128387-412 Quincy OEM Coupling Element | Compressor Coupling Element

The 128387-412 Quincy OEM Coupling Element is a critical drivetrain component used in Quincy QGD-series rotary screw air compressors, specifically the QGD-40 and QGD-50 models. This elastomeric element fits between the coupling hubs in the motor-to-air-end drive assembly, allowing torque to be transmitted smoothly while isolating vibration and shock.

In rotary screw compressor applications, the coupling element is intentionally designed as a sacrificial wear component. It absorbs torsional vibration, startup shock, and minor shaft misalignment that naturally occur during operation. Over time, this element wears to protect more expensive components such as motors, air-ends, shafts, and bearings. Replacing the coupling element at proper service intervals is essential to maintaining compressor reliability and preventing secondary drivetrain damage.

The 128387-412 element is manufactured to Quincy’s OEM material and dimensional standards to ensure correct fit, predictable damping characteristics, and long service life in QGD-series compressors.

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Key Features and Benefits

• Genuine Quincy OEM Coupling Element – Factory-specified replacement component

• Designed for QGD-40 & QGD-50 Compressors – Correct fit and performance

• Elastomeric Flexible Design – Absorbs torsional vibration and shock loads

• Protects Drive Components – Reduces stress on motor and air-end shafts

• Smooth Torque Transmission – Maintains stable power transfer

• Serviceable Wear Component – Designed for periodic replacement

• OEM Reliability – Preserves original compressor performance

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Function and Performance

The 128387-412 coupling element functions as the flexible interface within the compressor drive coupling. As torque is transmitted from the motor to the air-end, the elastomer element flexes slightly to absorb vibration and accommodate small angular, axial, and parallel misalignment.

During startup and shutdown, compressors experience high torsional loads that can be damaging if transmitted directly through rigid connections. This coupling element dampens those forces, reducing noise, vibration, and mechanical stress throughout the drivetrain.

Because the element is manufactured to Quincy OEM specifications, its hardness, elasticity, and geometry are matched precisely to the operating characteristics of the QGD-40 and QGD-50 compressors. This ensures predictable wear behavior and consistent performance throughout its service life.

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Applications and Compatibility

The 128387-412 Quincy OEM Coupling Element is used in:

• Quincy QGD-40 rotary screw air compressors

• Quincy QGD-50 rotary screw air compressors

• Motor-to-air-end drive coupling assemblies

• Compressor maintenance and rebuild programs

This part is intended as a direct OEM replacement coupling element for Quincy compressors requiring part number 128387-412.

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Technical Specifications

• OEM Part Number: 128387-412

• Manufacturer: Quincy Compressor

• Component Type: Elastomeric coupling element

• Function: Torque transmission with vibration damping

• Application: QGD-40 and QGD-50 rotary screw compressors

• Operating Environment: Industrial compressed air systems

• Maintenance: Replace during scheduled service or when wear is present

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Importance of Replacing the Coupling Element

A worn or degraded coupling element can lead to increased vibration, misalignment stress, and excessive load on bearings and shafts. Left unaddressed, this can result in coupling hub damage, motor bearing failure, or air-end issues.

Replacing the coupling element with the 128387-412 Quincy OEM Coupling Element restores proper drivetrain flexibility and helps prevent costly secondary damage. Regular inspection and replacement of this wear component is a best practice for maintaining compressor uptime and long-term reliability.

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Why Choose Stark Industrial Products

Stark Industrial Products supplies verified genuine OEM compressor components, including coupling elements and drivetrain parts for Quincy compressors.

• Genuine OEM Quincy parts

• No aftermarket substitutions

• Fast order processing and secure packaging

• Knowledgeable technical support

If you need help confirming fitment for your QGD-40 or QGD-50, our team is ready to assist.