Definition
Permanent fluid-line fittings that are attached to a tube by compressing (swaging) the fitting tightly onto the tube using a special tool that squeezes the metal of the fitting and tube together to form a leak-proof, high-pressure connection. Once installed, they cannot be removed without cutting the tube.
Plain English
A type of fitting that is permanently squeezed onto the end of a metal tube to make a strong, leak-free joint. Once it's on, it stays on — you can't unscrew it.
Context Anchor
Seen in aircraft maintenance when inspecting, making, or replacing control cables and cable ends.
Derivation
From the verb 'to swage,' a metalworking term meaning to shape or compress metal using a tool or die. The fitting is literally squeezed into place, so the name describes the installation method.
Why Pilots Care
These connections carry critical loads in flight controls and fluid systems; a failed fitting can cause loss of control or system leakage.
Intuition Check
Do not think of a swaged fitting as a clamp that can be tightened later. It is a permanent pressed-on fitting; if it is wrong or damaged, it is replaced, not adjusted.
Example Sentence 1
The mechanic noted that the hydraulic line used swaged fittings, so the entire line would need to be replaced rather than repaired.
Example Sentence 2
During preflight, the pilot noticed a cracked swaged fitting on a brake line and grounded the aircraft for repair.