ID
975921
$ 1,435.91
1-2 weeks delivery time
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The Vetus BULFL1245 Bullflex 12 Flexible Coupling (shaft Ø 45 mm, type 12) is engineered for superior vibration damping and precise shaft alignment in high-performance marine propulsion systems. With a 200 mm diameter and 177 mm height, it supports engines up to 230 HP at 3600 RPM (2:1 reduction). Its highly flexible pre-tensioned rubber element effectively absorbs torsional and axial vibrations, ensuring quiet, smooth, and backlash-free operation. The coupling allows up to 2° shaft misalignment and offers galvanic isolation between engine and shaft. Featuring a non-tapered clamping hub, built-in thrust damper, and removable centering ring, it ensures safe transmission, ease of maintenance, and long-lasting reliability.
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Vetus BULFL1245 Bullflex 12 Flexible Coupling for 45 mm Shaft
The Vetus BULFL1245 Bullflex 12 Flexible Coupling is a heavy-duty marine drivetrain component designed to ensure vibration-free power transmission and precise shaft alignment for vessels equipped with 45 mm propeller shafts. Its pre-tensioned, highly flexible rubber element absorbs torsional and axial vibrations efficiently, delivering quiet and smooth operation even under fluctuating load conditions. The coupling allows up to 2° of shaft misalignment without loss of performance and provides full galvanic isolation between engine and propeller shaft to prevent electrolysis and wear.
Key Features
- High torsional flexibility for effective vibration and noise reduction
- Axially and radially secured to prevent shearing under all load conditions
- Permissible misalignment up to 2°
- Excellent centering accuracy at high RPMs
- Shaft remains perfectly aligned even in reverse gear
- Removable centering ring for multi-bearing configurations
- Integrated thrust damper minimizes axial vibrations
- Non-tapered clamping hub ensures accurate alignment and easy removal
- Galvanic isolation between engine and propeller shaft
- Maintenance-free and corrosion-resistant design
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 230 HP
- Gear 2.5:1 reduction – Maximum 184 HP
Installation Compatibility
Without adapter: Fits directly on Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using UNISET4/5 stud and bolt set.
With adapter: For other gearbox types, use dedicated adapter flanges (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
Technical Specifications
Parameter Specification Model BULFL1245 (Bullflex Type 12) Shaft Diameter Ø 45 mm Overall Diameter (D) 200 mm Height (L) 177 mm Pleasure Craft Power Ratio (DIN 6270B) 12.8 HP / 100 RPM (9.8 kW) Commercial Craft Power Ratio (DIN 6270A) 9.6 HP / 100 RPM (7.1 kW) Max Torque (Pleasure Craft) 900 Nm Max Torque (Commercial Craft) 540 Nm Max RPM (Zero Misalignment) 4000 RPM Max RPM (at 2° Misalignment) 2000 RPM Flange Options Combined 4″ and 5″ flanges Material Marine-grade rubber with precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 12
- Flange size: 4″ & 5″ combined
- Shaft diameter: 45 mm
- Length L: 177 mm
- Diameter D: 200 mm
Advantages of the Bullflex Coupling
- Superior vibration and noise reduction
- Backlash-free torque transmission and stable alignment
- Corrosion resistance through galvanic isolation
- Long-lasting, low-maintenance design for marine environments
- Simple installation, high reliability, and consistent performance
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