Permaswage® 3,000 PSI Tube Fittings have become one of the most trusted permanent tube connection systems in the aerospace industry. Designed for commercial aviation, military aircraft, helicopters, and other high-pressure fluid systems, these fittings provide a permanent, leak-free connection capable of withstanding vibration, pressure cycling, and harsh operating environments.
Unlike traditional flared tube fittings, Permaswage® fittings are permanently attached to the tubing using a hydraulic swaging process. This creates a strong mechanical connection without welding, brazing, or flaring, making the system ideal for critical aerospace hydraulic, fuel, pneumatic, lubrication, and environmental control systems.
Today, Permaswage® fittings are installed on thousands of commercial and military aircraft worldwide and continue to be the preferred choice for permanent tube connections where reliability is critical.
In this guide, we'll explain how Permaswage® fittings work, review the different fitting families, discuss common aerospace applications, and help you identify the correct fitting series for your installation.
What Are Permaswage® Tube Fittings?Permaswage® tube fittings are permanent mechanical fittings designed to be hydraulically swaged onto rigid tubing. During installation, a specially designed swage head and swage die compress the fitting uniformly around the outside diameter of the tube, creating a permanent metal-to-metal attachment.
Because the fitting becomes a permanent part of the tubing, the finished assembly offers exceptional vibration resistance, fatigue performance, and leak-free reliability. The system has been used throughout the aerospace industry for decades and is approved on numerous commercial and military aircraft platforms.
The Permaswage® 3,000 PSI product line supports tubing sizes from 3/16 inch (-03) through 1-1/2 inch (-24), allowing engineers to design complete fluid systems using a common installation method.
Why Choose Permaswage® Fittings?There are several reasons why aerospace manufacturers and maintenance organizations continue to rely on Permaswage® permanent tube fittings.
- Permanent leak-free tube connections
- No tube flaring required
- Excellent vibration resistance
- Outstanding fatigue performance
- Fast field installation
- Reduced maintenance requirements
- Proven aerospace reliability
- Wide range of fitting configurations
When installed using the proper Permaswage® tooling and installation procedures, these fittings provide years of dependable service in demanding aerospace environments.
Permaswage® Fitting FamiliesPermaswage® manufactures numerous fitting configurations to accommodate virtually every tube routing requirement encountered in aerospace fluid systems.
| Fitting Family | Series | Primary Application |
|---|---|---|
| Union | D10363 / D10136 | Straight tube-to-tube connection |
| Union Reducer | D10045 | Connecting different tube sizes |
| 90° Elbow | D10256 / D10258 | 90-degree directional change |
| 90° Elbow Reducer | D10355 / D10356 | Direction change with size reduction |
| Tee | D10559 / D10155 | Three-way fluid routing |
| Tee Reducer | D10023 / D10223 | Three-way connection with reduced branch |
| Cross | D10564 / D10254 | Four-way fluid routing |
| Cross Reducer | D10313 / D10213 | Four-way mixed-size connection |
| Bulkhead Union | D10164 | Passing tubing through structural panels |
| Bulkhead Flange | Various Series | Structural and welded bulkhead installations |