ID
976356
$ 588.63
1-2 weeks delivery time
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The Vetus KO51 Type 6 Flexible Coupling is a precision-engineered shaft coupling for marine propulsion systems with a 25 mm shaft diameter, designed to provide excellent vibration damping and fast, reliable installation. Featuring a special conical clamping hub, it guarantees a 100% concentric fit, saving time and ensuring smooth power transmission between the engine and propeller shaft. Suitable for V-drive configurations and engines up to 91 hp (2:1 gear reduction), this coupling delivers quiet operation, secure alignment, and durability under demanding marine conditions.
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Vetus KO51 Type 6 Flexible Shaft Coupling – Ø 25 mm Shaft, 4"/5" Flange, for V-Drives
The Vetus KO51 Type 6 Flexible Coupling is designed for optimal vibration damping and precise shaft alignment in marine propulsion systems. Its special conical clamping hub ensures a perfect 100% concentric fit between the propeller shaft and gearbox flange, minimizing installation effort and eliminating alignment errors.
Engineered for V-drive applications, the KO51 provides smooth, noise-free torque transmission between the engine and propeller shaft, reducing wear on bearings and drivetrain components. Its robust flexible element effectively absorbs torsional vibrations and cyclic irregularities, ensuring a long service life and stable operation at all RPM ranges.
With compatibility for a wide range of marine gearboxes and a 4" or 5" flange pattern, the KO51 is a versatile solution for both pleasure craft and light commercial vessels. It can be installed directly on Hurth, Velvet, Technodrive, ZF, and PRM gearboxes, while adapter flanges are available for Volvo, Yanmar, and Kanzaki transmissions.
Key Features
- Special conical clamping hub guarantees 100% concentric shaft fit
- Fast installation – no keyway or machining required
- High-performance vibration damping and noise reduction
- 4" and 5" flanges compatible with most gearbox types
- Suitable for V-drive propulsion systems
- Secured against axial and radial shear for maximum safety
- Provides reliable alignment and smooth torque transfer
- Compatible with adapter flanges for Volvo, Yanmar, and Kanzaki gearboxes
- Durable and maintenance-free design
Technical Specifications
Parameter Value Product Code KO51 Manufacturer Vetus Purpose Flexible shaft coupling for marine propulsion systems Application Suitable for V-drive installations Shaft Diameter Ø 25 mm Flange Diameter 4" / 5" (standard gearbox flange) Total Diameter 137 mm Height 84 mm Weight 2.7 kg DIN 6270B (Pleasure Craft) 3.9 kW / 100 shaft RPM (5.3 HP) DIN 6270A (Commercial Craft) 3.3 kW / 100 shaft RPM (4.5 HP) Maximum Power (2:1 Gear Reduction) Approx. 91 HP Maximum Power (2.5:1 Gear Reduction) Approx. 88 HP Hub Type Conical clamping hub – 100% concentric fit Construction Steel hub with vulcanized rubber damping element Safety Design Axial and radial anti-shear protection Compatible Gearboxes (Direct Fit) Hurth, Velvet, Technodrive, ZF, PRM Adapter Flanges (Optional) FLANGE1 (Yanmar/Kanzaki), FLANGE2 & FLANGE2A (Volvo) Recommended Stud Kit UNISET4/5 for direct gearbox installation
Applications
- Marine propulsion systems using 25 mm propeller shafts
- Engines up to approximately 91 HP (2:1 gear ratio)
- V-drive configurations requiring concentric precision alignment
- Direct installation on Hurth, Velvet, Technodrive, ZF, and PRM gearboxes
The Vetus KO51 Type 6 Flexible Coupling offers fast installation, superior vibration damping, and precision alignment. Its innovative conical clamping hub guarantees perfect concentricity, improving propulsion smoothness, reducing drivetrain stress, and ensuring long-lasting reliability in both pleasure and commercial marine applications.
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