If you work in aerospace, defense, or any industry relying on high-performance fluid systems, you've likely encountered the need for secure, leak-proof tube fittings. stands as the definitive industry standard for precisely that purpose, providing the critical dimensions for a widely trusted method of connection: the flareless tube fitting.
If you touch aerospace electronics, treat AS33514 as mandatory training for your quality team. The investment is small. The cost of a missed counterfeit is not.
Establishes uniform dimensions for the "fitting end" (the portion of the fitting that mates with a tube or another component) to ensure interchangeability and reliable sealing without the need for flaring the tube.
Covers a wide range of tube sizes used in hydraulic and pneumatic systems. 2. Gasket Seal Design sae-as33514
In fluid systems, tubes carry liquids or gases under massive pressure. Traditional setups use a "flared" tube, meaning the end of the metal tube is stretched into a funnel shape.
The primary function of AS33514 is to provide a standardized interface for and gasket seals in aircraft fluid systems. Unlike traditional flared fittings that require the tube end to be mechanically spread, flareless fittings use a bite-type sleeve or a specific internal cone geometry to create a high-pressure seal. Key features of AS33514 include:
Technical Report: SAE-AS33514 Standards The is a critical aerospace standard that defines the dimensions and requirements for flareless tube connection fitting ends and gasket seals. It is widely used in high-pressure fluid systems, particularly in military and commercial aviation. 1. Scope and Purpose If you work in aerospace, defense, or any
Always consult the latest SAE specifications and your design requirements to ensure compliance for new projects. Summary Table: SAE-AS33514 Description Fitting End, Standard Dimensions (Flareless) Focus Flareless Tube Connection & Gasket Seal Industry Aerospace, Defense, High-Pressure Hydraulics Replaces MS33514 Military Standards Status Active, but Inactive for New Designs (since 2008)
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:
: Transferred and published by SAE in August 1998. The investment is small
SAE-AS33514, flareless fittings, aerospace hydraulic fittings, tube end fittings, AS33514 standard, aircraft fluid systems, SAE aerospace standard, hydraulic ferrule, UNJ threads, MIL-F-18280.
. While you will still find it in plenty of existing aircraft (maintenance and repair), engineers are now directed to use alternative standards for modern projects. This makes it a "legacy" standard—essential for keeping older planes in the air but a relic for the next generation of aerospace design. 3. Flareless vs. Flared: Why It Matters
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In the demanding world of aerospace engineering, hydraulic systems, and industrial fluid power, the integrity of tube connections is paramount. Leakage can lead to system failure, efficiency loss, or catastrophic safety incidents. is a critical, industry-standard specification governing the design and dimensions of flareless tube fitting ends and gasket seals, providing a standardized, high-performance solution for high-pressure applications.