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BSPT = British Standard Pipe Taper

BSPT = British Standard Pipe Taper

BSPT is an obsolete screw thread designation which is still in common usage. It has been replaced with the R-Series designations. What was BSPT screw thread is now R-Series screw thread with no major physical differences.

The screw thread is defined in at least three places: BS-21 and ISO-7 and EN-10226. These three screw thread standards, as they relate to the product screw threads are technically equivalent.

The R-Series of threads includes:
R = external tapered thread for fits made on the thread per ISO-7/1 & BS-21 & EN-10226/1 & EN-10226/2.
Rc = internal tapered threads for fits made on the thread per ISO-7/1 & BS-21 & EN-10226/2.
Rp = internal parallel thread for fits made on the thread per ISO-7/1 & BS-21 & EN-10226/1.
Rs = external parallel thread for fits made on machined face per BS-21 Appendix C.

EN-10226/3 and ISO-7/2 agree on the gage designs. The screw thread gages defined in BS-21 are different from those in ISO-7/2 & EN-10226/3. The differences are for the most part minor and will only result in variation between types at the edge of the product tolerances.

As always, obtain approval or consensus from your customer. This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root documents: ISO-7 or BS-21 or EN-10226 which are copyrighted document. To purchase a copy visit an Authorized Reseller.

Original Posting: 10/17/2008
Last Revision: 8/7/2014
Error corrections in, or comments about, the above data can be sent to: office@gagecrib.com.

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