ID
975910
$ 651.28
1-2 weeks delivery time
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The Vetus BULFL0120 Bullflex 1 Flexible Coupling (shaft Ø 20 mm, type 1) provides excellent vibration damping and alignment precision for small marine propulsion systems up to 19 HP at 3600 RPM (2:1 reduction). With a compact 100 mm diameter and 85 mm height, this coupling ensures quiet, backlash-free transmission through its flexible rubber element. It allows up to 2° misalignment while maintaining perfect centering. The built-in thrust damper minimizes axial vibrations, and the coupling features galvanic isolation, a removable centering ring, and a non-tapered hub for quick, precise installation.
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Vetus BULFL0120 Bullflex 1 Flexible Coupling for 20 mm Shaft
The Vetus BULFL0120 Bullflex 1 Flexible Coupling is a compact, high-performance flexible coupling designed for small marine engines using 20 mm propeller shafts. It effectively reduces torsional vibrations, ensuring smooth, silent, and backlash-free power transmission between the engine and the propeller shaft. The pre-tensioned rubber element provides outstanding vibration absorption, while the built-in centering ring guarantees precise shaft alignment even at a 2° misalignment angle. Its lightweight yet durable construction ensures long service life and reliable operation.
Key Features
- Very high flexibility for superior vibration damping
- Axially and radially secured against shearing for safe power transmission
- Allows up to 2° shaft misalignment
- Excellent shaft centering for stable high-speed rotation
- Shaft remains perfectly centered even in reverse gear
- Removable centering ring for multi-bearing configurations
- Built-in thrust damper minimizes axial vibrations
- Non-tapered clamping hub ensures accurate centering and easy dismantling
- Provides galvanic isolation between engine and propeller shaft
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 BULFL0120 (Bullflex Type 1) Shaft Diameter Ø 20 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 with precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 1
- Flange size: 4″
- Shaft diameter: 20 mm
- Length L: 85 mm
- Diameter D: 100 mm
Advantages of the Bullflex Coupling
- Outstanding damping of torsional and axial vibrations
- Quiet, backlash-free operation
- Perfect alignment and balance even under load
- Corrosion-resistant materials for long service life
- Simple installation and easy servicing
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