3474 O-Ring Boss (ORB) Adjustable Union

The 3474 O-Ring Boss (ORB) Adjustable Union is designed for hydraulic systems that require a secure connection with the flexibility to position the fitting before final tightening. Its adjustable design makes it easier to achieve proper hose and tube alignment without forcing the hydraulic line into an unwanted position.

Available in steel construction and multiple sizes, the 3474 series is suitable for high-pressure hydraulic applications including machine tools, agricultural equipment, earth-moving machinery, instrumentation, chemical processing, and other demanding fluid power systems. Working pressure is rated up to 5,000 PSI, depending on tube and fitting size.

Key Specifications

• Series: 3474
• Fitting Type: ORB Adjustable Union
• Connection: Male ORB × Male ORB
• Configuration: Adjustable straight union
• Material: Steel
• Steel Materials: 12L14, 1045, Cold Formed 1010
• Plating: Clear Zinc Trivalent
• Working Pressure: Up to 5,000 PSI
• Sizes: 1/4" × 1/4" through 1-1/2" × 1-1/2"
• Applications: Industrial, agricultural, earth-moving, machine tools, instrumentation, and high-pressure hydraulic systems

Adjustable ORB Connection for Easier Positioning

The main advantage of the 3474 ORB Adjustable Union is its ability to be oriented before the connection is locked into its final position.

This is especially useful when hydraulic hoses or tubes need to be routed around machinery, frames, valves, manifolds, or other components. Instead of forcing the hose into alignment, the adjustable fitting allows the connection to be positioned more precisely.

That can help simplify installation and create a cleaner hydraulic assembly.

Reliable O-Ring Boss Sealing

The ORB connection uses an O-ring sealing system designed to provide a reliable seal at the hydraulic port.

The O-ring helps reduce leakage while the straight-thread connection allows the fitting to be properly positioned and secured. Proper O-ring condition, port compatibility, and installation torque are important for dependable hydraulic performance.

For replacement or maintenance work, always inspect the sealing area and replace damaged or worn O-rings before assembly.

Built for High-Pressure Hydraulic Systems

The 3474 series is rated for working pressures up to 5,000 PSI, with actual pressure capability varying according to tube and fitting size. The collection is specifically intended for high-pressure hydraulic applications.

For systems operating at or above 5,000 PSI, the complete hydraulic assembly should be evaluated to ensure the fitting, tubing, hose, mating components, and seals are suitable for the required operating conditions.

Steel Construction

The 3474 collection is available in steel, with the product page specifying steel materials including 12L14, 1045, and Cold Formed 1010. A clear zinc trivalent finish is also listed for the steel configuration.

This construction makes the fitting suitable for demanding hydraulic environments where strength and reliable connection performance are important.

The protective finish also provides additional resistance to corrosion during normal industrial service.

Why Use an Adjustable ORB Union?

A fixed fitting can become difficult to install when the connected hose or tube does not naturally line up with the port.

The adjustable design provides greater flexibility during assembly, helping installers position the hydraulic connection correctly before final tightening.

This can be particularly useful when:

• Hose routing is tight
• Ports are difficult to access
• Hydraulic components are mounted at different angles
• Equipment has limited installation space
• Tubing requires precise alignment
• A clean hydraulic layout is important

Applications

The 3474 ORB Adjustable Union is suitable for a wide range of hydraulic and fluid power equipment.

Typical applications include:

• Machine tools
• Agricultural machinery
• Earth-moving equipment
• Construction machinery
• Industrial hydraulic systems
• Instrumentation systems
• Chemical processing equipment
• Hydraulic manifolds
• Mobile hydraulic equipment
• OEM hydraulic assemblies

Gear House Hydraulics specifically lists machine tools, agricultural and earth-moving machinery, instrumentation, chemical processing systems, and other high-pressure hydraulic applications for this series.

3474 Features & Benefits

• Adjustable ORB connection
• Male ORB × Male ORB configuration
• Straight union design
• O-ring sealing
• Steel construction
• Clear zinc trivalent finish
• Multiple size options
• Working pressure up to 5,000 PSI
• Easier hydraulic line positioning
• Suitable for high-pressure applications
• Designed for industrial and mobile hydraulic equipment

Choosing the Right 3474 Size

Before ordering, confirm the ORB size required on both sides of the hydraulic assembly.

Check the existing port and mating component carefully rather than selecting a fitting based only on visual appearance. Thread size and port specifications should match correctly to achieve proper engagement and sealing.

Also consider:

• Required fitting size
• Hydraulic system pressure
• Hose or tube dimensions
• Available installation space
• O-ring condition
• Mating port compatibility

Selecting the correct size helps prevent installation problems and supports reliable hydraulic performance.

Why Choose Gear House Hydraulics?

Gear House Hydraulics supplies the 3474 ORB Adjustable Union series in multiple sizes for demanding hydraulic applications.

With adjustable positioning, O-ring sealing, steel construction, and high-pressure capability, these fittings provide a practical solution for hydraulic systems where connection alignment matters.

Whether used in mobile equipment, industrial machinery, agricultural systems, or hydraulic maintenance, the 3474 series helps create a secure and properly positioned ORB connection.

Frequently Asked Questions

What is a 3474 ORB Adjustable Union?

The 3474 is an adjustable O-Ring Boss union designed to connect two Male ORB connections while allowing positioning before final tightening.

What does an ORB adjustable union do?

It connects two ORB hydraulic ports or components while providing adjustment for better hose and tube alignment during installation.

What material is the 3474 available in?

The collection is available in steel, with listed steel materials including 12L14, 1045, and Cold Formed 1010.

What pressure can the 3474 handle?

The collection lists working pressures up to 5,000 PSI, with the actual rating depending on tube and fitting size.

What sizes are available?

Current sizes range from 1/4" × 1/4" to 1-1/2" × 1-1/2".

Where are 3474 ORB adjustable unions used?

They are suitable for machine tools, agricultural and earth-moving machinery, instrumentation, chemical processing systems, industrial hydraulics, and other high-pressure applications.

Does the 3474 use an O-ring?

Yes. The ORB connection uses an O-ring sealing system. The O-ring should be properly seated and inspected before installation.

Why choose an adjustable ORB union instead of a fixed union?

The adjustable design allows the connection to be positioned more precisely, which can make hose and tube routing easier in tight or complex installations.

Is the 3474 suitable for mobile hydraulic equipment?

Yes. Its adjustable design and high-pressure hydraulic application range make it suitable for demanding mobile and industrial equipment.

What should I check before ordering?

Confirm the ORB size, thread compatibility, pressure requirement, hose/tube size, and available installation space before selecting the fitting.