ID
975928
$ 3,172.86
1-2 weeks delivery time
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The Vetus BULFL3270 Bullflex 32 Flexible Coupling (shaft Ø 70 mm, type 32) ensures high-performance vibration damping, secure torque transmission, and precision shaft alignment for heavy-duty marine propulsion systems. Designed for engines up to 439 HP at 3000 RPM (2:1 reduction), it absorbs torsional and axial vibrations through a pre-tensioned flexible rubber element, providing quiet, vibration-free power transfer without backlash. The coupling compensates for up to 2° of misalignment and ensures galvanic isolation between the engine and shaft. Its integrated thrust damper, non-tapered hub, and removable centering ring deliver exceptional durability and ease of installation.
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Vetus BULFL3270 Bullflex 32 Flexible Coupling for 70 mm Shaft
The Vetus BULFL3270 Bullflex 32 Flexible Coupling is engineered for powerful marine propulsion systems equipped with a 70 mm propeller shaft. Its unique rubber element provides superior torsional flexibility, minimizing engine-induced vibrations and noise while ensuring a smooth, backlash-free connection between the engine and the propeller shaft. Capable of handling up to 439 HP at 3000 RPM, this coupling maintains excellent shaft alignment even with up to 2° of angular misalignment, guaranteeing reliability, quiet operation, and long component life.
Key Features
- Extremely high torsional and axial flexibility for vibration damping
- Secured against shearing both axially and radially under all load conditions
- Permits shaft misalignment up to 2° without loss of centering
- Accurate shaft centering for smooth operation at all speeds
- Remains centered even during reverse gear operation
- Removable centering ring for multi-bearing or long-shaft installations
- Integrated thrust damper minimizes axial vibration and engine load
- Non-tapered clamping hub ensures precise centering and easy removal
- Provides galvanic isolation between engine and shaft to prevent corrosion
- Maintenance-free design with long operational life
Performance Ratings (at 3000 RPM)
- Gear 2:1 reduction – Maximum 439 HP
- Gear 2.5:1 reduction – Maximum 370 HP
Installation Compatibility
Without adapter: Fits directly on Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using UNISET4/5 stud and bolt set.
With adapter: For other gearbox models, adapter flanges are available (nuts and bolts included):
Adapter Flange Compatible Gearboxes FLANGE1 Yanmar KM2C, KMP2P, KM3P, Kanzaki KC30, KC45, KC100 FLANGE2 Volvo MS10A/L, MS15A/L, MS25A/L FLANGE2A Volvo MS, MSB, and all MS2 series FLANGE3 Yanmar KM4A, KM4A1, KMH4A, KBW20-1, KBW21, Kanzaki KC180
Technical Specifications
Parameter Specification Model BULFL3270 (Bullflex Type 32) Shaft Diameter Ø 70 mm Overall Diameter (D) 260 mm Height (L) 263 mm Pleasure Craft Power Ratio (DIN 6270B) 31.3 HP / 100 RPM (23.0 kW) Commercial Craft Power Ratio (DIN 6270A) 25.3 HP / 100 RPM (18.6 kW) Max Torque (Pleasure Craft) 2200 Nm Max Torque (Commercial Craft) 1780 Nm Max RPM (Zero Misalignment) 3600 RPM Max RPM (at 2° Misalignment) 1800 RPM Flange Options Combined 4″ and 5″ flanges Material High-strength marine rubber with precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 32
- Flange size: 4″ & 5″ combined
- Shaft diameter: 70 mm
- Length L: 263 mm
- Diameter D: 260 mm
Advantages of the Bullflex Coupling
- Superior vibration and torsional damping performance
- Quiet, smooth power transfer without backlash
- Excellent shaft alignment and reduced drivetrain wear
- Galvanically isolated for corrosion resistance
- Easy installation, servicing, and long lifespan in marine environments
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