309704 Boss OEM Drive Coupler | Compressor Motor-to-Air-End Coupling

The Boss 309704 OEM Drive Coupler is an original equipment coupling engineered specifically for use in Boss compressor drive assemblies. This component connects the drive motor or engine to the compressor air-end, allowing rotational power to be transmitted efficiently while absorbing torsional vibration and compensating for minor shaft misalignment.

In industrial compressor systems, the drive coupler plays a critical role in protecting expensive rotating components. Improper elastomer characteristics, incorrect damping behavior, or dimensional inaccuracies can lead to excessive vibration, accelerated bearing wear, shaft damage, and premature air-end failure. The Boss 309704 coupler is manufactured to Boss OEM engineering standards to ensure proper fitment, balance, and long-term reliability in demanding operating environments.

This coupler is designed for continuous-duty compressor service where equipment is subjected to fluctuating loads, temperature variation, and extended operating cycles.

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Key Features and Benefits

• Genuine Boss OEM Part – Manufactured and specified by Boss for original equipment applications

• Exact Fit & Function – Direct replacement for the factory-installed drive coupler

• Elastomeric Flexible Design – Absorbs torsional vibration and dampens shock loads

• Smooth Torque Transmission – Provides stable, backlash-free power transfer

• Misalignment Compensation – Accommodates angular, axial, and parallel shaft misalignment

• Heavy-Duty Construction – Designed for continuous industrial compressor operation

• OEM Reliability – Preserves original compressor performance and service life

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Functional Design and Performance

The Boss 309704 OEM drive coupler utilizes a resilient elastomer element bonded to precision-machined metal hubs. This design allows the coupler to act as a torsional buffer, isolating vibration and transient torque spikes before they are transmitted into the compressor drive train.

During startup, shutdown, and load transitions, compressors generate torsional shock that can place significant stress on shafts, bearings, and seals. The elastomer element within the 309704 coupler absorbs these forces, helping maintain alignment, reduce mechanical noise, and protect adjacent components from damage.

Because this is a genuine OEM Boss component, the elastomer hardness, bonding method, and hub geometry are matched exactly to compressor operating characteristics. This ensures predictable damping behavior, consistent torque transfer, and reliable performance throughout the service life of the coupler.

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Applications and Compatibility

The Boss 309704 OEM Drive Coupler is commonly used in:

• Boss rotary screw and industrial air compressors

• Motor-to-air-end drive assemblies

• Industrial compressed air systems

• Compressor rebuilds and scheduled maintenance programs

This coupler is intended as a direct OEM replacement for the original factory-installed unit. Using the correct OEM coupler helps maintain proper alignment, vibration control, and protection of critical compressor components.

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Technical Specifications

• OEM Part Number: 309704

• Manufacturer: Boss Industries

• Component Type: Flexible elastomeric drive coupler

• Material: Steel hubs with bonded elastomer element

• Function: Torque transmission with vibration damping

• Misalignment Capability: Angular, axial, and parallel

• Operating Environment: Industrial compressor drive systems

• Maintenance: Lubrication-free; inspect during routine compressor service

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Performance Advantages of Using OEM

Using the Boss 309704 genuine OEM drive coupler ensures your compressor drive system operates exactly as designed. Aftermarket or non-OEM couplers may differ in elastomer stiffness, balance, or dimensional tolerances, which can introduce excessive vibration, reduce efficiency, and shorten air-end life.

This OEM coupler delivers consistent torque transmission, minimizes mechanical stress on connected components, and helps extend the service life of bearings, shafts, and compressor air-ends. For mission-critical compressed air systems, genuine OEM components are essential for maintaining uptime and reliability.

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Why Choose Stark Industrial Products

Stark Industrial Products supplies verified genuine OEM compressor components, including original Boss drive couplers. We do not substitute aftermarket equivalents when OEM parts are specified.

• Genuine OEM compressor parts

• Fast order processing and secure packaging

• Knowledgeable technical support

• Trusted supplier for industrial air compressor components

If you need help confirming compatibility with a specific Boss compressor model or drive configuration, our team is ready to assist.