Tube Fittings
Double Ferrules Union Cross
High-pressure 4-port union cross. 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 Cross: 4-Port High-Integrity Connector
Create compact, reliable junction points in your complex fluid systems. The Stark Double Ferrules Union Cross is engineered to provide a secure, single-point connection for four tube lines, eliminating the need for multiple tee fittings and potential leak paths. Ideal for instrumentation manifolds, distribution circuits, and sampling systems, our one-piece forged 316/316L stainless steel crosses deliver robust, vibration-resistant performance across all four ports.
✓ One-Piece Forged Body| ✓ 20+ Reassembly Cycles| ✓ Zero-Leak Performance Guarantee
🔧 Find Your Cross Size in 3 Clicks
1. Select Your System:○ Imperial (Fractional) ○ Metric
🔥 Most Popular Sizes (In Stock - Same Day Shipping)
1/4" | 3/8" | 1/2" | 12mm |
SS-UC-FT4 | SS-UC-FT6 | SS-UC-FT8 | SS-UC-MT12 |
Part Number Format: [Material]-UC-[Size] (e.g., INC625-UC-FT4)
(UC = Union Cross)
(FT / MT = Sizing System (Fractional Tube / Metric Tube))
🛠 The Engineering Advantage
- Maximum Integrity with One-Piece Forging: Unlike fabricated crosses, our monolithic forged body provides a continuous grain structure. This eliminates welds and joint stress, offering the highest resistance to system pressure and vibration.
- Balanced Flow Dynamics: Internal passages are precision-machined to ensure smooth, balanced flow distribution across all four ports (e.g., Cv ≈ 0.35 per port for 1/4"), critical for consistent pressure in multi-line sensing applications.
- Anti-Galling Silver-Plated Nuts: Every nut features internal silver plating 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® (SS-400-4 series) and Parker A-LOK® (4ECR4 series), ensuring seamless integration into your existing infrastructure for MRO and system upgrades.
📈 Technical Specifications & Flow Data
Feature | Stark Standard Specification | Optional Advanced Upgrades |
Material Grade | Forged316/316L 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 (Cv) Date:
Tube O.D. | Straight Cv | Branch Cv |
1/4" | 0.40 | 0.35 |
3/8" | 1.10 | 0.90 |
1/2" | 2.10 | 1.70 |
🎯 Why Use a Stark Cross? A Head-to-Head Comparison
Feature | Using Two Standard Tees | Using One Stark Forged Cross |
Potential Leak Paths | ⚠️ 6 Connection Points | ✅ 4 Connection Points (33% Reduction) |
Installation Time | ❌ High (Requires 2 fittings, multiple steps) | ✅ Low (Single component installation) |
Space Requirement | ❌ Large, asymmetrical footprint | ✅ Compact, Symmetrical Design |
Structural Integrity | ⚠️ Lower, dependent on joints | ✅ Superior (Monolithic Forged Body) |
📌 Targeted Application Support
- Analytical Instrumentation: Create 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 station panels.
- AI Liquid Cooling: Build symmetrical distribution manifolds for balanced coolant flow in high-density server racks.
- Chemical Injection: Distribute additives across multiple process streams with zero risk of cross-contamination.
❓ Frequently Asked Questions (FAQ)
Q1: Why is a forged body essential for a cross fitting?
A forged, one-piece body provides a continuous grain structure, making it significantly more resistant to the pressure, fatigue, and vibration that can cause welded or multi-piece fittings to fail at the junction point.
Q2: Can I use this cross to connect different tube sizes?
Our standard Union Cross connects four tubes of the same size. For branching to different lines, please see our Reducing Union Cross section or contact our engineering team for custom configurations.
Q3: Can these be used for mixing different fluids?
While physically possible, mixing in a cross can create significant turbulence. For critical mixing applications, we strongly recommend consulting our engineering team to evaluate if a specialized manifold block is a more appropriate and efficient solution.
📦 Complete Size & Cross-Reference Chart
Imperial Sizes (Fractional)
Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
1/16" | SS-UC-FT1 | SS-100-4 | 1ECR1 |
1/8" | SS-UC-FT2 | SS-200-4 | 2ECR2 |
3/16'' | SS-UC-FT3 | SS-300-4 | 3ECR3 |
1/4" | SS-UC-FT4 | SS-400-4 | 4ECR4 |
5/16'' | SS-UC-FT5 | SS-500-4 | 5ECR5 |
3/8" | SS-UC-FT6 | SS-600-4 | 6ECR6 |
1/2" | SS-UC-FT8 | SS-810-4 | 8ECR8 |
5/8'' | SS-UC-FT10 | SS-1010-4 | 10ECR10 |
3/4" | SS-UC-FT12 | SS-1210-4 | 12ECR12 |
7/8'' | SS-UC-FT14 | SS-1410-4 | 14ECR14 |
1" | SS-UC-FT16 | SS-1610-4 | 16ECR16 |
Metric Sizes
Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
3mm | SS-UC-MT3 | SS-3M0-4 | ECRM3 |
4mm | SS-UC-MT4 | SS-4M0-4 | ECRM4 |
6mm | SS-UC-MT6 | SS-6M0-4 | ECRM6 |
8mm | SS-UC-MT8 | SS-8M0-4 | ECRM8 |
10mm | SS-UC-MT10 | SS-10M0-4 | ECRM10 |
12mm | SS-UC-MT12 | SS-12M0-4 | ECRM12 |
16mm | SS-UC-MT16 | SS-16M0-4 | ECRM16 |
18mm | SS-UC-MT18 | SS-18M0-4 | ECRM18 |
20mm | SS-UC-MT20 | SS-20M0-4 | ECRM20 |
22mm | SS-UC-MT22 | SS-22M0-4 | ECRM22 |
25mm | SS-UC-MT25 | SS-25M0-4 | ECRM25 |
💬 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, endorsed by, or sponsored by these companies. Part numbers and brand names are provided for cross-reference and compatibility purposes only.