Technical Specification Materials of Construction Standard coupling housings are stainless steel, carbon steel and aluminium. Other materials are available on request. Couplings are offered subject to customers approval and acceptance of specification. Sizes Standard nominal bores available: 1", 1.5", 2", 2.5", 3", 4", 5", 6", 8", 10" & 12" Pressure Ratings Standard range design pressure 4" = 40 BAR (580PSI) Standard range design pressure 5" = 27 BAR (391PSI) Standard range design pressure 6" = 23 BAR (333PSI) Standard range design pressure 8" = 17 BAR (246PSI) Standard range design pressure 10" = 14 BAR (203PSI) Standard range design pressure 12" = 10 BAR (145PSI) End Connections Threaded male or female, tapered or parallel Flanged Weld prepared ends Non standard configurations are also available on request Breaking Loads Coupling break-loads can be varied to suit any particular application.