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.

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✓ 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
[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]

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

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💬 Still Have Questions?

Our engineering team is ready to assist with technical selection, system design, or material recommendations.

[Chat with an Engineer] [Email: sales@starkvalve.com] [Call: +86-13917221881]

🔒 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.