BSP = British Standard
Pipe. This designation can be used to broadly define either British Standard Pipe Taper or British Standard Pipe Parallel which leaves a question as to which of the two is actually designated. It is best to avoid this designation at all times. more
Rc = internal tapered threads for fits made on the thread per ISO-7
& BS-21. Per the standard Rc mates with R.
Rp = internal parallel thread for fits made on the thread per ISO-7
& BS-21. Per the standard Rp mates with R.
Rs = external parallel thread for fits made on machined face per
BS-21 Appendix C.
G = internal or external threads for fits where seal is not on
the thread per ISO-228 & obsolete
BS-2779. G series is designed to mate with G series.
Original Posting: 12/12/2008
Last Revision: 6/20/2012
Error corrections in, or comments about, the above data can be sent