This technical condition applies to HB5553~HB5585-83 cylindrical pipe connections. This type of connection is suitable for piping systems of aero-engines, and can also be used for piping systems of aircraft, missiles and their accessories.
HB 5552-1983 history
1970HB 5552-1983 Technical conditions for cylindrical type pipe joints
1970HB 5552-1981 Technical conditions for cylindrical pipe connectors