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Swagelok Union Crosses

Swagelok Union Crosses: Reliable Four-Way Tube Connections for Complex Flow Systems

Swagelok Union Crosses from TFM are engineered to create four-way intersections between tubing lines in high-integrity gas or liquid systems. Each fitting is equipped with four Swagelok compression ports, allowing tubing to connect from all sides while maintaining leak-proof, torque-free seals that Swagelok is known for.

These union crosses are ideal for applications requiring branching or merging of flow paths, pressure monitoring at system intersections, or creating symmetrical tubing layouts in confined instrumentation or process setups.

Key Features of Swagelok Union Crosses:

  • Leak-Proof, Torque-Free Sealing
    Each tube connection is secured using Swagelok’s dual-ferrule compression system, delivering consistent gas-tight or fluid-tight performance without over-tightening.

  • Four-Way Flow Configuration
    With a cross-style geometry, Swagelok Union Crosses support symmetrical flow distribution, making them ideal for test rigs, sample manifolds, or central monitoring points.

  • Cost and Safety Benefits
    These fittings are specifically designed to prevent hazardous leaks in process or instrumentation tubing, reducing maintenance demands and supporting long-term system safety.

  • Material Options for Targeted Use

    • Stainless Steel Union Crosses: Best suited for gas systems, corrosive environments, or ultra-high vacuum (UHV) assemblies.

    • Brass Union Crosses: Recommended for water systems, low-pressure applications, and general industrial fluid handling.

  • Compatible with Fractional or Metric Tubing
    Swagelok Union Crosses are available in various sizes to suit standard tubing specifications, with smooth installation and repeatable performance in both bench-top and field environments.

Applications:

  • Multi-directional tube routing in instrumentation panels

  • Vacuum and pressure sensor integration points

  • Centralized sample injection or extraction junctions

  • Gas and fluid distribution manifolds

  • Cooling line distribution within compact equipment housings

TFM offers a comprehensive inventory of Swagelok-compatible components, including union tees, bulkhead fittings, NPT adapters, and valves, allowing full system design flexibility. The Swagelok Union Crosses are a foundational component for any tubing network requiring precision, safety, and structural integrity.

Ordering Table

Reference Material Tube OD 1 Part Number
Swagelok Union Crosses Stainless Steel 1/8" SS-200-4
Swagelok Union Crosses Stainless Steel 1/4" SS-400-4
Swagelok Union Crosses Stainless Steel 3/8" SS-600-4
Swagelok Union Crosses Brass 1/4" B-400-4
Swagelok Union Crosses Brass 3/8" B-600-4

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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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