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316L Stainless Steel Tube Unions

316L Stainless Steel Tube Unions

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316L stainless steel straight compression unions for connecting two tubes of equal outside diameter in laboratory, analytical and fluid-handling systems. Available in selected metric and fractional sizes.

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S4R 316L Stainless Steel Straight Tube Unions provide compact, equal-size tube-to-tube connections for laboratory, analytical and fluid-handling systems. Their 316L stainless steel construction combines corrosion resistance with mechanical durability, while the straight compression configuration provides a practical solution for joining tubing of identical outside diameter. Selected metric and fractional tube sizes are available for scientific instrumentation and general laboratory assemblies.

Key Features

✓ 316L stainless steel construction
✓ Equal-size straight tube-to-tube connection
✓ Compression / ferrule-type connection
✓ Compact configuration for instrumentation assemblies
✓ Metric and fractional tube size options
✓ Designed for laboratory gas and fluid-handling systems

Typical Applications

• Laboratory gas and fluid lines
• Analytical and scientific instrumentation
• Electrochemical research equipment
• Chemical and solvent transfer systems
• Process and vacuum instrumentation
• General laboratory tubing assemblies
Technical Specifications
Fitting Type Straight tube union
Connection Equal-size tube × tube
Material 316L Stainless Steel
Connection Type Compression / ferrule-type
Configuration Equal straight union
Tube Sizing Metric / Fractional Inch
Available Tube Sizes
Size Standard Standard Tube OD
Metric Ø4 / Ø6 / Ø8 / Ø10 / Ø12 mm
Fractional Inch 1/8" / 1/4" / 3/8" / 1/2"
Select the tube outside diameter corresponding to the tubing used in the assembly. Metric and fractional tube sizes follow separate dimensional standards.
Connection & Design
• Straight union geometry provides an in-line connection between two tubes of identical outside diameter.
• Compression / ferrule-type connections allow installation without welding the fitting directly to the tubing.
• The selected fitting size must correspond to the actual outside diameter of both tubes.
• Metric and fractional fittings should be matched with tubing manufactured to the corresponding dimensional standard.
Technical Notes
• Verify the actual tube outside diameter before selecting the fitting size.
• Tubing should be clean, round and free from surface damage in the connection area.
• Tube material and wall thickness should be appropriate for compression fitting installation.
Package Contents
1×
316L Stainless Steel Straight Tube Union
Selected tube size
Installation & System Compatibility
Verify tube outside diameter, fitting size, tube material and chemical compatibility before installation. Metric and fractional tube sizes follow separate dimensional standards and should not be considered interchangeable. 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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