ID
975200
$ 633.77
1-2 weeks delivery time
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The Vetus BULFL011 Bullflex 1 Flexible Coupling provides superior vibration damping and precise shaft alignment for propulsion systems with a 1-inch (25 mm) propeller shaft.
Its flexible rubber element minimizes torsional vibrations and mechanical noise while maintaining secure power transmission without backlash. Designed for smooth, quiet operation, this coupling allows up to 2° of misalignment and offers galvanic isolation between the engine and shaft for long-term protection.
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Vetus BULFL011 – Bullflex 1 Flexible Coupling, Shaft Ø 1" (25 mm)
The Vetus Bullflex 1 Flexible Coupling is engineered to provide optimal torsional vibration damping and precise alignment for marine propulsion systems. It is specially designed for shafts of Ø1" (25 mm) and comes with a 4-inch flange fitting most standard marine gearboxes such as Hurth, Velvet, Technodrive, ZF, and PRM.
The Bullflex coupling features a pre-tensioned flexible rubber element that effectively isolates noise and vibrations while ensuring smooth torque transmission between the engine and propeller shaft. Its centering ring simplifies installation and guarantees exact shaft positioning. With a permissible 2° misalignment, the coupling maintains precise balance even under demanding operating conditions.
Key Features
- Exceptional vibration and noise damping for smoother engine performance
- High flexibility – compensates misalignments up to 2°
- Built-in thrust damper reduces axial vibration and stress
- Galvanic isolation between engine and propeller shaft
- Non-tapered clamping hub for easy installation and removal
- Secured against shearing off both axially and radially
- Excellent centering ensures smooth rotation and high shaft RPM stability
Technical Specifications
Parameter Value Product Code BULFL011 Manufacturer Vetus Type Bullflex 1 Shaft Diameter Ø1" (25 mm) Flange Size 4 inch Diameter (mm) 100 Height (mm) 85 Permissible Misalignment Up to 2° Max Torque (Pleasure) 75 Nm Max Torque (Commercial) 45 Nm DIN 6270B (Pleasure Craft) 0.8 kW (1.1 HP)/100 RPM DIN 6270A (Commercial Craft) 0.5 kW (0.7 HP)/100 RPM Max RPM (Zero Misalignment) 7000 RPM Max RPM (2° Misalignment) 3500 RPM Indicative Engine Power @ 2:1 Gear Ratio Up to 19 HP Indicative Engine Power @ 2.5:1 Gear Ratio Up to 15 HP Application Marine propulsion systems, sterngear, shaft alignment
Installation Compatibility
Direct fit (no adapter required):
- Hurth, Velvet, Technodrive, ZF, PRM gearboxes
- Requires UNISET4/5 Stud & Bolt Set for installation
With adapter flanges:
- FLANGE1 – Yanmar KM2C, KMP2P, KM3P; Kanzaki KC30/45/100
- FLANGE2 – Volvo MS10A/L, MS15A/L, MS25A/L
- FLANGE2A – Volvo MS, MSB, MS2 types
- FLANGE3 – Yanmar KM4A, KMH4A, KBW20-1, KBW21; Kanzaki KC180
Applications
- Vibration and noise reduction in marine driveline systems
- Engine-to-propeller shaft coupling for pleasure and light commercial craft
- Installation where alignment accuracy and vibration control are critical
- Ideal for vessels with flexible engine mounts and self-aligning bearings
The Vetus Bullflex 1 Flexible Coupling delivers exceptional reliability and performance in marine propulsion systems. Its advanced rubber damping system and precision centering design ensure quiet, efficient power transfer with minimal vibration — even at high RPMs.
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