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Ferrule fittings are essential components in fluid and gas systems, ensuring leak-proof, vibration-resistant, and reliable connections across a wide range of industries. Whether you’re working with compressed gases, chemicals, steam, or cleanroom fluids, understanding how ferrule fittings work—and how to select and install them properly—is critical.
In this guide from Perfect Engineers, we explain everything you need to know about ferrule fittings, their types, materials, working principles, applications, and best practices.
Ferrule fittings, also called compression fittings, are mechanical connectors used to join tubes in fluid systems. They provide a metal-to-metal seal using one or two ferrule rings compressed between a nut and the fitting body.
When properly installed, ferrule fittings offer leak-tight, high-pressure, and corrosion-resistant performance without welding or threading the tube.
Ferrule fittings function using a three-part mechanism:
When the nut is tightened, the front ferrule creates the seal while the back ferrule grips the tube. This dual action ensures vibration resistance and prevents tube blowout.
| Feature | Single Ferrule | Double Ferrule (PE-LOCK) |
|---|---|---|
| Number of ferrules | One | Two (front + back) |
| Sealing mechanism | Combined seal & grip | Sealing and gripping split function |
| Vibration resistance | Moderate | High |
| Reusability | Lower | Excellent |
| Pressure tolerance | Up to ~6,000 PSI | Up to 10,000 PSI |
| Applications | Low to medium pressure | Critical sealing, high-pressure |
| Industry | Application |
|---|---|
| Oil & Gas | Analyzer panels, gas skids, sample lines |
| Pharmaceutical | WFI, clean steam, nitrogen, buffer transfers |
| Marine & Offshore | Fuel, seawater cooling, firewater, deck lines |
| Power Generation | Superheated steam, turbine instrumentation |
| Semiconductor | UHP gases, vacuum, cleanroom tubing |
| Aerospace & Cryogenic | LOX, LH₂, O₂, N₂ gas lines |
| Food & Beverage | CO₂ lines, clean air, flavor dosing systems |
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Yes. PE-LOCK fittings are 100% dimensionally and functionally interchangeable.
Yes. Double ferrule fittings offer excellent vibration resistance.
Yes. We offer oxygen-cleaned SS316L and brass fittings per international gas safety standards.
Up to 10,000 PSI, depending on size, material, and temperature.
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