Sae-as33514 -

The is a technical standard for a flareless tube connection fitting end, commonly used in aerospace hydraulic and fuel systems to ensure leak-proof seals under high pressure.

Unlike traditional flared fittings, flareless designs do not require the tube end to be flared outwards. Instead, they use a precision sleeve (ferrule) that compresses against the tube's outer diameter to create a seal.

Note for modern system development: Per technical guidelines, the standard was declared "Inactive for New Design" starting in July 2008. It remains critical for legacy procurement, maintenance, repair, and overhaul (MRO) activities, and ongoing Department of Defense contracts. Technical Specifications and Design Overview sae-as33514

For the most recent revisions and specific dimensional tables, you can access the official documentation through the SAE International Standard AS33514 Page . l Ti,..____T - Defense Logistics Agency Warning Banner

: Primarily focuses on 24-degree cone flareless fluid connections, often rated for systems up to 3000 psi . The is a technical standard for a flareless

To appreciate the importance of this standard, it helps to understand the connection method it governs. A flareless fitting creates a seal by compressing a sleeve (ferrule) between the fitting body and the tube, rather than relying on a flared tube end. This offers several advantages:

In aerospace, a lost identification mark can lead to incorrect wire termination, maintenance errors, or even an in-flight malfunction. provides the engineering community with a clear, testable, and enforceable standard for wire identification sleeves. and Tubing Assemblies :

This document is a reaffirmation of the older military specification MS33514 . While it was transitioned to an SAE standard, it remains mandatory for many Department of Defense (DoD) contracts.

Here is a story about the life of a fitting built to the AS33514 standard. The "Flareless" Hero of Flight 402

The standard has undergone multiple iterations managed by the SAE G-3 Committee on Aerospace Couplings, Fittings, Hose, and Tubing Assemblies :