ISO Stainless Steel Sanitary Union – 4-Piece Assembly

ISO Stainless Steel Sanitary Union – 4-Piece Assembly

RR STEEL manufactures ISO stainless steel sanitary unions for detachable piping connections in hygienic processing, industrial fluid handling and compatible data center liquid cooling systems.

Our four-piece union assemblies are designed to connect matching stainless steel piping components while allowing convenient installation, inspection and maintenance.

Available in SS304 and SS316L stainless steel, these products can be supplied according to customer drawings, dimensional specifications and OEM purchasing requirements.

What Is an ISO Stainless Steel Sanitary Union?

An ISO stainless steel sanitary union is a detachable pipe fitting manufactured according to a specified ISO-compatible connection design.

A typical four-piece assembly consists of a union nut, two matching connection components and a sealing gasket.

The nut secures the mating components, while the sealing interface provides a fluid-tight connection when correctly assembled under suitable operating conditions.

Unlike permanently welded joints, sanitary unions allow piping sections and equipment connections to be separated for inspection, servicing or replacement.

Key Features

• Four-Piece Assembly: Typical configuration includes a union nut, two matching connection components and a gasket.

• Detachable Connection: Facilitates equipment installation, disassembly and maintenance.

• Material Options: SS304 and SS316L stainless steel.

• Precision CNC Machining: Supports accurate connection profiles, mating dimensions and sealing interfaces.

• Multiple Size Options: Nominal sizes and connection dimensions can be supplied according to the specified design.

• OEM Manufacturing: Custom dimensions, materials and component configurations are available based on drawings.

ISO Union Components and Available Configurations

RR STEEL can manufacture and supply complete ISO sanitary union assemblies and related components.

Typical Union Components

• Stainless steel union nut

• Male connection component

• Matching female connection component

• Suitable sealing gasket

Available Manufacturing Options

• SS304 and SS316L stainless steel

• Different nominal pipe sizes

• Weld-end connection configurations

• Customized mating and sealing dimensions

• OEM union nuts and CNC-machined components

• Surface finish and marking requirements

Important: The exact ISO connection specification must be confirmed before production. ISO, DIN, SMS and RJT union components should not be assumed interchangeable without checking the mating dimensions and sealing geometry.

Applications

1. Data Center CDU Liquid Cooling Systems

ISO stainless steel sanitary unions may be used in compatible data center liquid cooling piping assemblies where detachable stainless steel connections are required.

Potential applications include:

• CDU primary-side coolant piping connections

• CDU secondary-side coolant distribution piping

• Stainless steel coolant supply and return assemblies

• Serviceable connections in prefabricated liquid cooling pipework

• Selected stainless steel manifold and distribution piping components

For CDU liquid cooling applications, the complete union assembly must be evaluated for operating pressure, temperature, coolant chemistry, gasket compatibility, dimensional fit and leak-tightness requirements.

RR STEEL manufactures stainless steel components used in CDU systems, rather than complete CDU equipment.

2. Food, Beverage and Dairy Processing

ISO sanitary unions can be used in compatible hygienic processing lines where removable stainless steel piping connections are required.

Typical applications include dairy equipment, beverage processing, food production lines and hygienic fluid transfer systems.

3. Pharmaceutical and Cosmetic Equipment

Suitable configurations can be used in processing equipment where material grade, surface finish, cleaning requirements and connection specifications meet the intended process conditions.

4. Industrial Fluid Handling

ISO stainless steel unions may also be used in compatible industrial fluid piping systems requiring detachable connections and suitable sealing performance.

ISO Unions Compared with Other Sanitary Union Standards

RR STEEL manufactures different sanitary union configurations for international piping applications.

• ISO Sanitary Unions: Manufactured according to the specified ISO-compatible connection dimensions.

• DIN Sanitary Unions: Designed for the relevant DIN connection and sealing dimensions.

• SMS Sanitary Unions: Used in piping systems requiring SMS-compatible connections.

• RJT Sanitary Unions: Available in different nut configurations for matching RJT piping assemblies.

Different union standards may use different mating profiles, thread dimensions, gasket designs and nominal pipe dimensions. Interchangeability must be verified before installation.

Related Stainless Steel Products

RR STEEL also supplies complementary stainless steel piping components, including:

• DIN Stainless Steel Sanitary Unions

• SMS Stainless Steel Sanitary Unions

• RJT Round Nut and Hex Unions

• Sanitary Weld Ferrules and Clamps

• Stainless Steel Adapters

• Sanitary Elbows and Tees

• Custom CNC-Machined Fittings

• Liquid Cooling Piping and Manifold Components

OEM and Custom Manufacturing

RR STEEL supports OEM manufacturing of ISO stainless steel sanitary unions and precision-machined connection components.

With more than 120 CNC machines, our manufacturing capabilities support repeatable production of union nuts, mating connection profiles and other stainless steel fittings.

Custom manufacturing requirements may include:

• Specified ISO connection dimensions

• Nominal pipe sizes and weld-end dimensions

• SS304 or SS316L material selection

• Custom union nut and connection profiles

• Gasket and sealing interface requirements

• Surface finish and product marking

• Batch manufacturing and traceability requirements

Why Choose RR STEEL?

• Precision Manufacturing: More than 120 CNC machines for stainless steel component production.

• Production Equipment: Over 20 robotic units supporting manufacturing operations.

• Sanitary and Industrial Expertise: Manufacturing experience across multiple stainless steel fitting standards.

• Liquid Cooling Component Supply: Stainless steel fittings, adapters, clamps, ferrules and custom components for compatible CDU piping projects.

• Quality Inspection: Material verification, dimensional inspection and project-specific quality checks.

• OEM Support: Manufacturing according to customer drawings, technical specifications and purchasing requirements.

Request a Quotation

Looking for ISO stainless steel sanitary unions or customized four-piece union assemblies?

Contact RR STEEL with your required connection specification, size, material, gasket requirements, technical drawings and estimated purchase quantity for evaluation and quotation.