SU-4

SU 1/4 in. Tube Outside Diameter D Union

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SKU: SU-4 Category: Union Tube Fittings Tag: Top Selling

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Specifications

Inch/Metric	Inch
Tube Outside Diameter D	1/4in, mm
Width Across Flats h	1/2in

Dimensions

Dimension A	15.24mm
Dimension B	17.78mm
Dimension I	26.16mm
Dimension L	40.89mm
Dimension d [Min]	4.82mm

Description

(SU-4)

1/4" Stainless Steel Tube Union – Sanitary Compression Fitting

The SU-4 tube union is a 1/4" stainless steel compression fitting designed for high-purity applications in hygienic fluid processors, sanitary, and industrial systems. Made from 316 stainless steel, this sanitary stainless steel fitting uses corrosion-resistant alloys to provide a secure, leak-tight connection, supporting clean in place instrumentation, hygienic valves, and precise fluid control.

Material: 316 Stainless Steel (Corrosion-Resistant Alloy)
Connection Type: 1/4" Tube OD x 1/4" Tube OD
Applications: Sanitary tubing, CIP systems, hygienic valves, lab skids, OEM fluid panels

This 1/4 union fitting—also referred to as a 1/4 union connector, Swagelok stainless steel union alternative (Swagelok equivalent: SS-400-6), or 1/4 tubing union—ensures precise fluid control in biotech, food and beverage, and pharmaceutical systems.

Its corrosion-resistant alloys resist corrosion and support frequent maintenance cycles, making it ideal for hygienic fluid processors. The SU-4 is a reliable choice for engineers specifying components for sanitary systems, offering easy installation and long-term integrity. Whether you’re building lab skids or upgrading industrial piping, this union delivers sanitary performance and durability.

Compatibility

This part may be used in place of the following parts from other manufacturers:

Swagelok®	SS-400-6

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