The Swagelok Tube Fitting Advantage: The Two-Ferrule Design

The following is an excerpt from our Swagelok® Tube Fitting Advantage Webinar hosted by our Direct Sales Representative Andy Wright. 

Swagelok tube fittings famously have a two-ferrule design, a unique feature that provides unparalleled performance, reliability, and safety. 

Our tube fittings provide superior grip, gas seal, and vibration resistance. 

Two-Ferrule Design: Benefits of the Front Ferrule

From a design standpoint, a gas seal is achieved via the front ferrule. When the nut is turned one and a quarter turns from finger tight, which is our standard installation procedure, the front ferrule burnishes and polishes the body bevel and the tubing. This creates a gas seal to minimize the potential for leakage.

Two-Ferrule Design: Benefits of the Back Ferrule

Increased grip and vibration resistance are attributed to the back ferrule. 

If you look closely, you'll notice a little notch on the inside of the back ferrule. So, when the nut is pulled up one and a quarter turns, the back ferrule performs a "hinging and colleting" action.

Hinging and colleting enhances and increases the surface-to-surface contact with the back ferrule and the tubing. That's important because it gives us better tubing grip to eliminate blowouts. This grip is advantageous, for numerous reasons, over the typical "biting" action of other fittings that "bite" into the outer surface of a tube.

Tubing vibration is absorbed by the back ferrule and doesn't compromise the gas seal. Instead, it isolates the stress risers that can be formed on the front ferrule. 

Learn More 

To learn more about the Swagelok Tube Fitting Advantage and our two-ferrule technology, watch our full Swagelok Tube Fitting Advantage webinar, schedule a Tube Fitting Installation training session, or download our Tube Fitting brochure.