In aerospace, defense, and hydraulic systems, two cold-working tube fitting technologies dominate the field: Permaswage® and Rynglok®. These permanent and semi-permanent solutions are trusted worldwide to provide leak-proof, high-pressure connections in mission-critical systems.
Whether you’re sourcing components like the DLT40PSHA3016 swage head or researching Rynglok repair kits, this guide covers everything you need to know — with real part numbers and technical specs to help you make informed decisions.
What Is a Permaswage System?
Permaswage is a cold-swaging technology that permanently joins tubes and fittings using hydraulic pressure—eliminating the need for threaded or welded joints. This creates a high-strength, leak-free seal ideal for aerospace and military applications.
Common Permaswage Head Assemblies:
DLT10PSHA3006 – For 3/8” tubing, 3,000 psi systems
DLT20PSHA3010 – For 5/8” tubing, standard Permaswage use
DLT30PSHA3012 – Used on 3/4” tubing, compatible with DLT30 series dies
DLT40PSHA3016 – Popular 1” head for high-demand installations
DLT40PSHA4016 – Variant for 4,000 psi aluminum fitting swagingPermaswage Head Assy In…
These part numbers correspond to DLT Series Swage Head Assemblies, which are visually and dimensionally inspected
Rynglok Tube Repair Systems Rynglok® is a semi-permanent tube fitting technology designed for quick repairs or field retrofits. Unlike Permaswage, Rynglok uses a mechanical locking ring to secure the fitting. It's commonly used in MRO (maintenance, repair, and overhaul) situations, especially when full system teardown is impractical.
Rynglok Advantages:
Field-repairable (ideal for AOG situations)
Minimal tooling required
DOT-approved for specific applications
Fast installation
Popular Rynglok Repair Kits:
RFT1020-06 – 3/8” tube size kit with collar, sleeve, and ring
RFT2025-10 – 5/8” tube Rynglok repair fitting set
RFT3032-12 – 3/4” Rynglok field-repair assembly
These kits allow technicians to restore system integrity without swaging or welding, making them a go-to solution for commercial and military aircraft repairs.
Comparing Permaswage vs. Rynglok
Feature Permaswage® Rynglok® Type Permanent swaged fitting Semi-permanent mechanical connection PSI Rating Up to 10,000 psi Up to 3,000 psi (varies) Ideal Use OEM & high-pressure applications Field repair & retrofit Tooling Required Hydraulic swage head + pump Hand tool or pneumatic installation tool Reusability Non-reusable Semi-reusable depending on configuration
Optimize Tooling and Inspections
To ensure proper performance, Permaswage heads such as the DLT20PSHA3010, DLT40PSHA3020, and dies like DLT10PSDI3005 should be inspected regularly. Visual and dimensional checks include:
Matching die halves by serial number
Checking die slot compression and wear limitsPermaswage Head Assy In…
For detailed inspection procedures, refer to the manual, which outlines proper use, maintenance, and certification requirements.
Final Thoughts Whether you need a DLT05PSHA3004 for a 1/4” line or a complete Rynglok repair kit, choosing the right system is critical to long-term system reliability.
Shop Swage Tools & Kits Online Looking for in-stock Permaswage tooling or Rynglok repair kits? Top Flight Tools offers a wide inventory of certified surplus and factory-new tools — with fast shipping and expert support.
⚠️ Disclaimer: Top Flight Tools (TFT) is an independent reseller and is not affiliated with, sponsored by, or endorsed by Eaton®, Eaton Aerospace®, Rynglok®, Aeroquip®, Permaswage®, Deutsch Metal Components®, DMC®, or Precision Castparts Corp® (PCC Fasteners). Permaswage® is a registered trademark owned by Precision Castparts Corp®. All product names, trademarks, and registered trademarks are the property of their respective owners. Any reference to Eaton Rynglok®, Aeroquip®, Permaswage®, or DMC® products, specifications, or part numbers is provided for informational and compatibility purposes only. All trademarks and part numbers remain the property of their respective companies. TFT assumes no responsibility for the misuse of this information or any misrepresentation of affiliation.