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What does R, Rp, Rc, G mean?

Published 10 December 2015 in

R, Rp, Rc threads are taken from BS EN 10226-3:2005 pipe threads where pressure-tight joints are made on the threads.

G threads are taken from BS EN ISO 228-2:2003 pipe threads where pressure-tight joints are not made on the threads. The pressure tight joint is achieved by the compression of a soft material (such as an o-ring seal or washer) between the end face of the male thread and a socket or nipple face, with a tightening of a back nut.