ID
975914
$ 976.58
1-2 weeks delivery time
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The Vetus BULFL0425 Bullflex 4 Flexible Coupling (shaft Ø 25 mm, type 4) ensures optimum vibration damping and precise shaft alignment for marine propulsion systems. Designed for engines up to 77 HP at 3600 RPM (2:1 reduction), it features a 150 mm diameter and 152 mm height, providing smooth, quiet, and backlash-free transmission. The flexible pre-tensioned rubber element absorbs torsional vibrations and allows up to 2° misalignment without compromising performance. Built with galvanic isolation, a thrust damper, and a non-tapered hub, it guarantees accurate alignment, low maintenance, and reliable long-term operation.
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Vetus BULFL0425 Bullflex 4 Flexible Coupling for 25 mm Shaft
The Vetus BULFL0425 Bullflex 4 Flexible Coupling is a compact, high-performance marine coupling designed for 25 mm propeller shafts. Its advanced rubber element provides excellent torsional and axial vibration absorption, ensuring quiet and smooth operation with zero backlash. The integrated centering ring guarantees perfect alignment of the propeller shaft, while the coupling’s flexibility allows up to 2° of misalignment without reducing performance. This coupling also provides galvanic separation between the engine and propeller shaft, extending system longevity and preventing corrosion.
Key Features
- Very high flexibility for effective vibration damping
- Axially and radially secured against shearing for safe torque transfer
- Permissible misalignment up to 2°
- Excellent shaft centering for stable high-RPM operation
- Shaft remains centered even in reverse gear
- Removable centering ring for multi-bearing configurations
- Built-in thrust damper to minimize axial vibration
- Non-tapered clamping hub for precise centering and easy disassembly
- Provides galvanic isolation between engine and shaft
- Durable, corrosion-resistant construction for long service life
Installation Compatibility
Without adapter: The Bullflex 4 fits directly onto Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using the UNISET4/5 stud and bolt set.
With adapter: For other gearbox types, 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
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 77 HP
- Gear 2.5:1 reduction – Maximum 62 HP
Technical Specifications
Parameter Specification Model BULFL0425 (Bullflex Type 4) Shaft Diameter Ø 25 mm Overall Diameter (D) 150 mm Height (L) 152 mm Max Torque (Pleasure Craft) 300 Nm Max Torque (Commercial Craft) 200 Nm Max RPM (Zero Misalignment) 6000 RPM Max RPM (at 2° Misalignment) 3000 RPM Pleasure Craft Power Ratio (DIN 6270B) 4.3 HP / 100 RPM (3.1 kW) Commercial Craft Power Ratio (DIN 6270A) 2.8 HP / 100 RPM (2.1 kW) Flange Size 4″ Material Marine-grade rubber with precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 4
- Flange size: 4″
- Shaft diameter: 25 mm
- Length L: 152 mm
- Diameter D: 150 mm
Advantages of the Bullflex Coupling
- Superior damping of torsional and axial vibrations
- Quiet, backlash-free power transmission
- Precision alignment under all load conditions
- Corrosion-resistant, low-maintenance design
- Quick and straightforward installation
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