This standard defines the dimensions and tolerances for the port end of inch series pipe couplings,37°, for aerospace applications. Matched fluid system component shall have a port connection in accordance with EN 4550-3.
AECMA PREN 4340-1997 history
1997AECMA PREN 4340-1997 Aerospace Series Magnesium Alloy MG-W68001 Filler Metal for Welding Wire and Rod Edition P 1