This SAE Aerospace Standard (AS) establishes the requirements for fluid fittings that combine both 37 degree flared and pipe threaded connections for use in all types of fluid systems. Classification Fittings shall be furnished in the types and styles designated by the applicable AN@ AS@ MS@ NAS@ and other engineering standard drawings. This specification is the same as MIL-F-5509 as applicable to 37 degree flared to pipe threaded fittings except for updated materials and process specifications and industry coordinated general improvements. It is intended to serve as a procurement specification for the fittings described herein and in Section 6.