From Rigid Mounts to Flexible Shaft Adaptation

Early encoder installations often bolted the shaft directly to the drive, and every misalignment became a bearing failure. Over time, engineers learned that a small, purpose-built coupling absorbs that misalignment before it reaches the encoder. The SICK KUP-0810-S continues that evolution: a bar coupling with an 8 mm encoder-side bore and a 10 mm drive-side bore, rated for 0.8 N·m maximum torque and 10,000 rpm maximum speed.

In oil and gas plants, encoders on valve actuators, metering skids and pump drives rarely see perfect alignment. The KUP-0810-S addresses this with a glass-fiber-reinforced polyamide body and aluminum hub, built for demanding environments where vibration and temperature swings are routine.

Key Features and Technical Specifications

• Coupling type: Bar coupling for encoder shaft adaptation.
• Bore diameter, encoder side (D1): 8 mm.
• Bore diameter, drive side (D2): 10 mm.
• Material: Glass-fiber-reinforced polyamide with aluminum hub.
• Nominal torque: 0.8 N·m maximum (80 Ncm per datasheet).
• Max. speed: 10,000 rpm maximum.
• Axial offset compensation: max. axial shaft offset ± 0.3 mm.
• Radial offset compensation: max. radial offset ± 0.3 mm.
• Angular offset compensation: max. angular offset ± 3°.
• Operating temperature: –10 °C to +80 °C per datasheet.
• Overall length: 24 mm.

The 0.8 N·m torque ceiling matters in mission-critical installations. It protects the encoder from shock loads while still transmitting enough torque for position feedback. Similarly, the ± 0.3 mm axial and radial compensation ranges cover the small installation errors common on field-mounted equipment.

Where This unit Fits in Oil and Gas Operations

Encoders on valve positioners, flow meters and compressor controls need a reliable mechanical link to the drive shaft. This unit provides that link with an 8 mm to 10 mm bore transition. Because the coupling compensates for angular and radial offset, it reduces side loads on the encoder bearings. In upstream wellhead applications, the polyamide body resists the contaminants and temperature swings found near production equipment. Downstream, the same coupling supports metering and blending skids where repeatable position feedback supports custody transfer. For midstream pump and compressor packages, the 10,000 rpm maximum speed covers most auxiliary drive speeds. Each of these use cases benefits from a coupling that is field-proven in demanding environments.

Installation and Alignment Guidance

Mount the coupling so that the encoder shaft enters the 8 mm bore and the drive shaft enters the 10 mm bore. Keep axial shaft offset within ± 0.3 mm and radial offset within ± 0.3 mm. Angular misalignment should stay within ± 3°. Tighten the shaft connections according to the equipment manufacturer's procedure, because clamping screw details are not specified in the datasheet. After installation, rotate the shaft by hand to confirm free movement before applying power. These steps help the coupling deliver reliability you can depend on.

Maintenance and Reliability in Harsh Conditions

Inspect the coupling during scheduled maintenance rounds. Look for wear at the bores, cracks in the polyamide body and loosening at the shaft connections. Because the operating temperature range is –10 °C to +80 °C, confirm that nearby heat sources do not push the coupling beyond that window. In oil and gas environments, keep the coupling free of buildup that could restrict offset movement. Replacing a worn coupling early protects the encoder from bearing damage and avoids unplanned downtime on mission-critical equipment.

Compatibility and Integration Notes

This unit is a mechanical shaft adaptation accessory for SICK encoders with an 8 mm shaft and drive shafts with a 10 mm bore interface. It does not include electrical connections or network protocols. If your encoder installation involves a fieldbus network, wiring may require an external gateway or connection module. Confirm cable and gateway requirements with the supplier before commissioning.

Frequently Asked Questions

What is the operating temperature range of the SICK unit?

The SICK unit operates from –10 °C to +80 °C per datasheet.

Can this coupling handle a vfd replacement project on a pump drive?

Yes, This unit can serve as a mechanical link in vfd replacement work when the encoder shaft is 8 mm and the drive shaft is 10 mm. Verify torque and speed against the application.

What is the maximum torque and speed for This unit?

The SICK unit has a maximum nominal torque of 0.8 N·m and a maximum speed of 10,000 rpm.

How much misalignment can This unit compensate?

It compensates up to ± 0.3 mm axial offset, ± 0.3 mm radial offset and ± 3° angular offset.

What material is the coupling body made from?

The body is glass-fiber-reinforced polyamide with an aluminum hub.

Ordering and Support

Contact PetroPartsOnline for parts suited to your application's requirements. Please verify current lifecycle status and availability with PetroPartsOnline before ordering.

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