ID
975351
$ 491.65
1-2 weeks delivery time
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The Vetus KO54 Type 6 Flexible Coupling is designed for pilot-bored Ø 20 mm shafts and ensures precise, vibration-free propulsion alignment. Its special conical clamping hub guarantees a 100 % concentric fit, saving installation time and improving driveline accuracy. Suitable for V-drive configurations, this coupling effectively absorbs torsional vibrations and shock loads, delivering smooth, quiet power transfer between the engine and propeller shaft. Compatible with Hurth, Velvet, Technodrive, ZF, and PRM gearboxes, it’s an ideal choice for engines up to 79.5 hp (1500 RPM) in pleasure and light-duty commercial craft.
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Vetus KO54 Type 6 Flexible Shaft Coupling – Pilot Bored Ø 20 mm, 4"/5" Flange, for V-Drives
The Vetus KO54 Type 6 Flexible Coupling is a precision marine driveline component designed to minimize vibration, noise, and alignment errors in propulsion systems. Its special conical clamping hub ensures a 100 % concentric connection between the propeller shaft and gearbox flange, allowing fast, accurate installation without runout or imbalance.
This coupling’s pilot-bored Ø 20 mm hub can be machined to suit specific shaft diameters, offering flexibility for various marine setups. Engineered for V-drive propulsion systems, the KO54’s flexible rubber element absorbs torsional vibration and cyclic irregularities, reducing drivetrain stress while maintaining smooth, quiet performance. It is especially effective for boats requiring compact installation and precise alignment under continuous load.
The KO54 supports both 4″ and 5″ flange connections, allowing direct installation on Hurth, Velvet, Technodrive, ZF, and PRM gearboxes. Optional adapter flanges are available for Volvo, Yanmar, and Kanzaki transmissions, making this coupling suitable for a wide range of applications.
Key Features
- Conical clamping hub ensures 100 % concentric shaft fit
- Pilot-bored Ø 20 mm – can be machined to required shaft size
- Excellent torsional vibration damping and noise reduction
- 4″ and 5″ flange compatibility for multiple gearbox types
- Ideal for V-drive propulsion systems
- Axial and radial shear protection for maximum safety
- Fast, simple installation – no keyway or taper machining required
- Marine-grade materials for durability and corrosion resistance
Technical Specifications
Parameter Value Product Code KO54 Manufacturer Vetus Type 6 – Flexible Coupling Purpose Flexible coupling for marine propulsion systems Application V-drive and direct-drive propulsion setups Shaft Diameter (Pilot Bore) Ø 20 mm (13/16") Flange Diameter 4″ / 5″ (standard gearbox flange) Total Diameter 137 mm (5 3/8") Height (L) 84 mm (3 5/16") 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) Max Admissible Power @ 1500 RPM 58.5 kW (79.5 HP) Hub Type Conical clamping hub – 100 % concentric fit Construction Steel hub with vulcanized rubber damping element Safety Features Axial and radial anti-shear locking system 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 pilot-bored Ø 20 mm shafts
- Engines up to ≈ 79.5 HP @ 1500 RPM
- V-drive installations requiring high alignment precision
- Direct installation on Hurth, Velvet, Technodrive, ZF, and PRM gearboxes
- Custom configurations with Volvo, Yanmar, or Kanzaki adapter flanges
The Vetus KO54 Type 6 Flexible Coupling delivers superior alignment precision, vibration isolation, and ease of installation. Its conical hub design guarantees a true concentric fit, while the flexible element ensures quiet, efficient power transfer. An ideal solution for compact V-drive and direct-drive marine systems seeking long-term reliability and reduced maintenance.
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