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Swagelok Straight Unions

Swagelok Straight Unions: Reliable Tube-to-Tube Connections for Process and Instrumentation Systems

Swagelok Straight Unions from TFM are precision-engineered to connect two tubes of the same diameter in a straight-line configuration. Featuring Swagelok’s industry-trusted dual-ferrule compression design, these fittings ensure leak-proof, torque-free seals that deliver consistent and secure performance in a wide range of gas and liquid applications.

Whether used in laboratory instrumentation, process control systems, or vacuum setups, Swagelok Straight Unions offer exceptional reliability, easy assembly, and compatibility with both stainless steel and brass tubing systems.

Key Features of Swagelok Straight Unions:

  • Leak-Proof, Torque-Free Sealing
    Swagelok’s advanced compression mechanism ensures gas-tight or liquid-tight sealing without excessive torque—enabling quick, safe, and repeatable installations.

  • Straight, In-Line Tube Connection
    Designed for joining equal-sized tubes, these unions are ideal for extending lines or bridging system components without changing the flow path.

  • Reduction of Hazardous and Costly Leaks
    Built to maintain seal integrity under vibration, pressure, and thermal changes, these fittings help eliminate system failures, reduce downtime, and enhance operational safety.

  • Material Flexibility for Media Compatibility

    • Stainless Steel Straight Unions: Best suited for gas systems, including corrosive or high-purity environments such as UHV, vacuum, and chemical delivery lines.

    • Brass Straight Unions: Ideal for water systems, cooling loops, and non-corrosive fluids under moderate pressure.

  • Supports Both Metric and Fractional Tubing Sizes
    Available in a wide range of sizes for global compatibility across process and instrumentation standards.

Applications:

  • Extending tubing lines in gas or liquid distribution systems

  • Joining equal-sized tubes in process panels, skids, or field assemblies

  • Vacuum and pressure control setups in lab or industrial settings

  • Fluid delivery in cooling, hydraulic, or analytical systems

  • Maintenance and retrofit of aging or modular tubing infrastructures

TFM also provides a comprehensive lineup of Swagelok-compatible fittings, including reducing unions, bulkhead connectors, tees, elbows, and NPT adapters, making it easy to build fully integrated, leak-free tubing systems tailored to your operational demands.

Ordering Table

Swagelok Straight Unions

Material Tube OD 1 Part Number
Stainless Steel 1/16" SS-100-6
Stainless Steel 1/8" SS-200-6
Stainless Steel 1/4" SS-400-6
Stainless Steel 3/8" SS-600-6
Brass 1/8" B-200-6
Brass 1/4" B-400-6
Brass 3/8" B-600-6
Material Tube OD 1 Part Number

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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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