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It is from SAE Flange port ends to pipe or tube by welding connections; Two types of connecting tubes and pipes to 4 bolt flange port, one is socket welding for tubes (SAE socket weld flange), another one is butt welding for pipes(SAE butt weld flange); Two working pressure types, have SAE code 61 weld flange and SAE code 62 weld flange; Type of SAE flange welding couplings have SAE O-ring weld flange and SAE counter weld flange.
Overviews Catalog of SAE Weld Flange