Double Ferrules Bulkhead Union Fitting: Secure Panel-Mount Connector

Create a secure, stationary anchor point for your tube lines. The Stark Double Ferrules Bulkhead Union is engineered to allow a tube to pass through a panel, enclosure wall, or bracket, providing a leak-tight seal on both sides. Its robust, one-piece forged 316/316L stainless steel body and heavy-duty panel nut ensure a vibration-resistant connection, protecting your tube lines from external mechanical stress and simplifying system maintenance.

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✓ One-Piece Forged Body| ✓ Protects Tubing from Stress| ✓ Zero-Leak Performance Guarantee

🔧 Find Your Bulkhead Union 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-BU-FT4	SS-BU-FT6	SS-BU-FT8	SS-BU-MT12
[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]

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

(BU = Bulkhead Union)

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

🛠 The Engineering Advantage

Protects System Integrity with a Fixed Anchor Point: By securely mounting the tube line to a panel, the bulkhead union isolates the internal connections from external forces, vibration, and accidental movement, significantly enhancing the long-term reliability of your entire system.

Superior Strength with One-Piece Forging: Unlike multi-piece designs, our monolithic forged body provides maximum resistance to installation torque and operational stress, ensuring a robust and secure panel-mount connection.

Guaranteed Interchangeability: Fully compatible with Swagelok® and Parker A-LOK® bulkhead unions, allowing for confident MRO replacements and seamless integration into existing panel layouts without modification.

Reliable Reassembly with Anti-Galling Nuts: Every nut is internally silver-plated as a standard feature. This prevents thread seizing (galling) and ensures the tube connections can be reliably disassembled and reassembled 20+ timesfor maintenance or system changes.

📈 Technical Specifications

Feature	Stark Standard Specification	Optional Advanced Upgrades
Body Material	Forged316/316L Stainless Steel	Duplex 2205, Super Duplex 2507, Inconel 625, Hastelloy C276, Monel 400, etc.
Includes	Fitting Body, Panel Nut, 4x Ferrules (2 sets), 2x Nuts	Matching high-alloy ferrules and nuts
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

🎯 Why Choose a Stark Bulkhead Union? A Head-to-Head Comparison

Feature	Using a Standard Union + Clamps	Using One Stark Bulkhead Union
Panel Seal	⚠️ None (Requires separate grommet)	✅ Integrated Sealing Face
Vibration Resistance	❌ Low (Stress transfers to tubing)	✅ Superior (Isolates stress at the panel)
Installation Time	❌ High (Requires multiple components)	✅ Low (Single component installation)
Professional Look	⚠️ Messy, unprofessional	✅ Clean, Professional, Engineered Finish

📌 Targeted Application Support

Instrumentation Panels & Cabinets: The primary application for creating clean, secure entry and exit points for tube lines.

System Interfaces: Provides a fixed connection point on the wall of a machine or process skid for external customer connections.

Sample Stations: Used to create robust connection points for sample lines passing through an analysis panel.

Vehicle & Marine Applications: Ideal for routing hydraulic, fuel, or pneumatic lines through bulkheads and firewalls.

❓ Frequently Asked Questions (FAQ)

Q1: What is the main purpose of a bulkhead union?

Its main purpose is to provide a secure anchor point where a tube line passes through a wall or panel. This protects the tubing from mechanical stress and vibration, simplifies system maintenance by creating a fixed disconnection point, and provides a clean, professional finish.

Q2: What information do I need to specify a bulkhead union?

You need to know three things: the tube O.D.(e.g., 1/4" or 6mm), the material(e.g., 316SS), and the maximum thickness of the panel it needs to pass through to ensure the body has sufficient length.

Q3: How does the panel nut work?

The bulkhead union body has a continuous thread. It is inserted through a hole in the panel, and the panel nut is tightened from the other side, clamping the fitting securely against the panel wall.

Q4: Can this fitting be used to connect different tube sizes?

Our standard Bulkhead Union connects two tubes of the same size. However, we offer Bulkhead Reducing Unions that allow you to connect tubes of different diameters through a panel. Please contact our technical support for available size combinations.

📦 Complete Size & Cross-Reference Chart

Need a custom configuration or reducing union?[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.