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.

[Request a Quote in 24h] [Apply for Free Samples]

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

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

Need a custom configuration?[Request Custom Configuration]

💬 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, endorsed by, or sponsored by these companies. Part numbers and brand names are provided for cross-reference and compatibility purposes only.