ID
975913
$ 666.77
1-2 weeks delivery time
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The Vetus BULFL0225 Bullflex 2 Flexible Coupling (shaft Ø 25 mm, type 2) ensures outstanding damping of vibrations and precise propeller shaft alignment. Designed for engines up to 36 HP at 3600 RPM (2:1 reduction), it combines a durable 120 mm diameter with a 120 mm height for optimal performance. Its highly flexible rubber element absorbs torsional and axial vibrations, guaranteeing smooth, quiet transmission and up to 2° permissible misalignment. The unit features galvanic isolation, a built-in thrust damper, and a non-tapered hub for precise alignment and easy installation.
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Vetus BULFL0225 Bullflex 2 Flexible Coupling for 25 mm Shaft
The Vetus BULFL0225 Bullflex 2 Flexible Coupling is specifically engineered to deliver high performance, durability, and precise vibration control for marine propulsion systems using 25 mm shafts. Its pre-tensioned rubber element efficiently absorbs torsional and axial vibrations, providing quiet, backlash-free power transmission between the engine and the propeller shaft. The special centering ring ensures accurate shaft alignment, while the design allows up to 2° misalignment without performance loss. The built-in thrust damper minimizes axial loads, ensuring long service life and reliable operation even under challenging conditions.
Key Features
- Exceptional flexibility for superior vibration absorption
- Axially and radially secured against shearing for safe torque transfer
- Permissible shaft misalignment up to 2°
- Excellent shaft centering, maintaining perfect balance at high RPMs
- Removable centering ring for multi-bearing systems
- Built-in thrust damper to reduce axial vibrations
- Non-tapered clamping hub for easy alignment and removal
- Galvanic isolation between engine and propeller shaft
- Durable marine-grade construction for long service life
Installation Compatibility
Without adapter: The Bullflex 2 mounts directly on 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 36 HP
- Gear 2.5:1 reduction – Maximum 30 HP
Technical Specifications
Parameter Specification Model BULFL0225 (Bullflex Type 2) Shaft Diameter Ø 25 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: 25 mm
- Length L: 120 mm
- Diameter D: 120 mm
Advantages of the Bullflex Coupling
- Superior damping of torsional and axial vibrations
- Silent, backlash-free power transmission
- Perfect shaft alignment and reduced mechanical wear
- Corrosion-resistant construction for marine environments
- Quick installation and low maintenance requirements
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