ID
975205
$ 1,820.48
1-2 weeks delivery time
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The Vetus BULFL1212 Bullflex 12 Flexible Coupling (shaft Ø 1 ½", type 12) is a high-performance marine coupling designed for engines up to 230 HP at 3600 RPM (2:1 reduction). With a 200 mm diameter and 177 mm height, it provides exceptional torsional vibration damping and allows up to 2° shaft misalignment while maintaining perfect alignment. The robust rubber element ensures smooth, silent transmission without backlash, and the integrated thrust damper minimizes axial vibrations. Built for reliability, it includes galvanic isolation and a non-tapered clamping hub for accurate and easy installation.
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Vetus BULFL1212 Bullflex 12 Flexible Coupling for 1 ½" Shaft
The Vetus BULFL1212 Bullflex 12 Flexible Coupling is specially developed for marine propulsion systems requiring high torque capacity and exceptional vibration damping. It ensures smooth and quiet transmission between the engine and propeller shaft, even under demanding operating conditions. The pre-tensioned rubber element minimizes torsional vibrations, while the integrated centering ring guarantees precise shaft alignment. Galvanic isolation prevents corrosion between the engine and shaft.
Key Features
- Extremely high flexibility for superior vibration absorption
- Secure against axial and radial shearing for safe power transmission
- Permissible misalignment up to 2°
- Excellent shaft centering for stable, high-speed operation
- Maintains shaft alignment even in reverse gear
- Removable centering ring for multi-bearing configurations
- Built-in thrust damper reduces axial vibration
- Non-tapered clamping hub for accurate centering and easy removal
- Provides galvanic separation between engine and propeller shaft
Installation Compatibility
Without adapter: Fits directly onto 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 models FLANGE3 Yanmar KM4A, KM4A1, KMH4A, KBW20-1, KBW21, Kanzaki KC180
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 230 HP
- Gear 2.5:1 reduction – Maximum 184 HP
Technical Specifications
Parameter Specification Model BULFL1212 (Bullflex Type 12) Shaft Diameter Ø 1 ½" (35–45 mm) Overall Diameter (D) 200 mm Height (L) 177 mm 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 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) Flange Options Available with 4″ and 5″ flanges Material Marine-grade rubber and precision-machined steel Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 12
- Flange size: 4″ and 5″
- Shaft diameter: 1 ½″ (≈ 38.1 mm)
- Length L: 177 mm
- Diameter D: 200 mm
Advantages of the Bullflex Coupling
- Optimum damping of torsional vibrations
- Quiet, backlash-free power transmission
- Excellent alignment and balance under load
- Long-lasting performance with minimal maintenance
- Simple installation and serviceability
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1-2 weeks delivery time$ 108.44