When flaring aluminum tubing for AN fittings, what is the required flare angle?

The required flare angle when flaring aluminum tubing for AN (Army-Navy) fittings is indeed 37 degrees. This specific angle is essential for ensuring a proper seal when the flared end of the tubing connects with the AN fitting. A 37-degree flare provides the necessary surface contact area for a robust joint while minimizing stress on the aluminum material.

Using the standard angle ensures compatibility with other AN fittings and helps prevent leaks, which can be critical in aircraft applications where fluid integrity is paramount. The design of the AN flare fitting is specifically made to use this 37-degree angle, influencing how the fittings interact with the flare. Deviating from this specified angle can compromise the reliability and safety of fluid systems in aircraft. Hence, maintaining the standard of a 37-degree flare is crucial for proper assembly and operational safety in the aerospace industry.