ID
975911
$ 651.28
1-2 weeks delivery time
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The Vetus BULFL0125 Bullflex 1 Flexible Coupling (shaft Ø 25 mm, type 1) ensures optimal damping of torsional vibrations and precise propeller shaft alignment. Designed for marine engines up to 19 HP at 3600 RPM (2:1 reduction), it combines a compact 100 mm diameter and 85 mm height for smooth, quiet operation. The pre-tensioned rubber element absorbs vibrations, allowing up to 2° shaft misalignment without performance loss. This model provides galvanic isolation, a built-in thrust damper, and a non-tapered clamping hub for easy installation and perfect alignment.
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Vetus BULFL0125 Bullflex 1 Flexible Coupling for 25 mm Shaft
The Vetus BULFL0125 Bullflex 1 Flexible Coupling is designed to deliver exceptional vibration damping and smooth power transmission for small marine propulsion systems with 25 mm shafts. The pre-tensioned flexible rubber element effectively absorbs torsional and axial vibrations, ensuring quiet and backlash-free operation between the engine and propeller shaft. The built-in centering ring provides excellent shaft alignment even with a misalignment of up to 2°, while the compact design allows for easy installation in limited engine spaces.
Key Features
- Very high flexibility for optimal vibration absorption
- Axially and radially secured against shearing for safe torque transfer
- Permissible shaft misalignment up to 2°
- Excellent centering of the shaft for smooth high-RPM operation
- Removable centering ring for multi-bearing applications
- Built-in thrust damper to reduce axial vibration
- Non-tapered clamping hub for perfect alignment and easy disassembly
- Provides galvanic isolation between engine and propeller shaft
- Ensures silent and backlash-free transmission performance
Installation Compatibility
Without adapter: The Bullflex 1 fits directly on Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using the 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 models FLANGE3 Yanmar KM4A, KM4A1, KMH4A, KBW20-1, KBW21, Kanzaki KC180
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 19 HP
- Gear 2.5:1 reduction – Maximum 15 HP
Technical Specifications
Parameter Specification Model BULFL0125 (Bullflex Type 1) Shaft Diameter Ø 25 mm Overall Diameter (D) 100 mm Height (L) 85 mm Max Torque (Pleasure Craft) 75 Nm Max Torque (Commercial Craft) 45 Nm Max RPM (Zero Misalignment) 7000 RPM Max RPM (at 2° Misalignment) 3500 RPM Pleasure Craft Power Ratio (DIN 6270B) 1.1 HP / 100 RPM (0.8 kW) Commercial Craft Power Ratio (DIN 6270A) 0.7 HP / 100 RPM (0.5 kW) Flange Size 4″ Material Marine-grade rubber and precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 1
- Flange size: 4″
- Shaft diameter: 25 mm
- Length L: 85 mm
- Diameter D: 100 mm
Advantages of the Bullflex Coupling
- Excellent torsional and axial vibration damping
- Quiet, backlash-free operation
- Accurate alignment and stable shaft rotation
- Corrosion-resistant and low-maintenance design
- Simple installation and easy service access
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