AS33514 connections rely on a —typically an O-ring—placed in a specially designed groove at the base of the threads to ensure a positive seal against the port. 3. Material and Finish
SAE-AS33514: A Guide to Aerospace Flareless Tube Fittings is an aerospace standard that defines the dimensions and requirements for male flareless tube fitting ends used in fluid systems. Originally developed for military applications under the designation MS33514 , the standard was transitioned to SAE International to ensure continued maintenance and relevance in the modern aerospace industry. Core Technical Purpose
is an aerospace standard that specifies the dimensions and design requirements for flareless tube connection fitting ends and gasket seals. It is a critical specification for ensuring the compatibility and performance of fluid systems, particularly in military and defense applications where it was originally adopted from military specifications. Status and Supersession
: Components are typically rated for extreme temperature ranges, often from -65 °F to +275 °F (-54 °C to 135 °C), making them suitable for both military and commercial aviation platforms like the F-15, F-16, and C-17. Standard Status and Alternatives sae-as33514
– Deducted points for oxygen inefficiency and gauge readability in some installations. Recommended for its intended niche.
: Published in April 2019, it serves as the active technical standard for managing existing inventory and operational retrofits.
Kael looked at the massive, four-ton communications satellite hovering in the void above him. It was tethered to the orbital yard by three massive chains, each link as thick as a man's torso. The strain indicators on his HUD were glowing amber. The satellite was pulling hard, agitated by the gravitational flux of Jupiter nearby. Status and Supersession : Components are typically rated
Even the best fitting will fail if installed incorrectly. The standard implies (and maintenance manuals explicitly require) the following steps:
: The standard dictates critical measurements for concentricity, squareness, and surface roughness to prevent leaks under extreme vibration or pressure.
: Incremental improvements made to dimensions, testing clarity, and drafting style. How Flareless Connections Work As of
But what exactly is SAE-AS33514? Why is it referenced in countless aircraft blueprints and repair manuals? This article provides a deep dive into the standard—its history, technical requirements, applications, and the critical role it plays in modern aviation.
The standard stays active through regular updates, such as the , to confirm it fits modern manufacturing needs. How Flareless Connections Work
As of , SAE AS33514 was designated as inactive for new designs . While it remains widely used for the maintenance and repair of existing aircraft, new aerospace projects are generally directed toward alternative standards:
: Transferred and published by SAE in August 1998.
connections. Instead of widening the end of the tube, these fittings often use a "bite-type" sleeve or a gasket seal to create a leak-proof joint. saemobilus.sae.org Weight Savings: