So I've downloaded several hydraulic fitting references including Parker-Hannafin and discounthydraulichose.com and get great information on the thread sizes of connectors compared to nominal fractional size and dash size for 37 deg. flare, 30 deg. flare, and various o-ring style seals, but cannot find documentation for Metric ORFS. The Parker Catalogue destincdtly recognizes the existence of Metric ORFS and offers a range of fittings but unlike fractional where they have nice chart equating the nominal size with the size of the male thread and thread pitch on the connectors, the Metric sizes are listed only by the nominal tube size and there is no reference to thread diameters or pitch. This is supposed to be the cats meow of hydraulic connections and most hoses on Hitachi excavator (EX60 URG) are Metric ORFS (with a Mix of JIC just to keep ya on your toes). Cannot believe that there is not a reference out there on the internet of standards for this connectors. I'm sure I can get on the phone to various suppliers on Tuesday and get some answers, but can't believe these is no reference out there. Any links anyone? Thanks, brian
PS - the fitting I'm having trouble identifying is a face o-ring with an approx. outside diameter on the male threads of .807 inches. Might correspond to a loose 21 mm, too thick to be a 20mm but nowhere near any fractional sizes and the 22mm x 1.5 die seems to confirm a 1.5 mm thread pitch. threads perfectly but obviously loose. thanks again, brian