ID
975912
$ 666.77
1-2 weeks delivery time
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The Vetus BULFL0220 Bullflex 2 Flexible Coupling (shaft Ø 20 mm, type 2) ensures outstanding vibration damping and perfect propeller shaft alignment for small marine propulsion systems. With a 120 mm diameter and 120 mm height, it supports engines up to 36 HP at 3600 RPM (2:1 reduction). Its flexible pre-tensioned rubber element provides quiet, backlash-free power transmission, allowing up to 2° misalignment. The coupling includes a built-in thrust damper, galvanic isolation, and a non-tapered hub for easy installation, precision alignment, and smooth, vibration-free operation.
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Vetus BULFL0220 Bullflex 2 Flexible Coupling for 20 mm Shaft
The Vetus BULFL0220 Bullflex 2 Flexible Coupling is a durable and compact marine coupling designed to reduce torsional vibrations and ensure smooth power transmission between the engine and propeller shaft. Suitable for 20 mm shafts, this coupling is ideal for small to medium-sized marine engines. Its flexible rubber element efficiently absorbs vibrations, eliminating backlash and noise, while maintaining excellent alignment even with a misalignment angle of up to 2°. Built for long service life, it also ensures galvanic separation between engine and shaft, preventing corrosion and mechanical stress.
Key Features
- High flexibility for efficient vibration and noise reduction
- Axially and radially secured against shearing for safe torque transmission
- Permissible misalignment up to 2°
- Excellent shaft centering for smooth, high-speed operation
- Shaft remains centered even in reverse gear
- Removable centering ring for multi-bearing setups
- Built-in thrust damper minimizes axial vibration
- Non-tapered clamping hub ensures accurate centering and easy removal
- Provides galvanic isolation between engine and shaft
- Compact design for easy installation in confined spaces
Installation Compatibility
Without adapter: The Bullflex 2 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 36 HP
- Gear 2.5:1 reduction – Maximum 30 HP
Technical Specifications
Parameter Specification Model BULFL0220 (Bullflex Type 2) Shaft Diameter Ø 20 mm Overall Diameter (D) 120 mm Height (L) 120 mm Max Torque (Pleasure Craft) 140 Nm Max Torque (Commercial Craft) 85 Nm Max RPM (Zero Misalignment) 7000 RPM Max RPM (at 2° Misalignment) 3500 RPM Pleasure Craft Power Ratio (DIN 6270B) 2.1 HP / 100 RPM (1.6 kW) Commercial Craft Power Ratio (DIN 6270A) 1.3 HP / 100 RPM (0.9 kW) Flange Size 4″ Material Marine-grade rubber and precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 2
- Flange size: 4″
- Shaft diameter: 20 mm
- Length L: 120 mm
- Diameter D: 120 mm
Advantages of the Bullflex Coupling
- Superior damping of torsional and axial vibrations
- Quiet, backlash-free power transmission
- Perfect alignment and minimal shaft wear
- Corrosion-resistant materials and long service life
- Easy installation and service accessibility
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