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316L Stainless Steel Union Reducers

316L Stainless Steel Union Reducers

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316L stainless steel straight reducing compression unions for connecting tubes of different outside diameters in laboratory, analytical and fluid-handling systems. Available in selected fractional-inch size combinations.

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  • Tube Size (Large OD × Small OD)

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S4R 316L Stainless Steel Straight Reducing Tube Unions provide a compact in-line transition between tubes of different outside diameters. Designed for laboratory, analytical and fluid-handling systems, their 316L stainless steel construction combines corrosion resistance with mechanical durability, while the compression / ferrule-type connection allows installation without welding the fitting directly to the tubing. Selected fractional-inch reducing combinations are available for common laboratory and instrumentation assemblies.

Key Features

✓ 316L stainless steel construction
✓ Direct transition between different tube outside diameters
✓ Compression / ferrule-type tube connections
✓ Weld-free fitting installation
✓ Compact straight reducing configuration
✓ Selected fractional-inch tube-size combinations

Typical Applications

• Laboratory gas and fluid lines
• Analytical and scientific instrumentation
• Electrochemical research equipment
• Chemical and solvent transfer systems
• Process and vacuum instrumentation
• Tube-size transition assemblies
Technical Specifications
Fitting Type Straight reducing tube union
Connection Unequal-size tube × tube
Material 316L Stainless Steel
Surface Finish Chrome-plated
Connection Type Compression / ferrule-type
Configuration Straight reducing
Tube Sizing Fractional Inch
Available Configurations
Large Tube OD Small Tube OD Configuration
1/4" 1/8" 1/4" × 1/8"
3/8" 1/8" 3/8" × 1/8"
1/2" 1/8" 1/2" × 1/8"
3/8" 1/4" 3/8" × 1/4"
1/2" 1/4" 1/2" × 1/4"
Select the tube-size combination corresponding to both tubes in the assembly. Tube sizes refer to nominal outside diameter.
Connection & Design
• Straight reducer geometry provides an in-line transition between two different tube outside diameters.
• Compression / ferrule-type connections allow installation without welding the fitting directly to the tubing.
• The selected configuration must correspond to the actual outside diameters of both tubes.
• The reducing configuration enables direct tube-size transitions while maintaining a compact in-line assembly.
Technical Notes
• Verify both tube outside diameters before selecting the fitting configuration.
• Tubing should be clean, round and free from surface damage in the connection areas.
• Tube material and wall thickness should be appropriate for compression fitting installation.
Package Contents
1×
316L Stainless Steel Straight Reducing Tube Union
Selected tube-size combination
Installation & System Compatibility
Verify both tube outside diameters, fitting configuration, tube material and chemical compatibility before installation. Operating limits depend on the complete assembly, including tube material, wall thickness, operating temperature, process media and installation conditions. For pressure-critical, vacuum-critical or temperature-critical applications, contact S4R to confirm suitability for the intended operating conditions.

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