Tube Fittings
90° Double Ferrules Union Elbow
High-pressure 90° Union Elbow: Forged 316SS body for maximum strength. Swagelok & Parker compatible. Zero-leak performance to 10,000 PSI. 24h quote!
90° Double Ferrules Union Elbow: High-Integrity Directional Connector
Eliminate structural weak points in your system's directional changes. The Stark 90° Double Ferrules Union Elbow is engineered for critical fluid and gas systems where space is limited and zero-leakage is non-negotiable. Our one-piece forged design delivers a robust mechanical grip, ensuring long-term system stability under extreme pressure and vibration.
✓ 24h Engineering Support | ✓ Forged Body for Maximum Safety | ✓ Zero-Leak Guarantee
🔧 Find Your Elbow Size in 3 Clicks
Select your system: ○ Imperial (Fractional) ○ Metric
🔥 Most Popular Elbow Sizes (In Stock - Same Day Shipping)
1/4" Elbow | 3/8" Elbow | 1/2" Elbow | 6mm Elbow | 12mm Elbow |
SS-UE-FT4 | SS-UE-FT6 | SS-UE-FT8 | SS-UE-MT6 | SS-UE-MT12 |
Part Number Format: [Material]-UE-[Size] (e.g., INC625-UE-FT4)
(UE = Union Elbow)
(FT / MT = Sizing System (Fractional Tube / Metric Tube))
🛠 The Engineering Advantage
- One-Piece Forged Body: Our forging process ensures a continuous grain structure, providing superior resistance to fatigue and stress corrosion compared to welded or cast alternatives.
- Full-Flow Internal Geometry: Precision-machined internal radius minimizes turbulence and pressure drop, maintaining system efficiency through every 90° turn.
- Anti-Galling Silver-Plated Nuts: Internal threads are silver-plated as standard to prevent seizing (galling), allowing for reliable high-torque installation and repeated reassembly.
- Optimized Compatibility: Fully dimensionally and functionally interchangeable with Swagelok® and Parker A-LOK®—perfect for MRO and system upgrades.
📈 Technical Specifications & Flow Data
Feature | Stark Standard Specification | Application Advantage |
Material | Forged 316/316L Stainless Steel | Maximum grain strength at directional changes |
Pressure Rating | Up to 10,000 PSI (689 bar) | High safety factor for extreme service |
Testing | 100% Pneumatic Tested at 1.1x WP | Guaranteed leak-free out of the box |
Compliance | EN 10204 3.1 MTR & PMI Verified | 100% Material traceability |
Flow Coefficient (Cv) & Center-to-End Data
Tube O.D. | Max Pressure (PSI) | Cv (Flow Coefficient) | Center-to-End (in) |
1/4" | 10,200 | 0.35 | 1.06 |
3/8" | 7,500 | 0.90 | 1.31 |
1/2" | 6,700 | 1.70 | 1.56 |
3/4" | 5,000 | 4.20 | 2.00 |
📌 Targeted Application Support
- Instrumentation Panels: The compact design is ideal for routing tubing in dense control panels and cabinets.
- Process Skids & Modules: Provides robust, vibration-resistant 90° connections for modular process systems.
- Hydraulic Systems: High-pressure rating makes it suitable for hydraulic lines requiring directional changes.
- R&D and Laboratory Gas Lines: Delivers leak-tight performance for critical gas delivery systems.
🎯 Head-to-Head Comparison
Feature | Standard Cast/Welded Elbows | Stark Forged Union Elbow |
Construction | Potential weak points at joints | One-Piece Forged Body (Superior Strength) |
Thread Protection | None (Prone to galling/seizing) | Silver-Plated Standard (Anti-Galling) |
Leak Integrity | Standard bubble-tight | Helium-Leak Tested (<10⁻⁹ sccs) |
Reassembly | 3-5 times before failure | 20+ Cycles with No Degradation |
❓ Frequently Asked Questions (FAQ)
Q1: Is a forged elbow really stronger than a welded one?
Yes, significantly. The forging process creates a continuous grain structure that is inherently stronger and more resistant to fatigue and stress corrosion cracking than a weld joint, which can be a point of weakness.
Q2: Are Stark elbows truly interchangeable with Swagelok®?
Yes. They are manufactured to the same critical dimensional standards (e.g., Swagelok® SS-400-9 series), ensuring safe intermixing for maintenance and repair.
Q3: Can I use these in high-vibration applications?
Absolutely. The combination of a forged body and dual-ferrule design provides exceptional resistance to mechanical vibration, ideal for pumps and compressors.
📦 Complete Size & Cross-Reference Chart (Flat List)
Fractional Sizes (Imperial)
Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
1/16" | SS-UE-FT1 | SS-100-9 | 1EE1 |
1/8" | SS-UE-FT2 | SS-200-9 | 2EE2 |
3/16'' | SS-UE-FT3 | SS-300-9 | 3EE3 |
1/4" | SS-UE-FT4 | SS-400-9 | 4EE4 |
5/16'' | SS-UE-FT5 | SS-500-9 | 5EE5 |
3/8" | SS-UE-FT6 | SS-600-9 | 6EE6 |
1/2" | SS-UE-FT8 | SS-810-9 | 8EE8 |
5/8'' | SS-UE-FT10 | SS-1010-9 | 10EE10 |
3/4" | SS-UE-FT12 | SS-1210-9 | 12EE12 |
7/8'' | SS-UE-FT14 | SS-1410-9 | 14EE14 |
1" | SS-UE-FT16 | SS-1610-9 | 16EE16 |
1-⅛'' | SS-UE-FT18 | SS-1810-9 | 18EE18 |
1-¼'' | SS-UE-FT20 | SS-2000-9 | 20EE20 |
1-½'' | SS-UE-FT24 | SS-2400-9 | 24EE24 |
Metric Sizes
Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
2mm | SS-UE-MT2 | SS-2M0-9 | EEM2 |
3mm | SS-UE-MT3 | SS-3M0-9 | EEM3 |
4mm | SS-UE-MT4 | SS-4M0-9 | EEM4 |
6mm | SS-UE-MT6 | SS-6M0-9 | EEM6 |
8mm | SS-UE-MT8 | SS-8M0-9 | EEM8 |
10mm | SS-UE-MT10 | SS-10M0-9 | EEM10 |
12mm | SS-UE-MT12 | SS-12M0-9 | EEM12 |
14mm | SS-UE-MT14 | SS-14M0-9 | EEM14 |
15mm | SS-UE-MT15 | SS-15M0-9 | EEM15 |
16mm | SS-UE-MT16 | SS-16M0-9 | EEM16 |
18mm | SS-UE-MT18 | SS-18M0-9 | EEM18 |
20mm | SS-UE-MT20 | SS-20M0-9 | EEM20 |
22mm | SS-UE-MT22 | SS-22M0-9 | EEM22 |
25mm | SS-UE-MT25 | SS-25M0-9 | EEM25 |
28mm | SS-UE-MT28 | SS-28M0-9 | EEM28 |
30mm | SS-UE-MT30 | SS-30M0-9 | EEM30 |
32mm | SS-UE-MT32 | SS-32M0-9 | EEM32 |
38mm | SS-UE-MT38 | SS-38M0-9 | EEM38 |
💬 Still Have Questions?
Our engineering team is ready to assist with technical selection, system design, or material recommendations.
🔒 Disclaimer
Swagelok® and Parker A-LOK® are registered trademarks of their respective holders. Stark is not affiliated with these companies. Part numbers are for cross-reference only.