SICK KUP-0808-S Shaft Coupling (Bar / Beam Type, 8 mm / 8 mm)
Overview

The KUP-0808-S is a bar-type (beam) shaft coupling designed to connect two shafts of 8 mm diameter. It compensates for small misalignments while transferring torque in encoder, motor, or sensor assemblies. The coupling features a flexible loop design to absorb slight offset and angular errors, enabling smooth mechanical operation in compact motion systems.
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Key Specifications

Shaft Diameters: 8 mm → 8 mm (both sides)
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Maximum Shaft Misalignments:

Radial offset: ± 0.30 mm
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Axial offset: ± 0.20 mm
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Angular misalignment: ± 3°
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Maximum Speed: Up to 10,000 rpm
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Torque Capacity: Nominal up to 80 N·cm (0.8 N·m)
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Torsional Rigidity: ~38 Nm/rad
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Materials:

Coupling body: fiber-glass reinforced polyamide (plastic composite)
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Hub / inserts: aluminum
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Operating Temperature Range: –10 °C to +80 °C
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Other Features:

Low mass and inertia for minimal dynamic load

Beam / bar coupling design reduces backlash and allows flexibility

Light, compact connector suited for small axis assemblies

Engineering Highlights

Misalignment Compensation
The coupling’s elastic beam design accommodates small axial, radial, and angular errors, reducing mechanical stress on bearings and shafts.

Low-Inertia & Responsive
Its lightweight construction ensures minimal added inertia—beneficial in high-speed encoder or servo systems.

Backlash-Free Design
The continuous beam / loop design avoids mechanical play between connected shafts, maintaining positional accuracy.

Robust Material Selection
The combination of a rigid composite for the beam and aluminum hubs offers a balance of strength, flexibility, and corrosion resistance.

Use Cases & Applications

Coupling between motor / drive shaft and encoder in motion systems

Connecting sensor shafts in compact mechanical assemblies

Replacement coupling in existing systems where 8 mm shafts are used

Applications requiring precise angular control with minor misalignment tolerance