ID
975206
$ 1,820.48
1-2 weeks delivery time
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The Vetus BULFL1213 Bullflex 12 Flexible Coupling (shaft Ø 1 ¾", type 12) is a heavy-duty marine coupling engineered for engines up to 230 HP at 3600 RPM (2:1 reduction). With a 200 mm diameter and 177 mm height, it ensures exceptional damping of torsional vibrations and allows up to 2° shaft misalignment. The pre-tensioned rubber element provides smooth, noise-free power transfer, while the built-in thrust damper minimizes axial vibration. Designed for maximum reliability, it features galvanic isolation, a removable centering ring, and a non-tapered clamping hub for perfect alignment and easy installation.
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Vetus BULFL1213 Bullflex 12 Flexible Coupling for 1 ¾" Shaft
The Vetus BULFL1213 Bullflex 12 Flexible Coupling is a high-performance marine coupling designed to ensure smooth, vibration-free power transmission between the engine and propeller shaft. It effectively absorbs torsional and axial vibrations through its flexible, pre-tensioned rubber element. The coupling allows up to 2° misalignment while maintaining perfect shaft centering, resulting in quiet, backlash-free operation and reduced mechanical wear. A built-in thrust damper and galvanic isolation enhance both durability and safety.
Key Features
- High flexibility for optimal vibration damping
- Axially and radially secured to prevent shearing
- Permissible shaft misalignment up to 2°
- Excellent centering for stable high-speed performance
- Maintains shaft alignment even in reverse gear
- Removable centering ring for multi-bearing applications
- Built-in thrust damper to minimize axial vibration
- Non-tapered clamping hub for easy installation and dismantling
- Provides galvanic separation between engine and shaft
Installation Compatibility
Without adapter: The Bullflex 12 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 BULFL1213 (Bullflex Type 12) Shaft Diameter Ø 1 ¾" (≈ 44.45 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 with precision steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 12
- Flange size: 4″ and 5″
- Shaft diameter: 1 ¾″ (≈ 44.45 mm)
- Length L: 177 mm
- Diameter D: 200 mm
Advantages of the Bullflex Coupling
- Outstanding damping of torsional and axial vibrations
- Quiet, backlash-free operation under all load conditions
- Accurate alignment and long-lasting performance
- Ideal for high-torque marine engines
- Simple installation and easy maintenance
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