittings with BSPP/ BSPT (G) thread.

BSPP (G) Female and male thread are both parallel.

∅Drill ∅B∅TPI
G 1/167,7236,56128
G 1/89,7288,56628
G 1/413,15711,44519
G 3/816,66214,95019
G 1/220,95518,63114
G 3/426,44124,11714
G 133,24930,29111
G 259,61456,65611
BSPP thread

BSPT (R/Rp)Female thread is parallel and male thread is tapered.Female thread can also be tapered: Rc, but this is not common.

Male thread size (inch)Female thread size (inch)Major diameter (mm)Minor diameter (mm)TPI
R 1/16Rp 1/167,7236,49028
R 1/8Rp 1/89,7288,49528
R 1/4Rp 1/413,15711,34119
R 3/8Rp 3/816,66214,84619
R 1/2Rp 1/220,95518,48914
R 3/4Rp 3/426,44123,97514
R 1Rp 133,24930,11111
G 2Rp 259,61456,47611
BSPT thread

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