What the SICK KUP-1012-B Bellows Coupling Delivers

The SICK KUP-1012-B is a bellows shaft coupling for encoders with a 10 mm encoder-side bore and a 12 mm drive-side bore. It carries a maximum torque of 1.2 N·m and operates from –30 °C to +120 °C, making it a rugged shaft-adaptation component for mission-critical motion feedback.

In oil and gas installations, coupling failures often translate directly into unplanned downtime and lost production. This SICK coupling is built for demanding environments, where temperature swings and shaft misalignment are routine. Its stainless steel bellows and aluminum clamping hubs support dependable encoder feedback without frequent replacement.

Key Specifications and Cost Implications

• Coupling type: Bellows coupling with stainless steel bellows and aluminum clamping hubs.
• Bore diameter (encoder side, D1): 10 mm, matching common encoder shaft sizes.
• Bore diameter (drive side, D2): 12 mm (H8) for a secure fit on the drive shaft.
• Nominal torque: 1.2 N·m maximum (120 Ncm per datasheet).
• Max. speed: 10,000 rpm maximum, supporting high-speed feedback loops.
• Operating temperature: –30 °C to +120 °C (per datasheet).
• Axial offset compensation: max. ±0.4 mm.
• Radial offset compensation: max. ±0.25 mm; angular offset max. ±4°.
• Fastening: Cheese-head screw M2.5 × 8, DIN 912 A2.
• Overall length: 29 ± 1 mm.

Each of these parameters has a cost dimension. The 1.2 N·m torque capacity reduces the risk of coupling slip under load, which can otherwise cause position errors and scrap. The 10,000 rpm speed rating allows the coupling to serve high-speed encoder applications without added wear. Meanwhile, the wide –30 °C to +120 °C range means one part can cover multiple process areas, simplifying spares inventory and lowering holding costs.

How Offset Compensation Reduces Maintenance Cost

Misalignment between an encoder shaft and a drive shaft is a common source of bearing wear and signal error. This unit compensates for axial offset up to ±0.4 mm, radial offset up to ±0.25 mm, and angular offset up to ±4°. Consequently, minor installation tolerances do not translate into premature coupling failure. In practice, this reduces the frequency of inspection and replacement, which directly lowers maintenance labor and downtime expense.

The stainless steel bellows resist corrosion and fatigue, while the aluminum clamping hubs keep inertia low. Although mass moment of inertia is not available in the datasheet, the bellows design is typically selected for its balance of torsional stiffness and misalignment tolerance. For oil and gas engineers, that balance supports reliable encoder feedback in pump, compressor, and valve-actuator applications.

Installation and Integration Notes

Install the coupling by sliding the 10 mm bore onto the encoder shaft and the 12 mm bore onto the drive shaft. Tighten the M2.5 × 8 cheese-head screws evenly to secure the clamping hubs. Because the coupling is a shaft adaptation accessory, confirm that both shaft diameters match the specified bores before mounting.

For VFD-driven equipment, the coupling helps isolate encoder feedback from motor vibration. When replacing a failed servo motor or VFD part, verify that the new encoder shaft diameter matches the 10 mm bore. If the drive shaft is not 12 mm, a different coupling size may be required. Contact PetroPartsOnline for parts suited to your application's requirements.

Frequently Asked Questions

What is the operating temperature range of the SICK unit?

The SICK unit operates from –30 °C to +120 °C per the datasheet. This range supports use in hot process areas and cold outdoor installations without additional thermal protection.

Can this coupling be used for servo motor replacement?

Yes, This unit is a shaft adaptation coupling that can connect an encoder to a drive shaft during servo motor replacement. Confirm that the encoder shaft is 10 mm and the drive shaft is 12 mm (H8).

What is the maximum speed and torque of This unit?

The coupling is rated for a maximum speed of 10,000 rpm and a maximum torque of 1.2 N·m (120 Ncm). These ratings suit high-speed encoder feedback and moderate torque transmission.

How much misalignment can the coupling compensate?

The SICK unit compensates for axial offset up to ±0.4 mm, radial offset up to ±0.25 mm, and angular offset up to ±4°. This tolerance reduces installation precision requirements and extends service life.

Where can I source vfd replacement parts like this coupling?

PetroPartsOnline supplies This unit and other vfd parts for industrial automation and oil and gas operations. Contact us to confirm current lifecycle status and availability before ordering.

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