This SAE Aerospace Standard (AS) establishes the requirements for 37 degrees flared tube or machined cone fluid connection fittings (see Section 6) for use in all types of fluid systems.

Fittings shall be furnished in the types and styles designated by the applicable AN, AS, MS, NAS, or other engineering standard drawings. This specification is the same as MIL-F-5509 as applicable to 37 degrees flared tube 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.