Universal Lateral Offset Couplings

What Is a Unilat Coupling?

A Unilat coupling is a precision-engineered shaft coupling that combines the operating principles of an Oldham coupling and a universal joint.

An Oldham coupling is excellent at compensating for radial (parallel) shaft offset, while a universal joint excels at handling angular misalignment. Individually, each coupling style has limitations. By combining both technologies into one assembly, the Unilat coupling provides simultaneous compensation for angular and radial misalignment while maintaining zero backlash torque transmission.

This unique design allows equipment to tolerate more complex shaft alignment conditions than many conventional coupling styles without sacrificing positioning accuracy or increasing drivetrain stress.

Because of these capabilities, universal lateral offset couplings are commonly specified for:

• Servo-driven automation systems
• Robotics
• Packaging machinery
• CNC equipment
• Semiconductor manufacturing
• Laboratory automation
• Precision inspection systems
• Motion control equipment
• Printing and converting machinery

 
In these applications, machinery often experiences installation tolerances, thermal expansion, or frame deflection, which create both angular and radial shaft offsets. A Unilat coupling helps compensate for these conditions while preserving accurate rotational performance.

Why Choose a Unilat Coupling Instead of Other Coupling Types?

Every shaft coupling is designed to solve different alignment challenges.

Traditional Oldham couplings perform exceptionally well when correcting radial offset but have more limited angular capability. Universal joints provide angular flexibility but are not designed to compensate for significant parallel shaft displacement while maintaining precision positioning.

The Unilat Design Bridges Gap by Accommodating Both Forms of Misalignment Simultaneously

Compared to many bellows couplings, Unilat couplings can tolerate greater shaft misalignment while still delivering precise motion transmission. Bellows couplings are often selected for applications where torsional stiffness is the primary concern and shaft alignment is already well controlled. When equipment experiences greater installation variation or operating movement, the additional flexibility offered by a Unilat coupling may provide a more suitable long-term solution.

Selecting the appropriate coupling ultimately depends on the machine's alignment conditions, operating speeds, torque requirements, and required positioning accuracy. Ondrives.US engineers can help determine which solution best fits your application.

Understanding Angular Compensation & Electrical Isolation

One of the distinguishing features of Unilat couplings' zero-backlash designs is their ability to compensate for up to 10 degrees of angular misalignment while simultaneously accommodating radial shaft offset.

This expanded angular capability helps reduce stress placed on shafts, bearings, and connected drivetrain components when equipment cannot maintain perfect alignment during operation.

Coupling Also Provides Electrical Isolation of up to 3,000 Volts Between Connected Shafts

Electrical isolation can be especially valuable in servo systems, encoder-driven machinery, test equipment, and other precision applications where stray electrical current or grounding issues may interfere with sensitive electronic components. By electrically separating connected shafts, the coupling helps reduce the possibility of unwanted current passing through bearings or other drivetrain components.

Together, these capabilities provide a practical solution for applications where both mechanical alignment and electrical isolation influence long-term equipment reliability.

Performance Specifications

Ondrives.US offers Unilat couplings for OEMs, machine builders, and automation engineers seeking dependable motion transmission, smooth operation, and long service life. Available in both inch and metric sizes, these couplings can be supplied in standard configurations or customized to meet specific application requirements.

Typical performance information includes:

• Zero backlash operation
• Maximum torque ratings
• Maximum operating speeds
• Angular compensation up to 10°
• Radial misalignment capability
• Electrical isolation up to 3,000 volts
• Operating temperature range

Physical Specifications

Include:

• Outside diameters
• Overall lengths
• Bore dimensions
• Inch and metric sizing
• Hub configurations
• Weight (if applicable)

Materials & Construction Options

Construction options may include:

• Precision-machined aluminum components
• Engineered insulating center elements
• Standard bore sizes
• Custom bore configurations
• Clamp hub styles
• Set screw hub styles
• Corrosion-resistant finishes

Standard & Custom Manufacturing Capabilities

Ondrives.US manufactures both standard catalog products and engineered coupling solutions for demanding motion control applications. In addition to standard product sizes, many universal lateral offset couplings can be modified to meet unique equipment requirements.

Custom manufacturing capabilities include:

• Standard inch and metric bore sizes
• Custom bore machining
• Clamp hub configurations
• Set screw hub configurations
• Keyways and drive flats
• Application-specific modifications
• Engineering consultation for OEM equipment

Whether you're designing a new automation system or replacing an existing coupling, our engineering team can recommend a solution based on shaft size, torque requirements, operating speed, and expected alignment conditions.

Why Choose Ondrives.US?

Selecting the right coupling involves more than reviewing technical specifications. It requires working with a manufacturer that understands precision motion control applications and can provide engineering support throughout the design process.

When you partner with Ondrives.US, you benefit from:

• Direct manufacturer expertise
• Precision-engineered motion control components
• Standard inch and metric product availability
• Custom machining capabilities
• Application-specific modifications
• Engineering support from concept through production
• Reliable quality and consistent manufacturing
• Solutions designed for OEMs and machine builders

Our team works closely with engineers across numerous industries to develop coupling solutions that improve equipment performance, simplify installation, and support long-term reliability.

Request a Quote

Whether you need a standard Unilat coupling or a custom-engineered solution, Ondrives.US can help. Contact our engineering team today to discuss your application or request a quote for Unilat couplings with zero backlash, which accommodate both angular and radial shaft misalignment while delivering precision motion control performance.