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Basics of thread

 

MORE INFORMATION?

Do you need more information about thread types or are you looking for a special solution? Please contact our Sales Engineers.

Teesing Sales Engineers

TEESING SALES ENGINEERS
Tel.   +31 70 413 07 50
Mail  sales@teesing.com

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.

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

Thread size (inch) Major diameter (mm) Minor diameter (mm) TPI
G 1/16" 7,723 6,561 28
G 1/8" 9,728 8,566 28
G 1/4" 13,157 11,445 19
G 3/8" 16,662 14,950 19
G 1/2" 20,955 18,631 14
G 3/4" 26,441 24,117 14
G 1" 33,249 30,291 11
G 2" 59,614 56,656 11
BSPP

Male thread size (inch) Female thread size (inch) Major diameter (mm) Minor diameter (mm) TPI
R 1/16" Rp 1/16" 7,723 6,490 28
R 1/8" Rp 1/8" 9,728 8,495 28
R 1/4" Rp 1/4" 13,157 11,341 19
R 3/8" Rp 3/8" 16,662 14,846 19
R 1/2" Rp 1/2" 20,955 18,489 14
R3/4" Rp 3/4" 26,441 23,975 14
R 1" Rp 1" 33,249 30,111 11
R2" Rp 2" 59,614 56,476 11
BSPT