EN-10226 Rp-series internal screw threads should be checked with EN-10226 Rc Tapered Screw Thread Plug Gages: EN-10226 Gage-1* AND EN-10226 Gage-2*. BS-21 Rp internal screw threads should be checked with BS-21 Rc Tapered Screw Thread Plug Gage. We recommend that you use gages which are defined in a specification. Below is a chart displaying the G1” minor diameters compared with the Rp1” minor diameters: Because the Rp screw thread is designed to seal on the mating R external thread it has a much tighter tolerance and care must be taken when machining the Rp-series to assure that the minor diameters are within tolerance. There is more to the screw threads than the effective pitch diameters. Below is a chart displaying the G1” effective pitch diameters compared with the Rp1” effective pitch diameters: I think a basic understanding of the two screw threads is embodied in a comparison of their effective pitch diameters. The G-series screw thread is not intended for a seal being made on the screw thread where the Rp-series screw thread is specifically designed to seal when mated with an R-series tapered external screw thread. The G-series screw thread may be internal screw thread or external screw thread where the Rp-series screw thread is only internal screw thread. The G-series screw thread is made to ISO-228 while the Rp-series screw thread is made to ISO-7 or BS-21 or EN 10226-1. The differences between the G-series screw thread and the Rp-series screw thread include: Both have the matching size designations (nominal major diameter and threads-per-inch). Both have the Whitworth 55° included thread angle form with Full Form rounded root and crest of thread.Ĭ. Both are British Standard Pipe Parallel.ī. The G-series and the Rp-series British Standard Screw Threads have much in common:Ī.
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