316L Stainless Steel Tube Unions

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.

316L Stainless Steel Tube Unions

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Pricing available to approved customers

Key Features

Typical Applications

Key Features

Typical Applications

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