Tube Fittings
Double Ferrules Union Tee
High-pressure 3-port union tee. Forged 316SS body for balanced flow distribution. Swagelok & Parker A-LOK compatible. Silver-plated nuts for 20+ remake cycles. Quote in 24h!
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.
✓ 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 |
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?
🔒 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.