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Swagelok Straight Reducing Unions

Swagelok Straight Reducing Unions: Leak-Free Tube Size Transitions for Precision Systems

Swagelok Straight Reducing Unions from TFM are engineered to join two differently sized tubes in a straight-line configuration, offering a compact, secure, and leak-proof connection. These fittings utilize Swagelok’s reliable dual-ferrule compression sealing, which provides torque-free assembly and repeatable performance, even in demanding gas or fluid systems.

Designed for instrumentation, process control, vacuum, and analytical applications, these reducing unions ensure a smooth transition between tube sizes while maintaining the integrity of the system.

Key Features of Swagelok Straight Reducing Unions:

  • Leak-Proof, Torque-Free Seals
    Swagelok’s compression design ensures tight, vibration-resistant tube sealing without the need for over-tightening or rework.

  • Size Reduction in Compact Spaces
    These straight fittings allow you to join two tubes of different diameters in-line—ideal for adapting system layouts while preserving flow continuity.

  • Elimination of Costly and Hazardous Leaks
    By minimizing potential leak paths in instrumentation and process tubing, Swagelok Straight Reducing Unions support system safety, accuracy, and reliability.

  • Material Options for Specific Applications

    • Stainless Steel Reducing Unions: Designed for gas systems, corrosive environments, and high-purity or high-pressure conditions.

    • Brass Reducing Unions: Ideal for water systems or non-aggressive media under lower pressure.

  • Available in Multiple Tube Size Combinations
    Suitable for fractional and metric tubing, these fittings are available in a wide range of inlet/outlet size pairings to match system requirements.

Applications:

  • Connecting high-pressure gas lines to low-flow tubing in analytical systems

  • Reducing fluid transfer lines in laboratory or process panels

  • Interfacing sampling or sensor ports with primary flow channels

  • Integrating older or non-standard tubing sizes into upgraded systems

  • Supporting HVAC, water, or coolant loops with size variation

TFM also offers a complete suite of Swagelok-compatible components, including union elbows, tees, bulkhead reducing unions, and NPT adapters, allowing engineers to build fully integrated and scalable tube systems with confidence.

Ordering Table

Reference Material Tube OD 1 Part Number
Swagelok Straight Reducing Unions Stainless Steel 3/16"-1/16" SS-300-6-1
Swagelok Straight Reducing Unions Stainless Steel 3/16"-1/8" SS-300-6-2
Swagelok Straight Reducing Unions Stainless Steel 1/4"-1/16" SS-400-6-1
Swagelok Straight Reducing Unions Stainless Steel 1/4"-1/8" SS-400-6-2
Swagelok Straight Reducing Unions Stainless Steel 1/4"-3/16" SS-400-6-3
Swagelok Straight Reducing Unions Stainless Steel 5/16"-1/4" SS-500-6-4
Swagelok Straight Reducing Unions Stainless Steel 3/8"-1/4" SS-600-6-4
Swagelok Straight Reducing Unions Brass 3/16"-1/8" B-300-6-2
Swagelok Straight Reducing Unions Brass 1/4"-3/16" B-400-6-3
Swagelok Straight Reducing Unions Brass 3/8"-1/4" B-600-6-4
Swagelok Straight Reducing Unions Brass 1/2"-3/8" B-810-6-6

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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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