Double Ferrules Union Tee: High-Integrity 3-Way Connector

Create reliable, leak-free branch connections in your critical fluid systems. The Stark Double Ferrules Union Tee is engineered to provide a secure, full-flow distribution point without the need for welding or threaded pipe. Ideal for instrumentation loops, sampling points, and high-density distribution lines, our one-piece forged 316/316L stainless steel tees deliver robust, vibration-resistant performance, ensuring system integrity from every port.

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✓ One-Piece Forged Body | ✓ 20+ Reassembly Cycles | ✓ Zero-Leak Performance Guarantee

🔧 Find Your Tee Size in 3 Clicks

Select Your System: ○ Imperial (Fractional) ○ Metric

🔥 Most Popular Sizes (In Stock - Same Day Shipping)

1/4" Tee	3/8" Tee	1/2" Tee	6mm Tee	12mm Tee
SS-UT-FT4	SS-UT-FT6	SS-UT-FT8	SS-UT-MT6	SS-UT-MT12
[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]

Part Number Format: [Material]-UT-[Size] (e.g., INC625-UT-FT4)

(UT = Union Tee)

(FT / MT = Sizing System (Fractional Tube / Metric Tube))

🛠 The Engineering Advantage

Superior Strength with One-Piece Forging: Unlike welded or multi-piece tees, our one-piece forged construction eliminates grain-structure weak points. This provides maximum integrity to withstand pressure surges and external mechanical stress.

Balanced Flow Dynamics: Internal passages are precision-machined to ensure smooth, laminar flow. By minimizing turbulence at the branch point, we reduce pressure drop and maintain consistent sensor readings.

Anti-Galling Silver-Plated Nuts: Every nut is internally silver-plated as standard. This acts as a permanent solid lubricant, preventing thread seizing (galling) and ensuring the fitting can be reliably reassembled 20+ times.

Guaranteed Interchangeability: Fully compatible with Swagelok® and Parker A-LOK® union tees, making Stark the ideal choice for MRO, system expansions, or high-performance new builds.

📈 Technical Specifications & Flow Data

Feature	Stark Standard Specification	Optional Advanced Upgrades
Material Grade	Forged 316/316L Stainless Steel	Duplex 2205, Super Duplex 2507, Inconel 625, Hastelloy C276, Monel 400, etc.
Pressure Rating	Up to 10,000 PSI (689 bar)	Custom High-Pressure Configurations
Testing	100% Pneumatic Tested at 1.1x WP	Helium Leak Testing (1 x 10⁻⁹ sccs)
Compliance	MTR to EN 10204 3.1 & PMI Verified	NACE MR0175 / NORSOK M-650

Flow Coefficient ($C_v$) Data

Precise flow data for engineers designing analytical or distribution manifolds:

Tube O.D.	Max Pressure (PSI)	Straight Cv	Branch Cv	Center-to-End (in)
1/4"	10,200	0.40	0.35	1.06
3/8"	7,500	1.10	0.90	1.31
1/2"	6,700	2.10	1.70	1.56
3/4"	5,000	5.30	4.20	2.00

🎯 Head-to-Head Comparison

Feature	Standard Commodity Tees	The Stark Forged Tee
Construction	Often welded/cast (weak joints)	One-Piece Forged Body (High Safety)
Thread Life	Prone to galling after 3 remakes	Silver-Plated Standard (20+ Remakes)
Flow Efficiency	Rough-drilled (high turbulence)	Precision Machined (Laminar Flow)
Traceability	Often incomplete MTRs	Full MTR + PMI Verification

📌 Targeted Application Support

Analytical Instrumentation: Secure take-off points for pressure gauges, transmitters, and chromatography sensors.

Hydrogen Energy: Specialized 316SS with optimized nickel content to mitigate hydrogen embrittlement in H2 refueling stations.

AI Liquid Cooling: Reliable 3-way distribution manifolds for high-density server cooling loops.

Chemical Injection: Distributing additives across process streams with zero risk of cross-contamination.

❓ Frequently Asked Questions (FAQ)

Q1: Why is a forged body essential for a tee?

A forged body provides a continuous grain structure, making it much more resistant to the fatigue and vibration that often causes welded or cast tees to fail at the junction point.

Q2: Can I use this tee to connect different tube sizes?

Our standard Union Tee connects three tubes of the same size. For branching to smaller lines, please see our Reducing Union Tee section or contact us for custom configurations.

Q3: How do you ensure the ports on the tee are perfectly aligned?

Our manufacturing process utilizes high-precision CNC machining with strict geometric tolerance controls. This ensures that all three ports are perfectly aligned for a stress-free connection and a professional-looking installation.

📦 Complete Size & Cross-Reference Chart

Imperial Sizes (Fractional)

Size	Stark Part No.	Swagelok® Ref	Parker A-LOK® Ref
1/16"	SS-UT-FT1	SS-100-3	1ET1
1/8"	SS-UT-FT2	SS-200-3	2ET2
3/16''	SS-UT-FT3	SS-300-3	3ET3
1/4"	SS-UT-FT4	SS-400-3	4ET4
5/16''	SS-UT-FT5	SS-500-3	5ET5
3/8"	SS-UT-FT6	SS-600-3	6ET6
1/2"	SS-UT-FT8	SS-810-3	8ET8
5/8''	SS-UT-FT10	SS-1010-3	10ET10
3/4"	SS-UT-FT12	SS-1210-3	12ET12
7/8''	SS-UT-FT14	SS-1410-3	14ET14
1"	SS-UT-FT16	SS-1610-3	16ET16
1-⅛''	SS-UT-FT18	SS-1810-3	18ET18
1-¼''	SS-UT-FT20	SS-2000-3	20ET20
1-½''	SS-UT-FT24	SS-2400-3	24ET24

Metric Sizes

Size	Stark Part No.	Swagelok® Ref	Parker A-LOK® Ref
2mm	SS-UT-MT2	SS-2M0-3	ETM2
3mm	SS-UT-MT3	SS-3M0-3	ETM3
4mm	SS-UT-MT4	SS-4M0-3	ETM4
6mm	SS-UT-MT6	SS-6M0-3	ETM6
8mm	SS-UT-MT8	SS-8M0-3	ETM8
10mm	SS-UT-MT10	SS-10M0-3	ETM10
12mm	SS-UT-MT12	SS-12M0-3	ETM12
14mm	SS-UT-MT14	SS-14M0-3	ETM14
15mm	SS-UT-MT15	SS-15M0-3	ETM15
16mm	SS-UT-MT16	SS-16M0-3	ETM16
18mm	SS-UT-MT18	SS-18M0-3	ETM18
20mm	SS-UT-MT20	SS-20M0-3	ETM20
22mm	SS-UT-MT22	SS-22M0-3	ETM22
25mm	SS-UT-MT25	SS-25M0-3	ETM25
28mm	SS-UT-MT28	SS-28M0-3	ETM28
30mm	SS-UT-MT30	SS-30M0-3	ETM30
32mm	SS-UT-MT32	SS-32M0-3	ETM32
38mm	SS-UT-MT38	SS-38M0-3	ETM38

💬 Still Have Questions?

[Chat with an Engineer] [Email Us: sales@starkvalve.com] [Call Us: +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.