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Swagelok Bulkhead Unions

Swagelok Bulkhead Unions

Swagelok Bulkhead Unions: Secure Panel-Mounted Tube Connections for Gas and Fluid Systems

Swagelok Bulkhead Unions from TFM are designed for connecting two lengths of tubing through a wall, panel, or bulkhead. These fittings feature Swagelok’s proven dual-ferrule compression technology, ensuring leak-proof, torque-free seals across both tube ends while maintaining structural integrity at the mounting surface. Ideal for applications requiring gas-tight or fluid-tight transitions through barriers, these bulkhead unions are used extensively in instrumentation panels, vacuum enclosures, process skids, and analytical equipment.

Each Swagelok Bulkhead Union includes a threaded mounting body and locknut, allowing the fitting to be securely positioned through a panel while maintaining tubing alignment on both sides.

Key Features of Swagelok Bulkhead Unions:

  • Leak-Proof, Torque-Free Seals
    The Swagelok connection on both sides forms reliable, gas-tight tube seals without the need for excessive torque, promoting repeatable performance and reducing mechanical stress.

  • Cost-Effective Leak Prevention
    Designed to eliminate leaks in critical systems, these fittings enhance process reliability, reduce safety risks, and help avoid costly downtime caused by leakage or misalignment.

  • Material Selection for Specific Media

    • Stainless Steel Bulkhead Unions: Ideal for gas handling systems, UHV setups, or corrosive environments.

    • Brass Bulkhead Unions: Best suited for water systems or general industrial fluid handling applications.

  • Panel or Enclosure Mounting Capability
    The bulkhead thread and locknut enable secure fitting placement through metal panels, vacuum walls, or box enclosures—ensuring proper strain relief and tubing support.

  • Precision Machined Components
    Manufactured to tight tolerances, Swagelok Bulkhead Unions are designed for fractional and metric tubing sizes, with smooth assembly and consistent performance across multiple reuses.

Applications:

  • Vacuum chamber or glovebox wall tubing pass-through

  • Instrumentation and process control panel layouts

  • Gas distribution lines in cleanrooms or analytical labs

  • Cooling water lines routed through enclosure walls

  • Custom-built skid systems or modular piping assemblies

TFM also offers a wide range of Swagelok-compatible components, including elbows, tees, male/female NPT adapters, and weld-end fittings, giving you the flexibility to build a complete, high-integrity fluid or gas distribution system.

Ordering Table

Reference Material Tube OD 1 Pipe Size Part Number
Swagelok to Male NPT Adapter Stainless Steel 1/8" 1/8" SS-200-1-2
Swagelok to Male NPT Adapter Stainless Steel 1/8" 1/4" SS-200-1-4
Swagelok to Male NPT Adapter Stainless Steel 1/4" 1/8" SS-400-1-2
Swagelok to Male NPT Adapter Stainless Steel 1/4" 1/4" SS-400-1-4
Swagelok to Male NPT Adapter Stainless Steel 3/8" 1/8" SS-600-1-2
Swagelok to Male NPT Adapter Stainless Steel 3/8" 1/4" SS-600-1-4
Swagelok to Male NPT Adapter Brass 1/4" 1/8" B-400-1-2
Swagelok to Male NPT Adapter Brass 1/4" 1/4" B-400-1-4
Swagelok to Male NPT Adapter Brass 3/8" 1/8" B-600-1-2
Swagelok to Male NPT Adapter Brass 3/8" 1/4" B-600-1-4

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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