ID
975919
$ 1,435.91
1-2 weeks delivery time
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The Vetus BULFL1235 Bullflex 12 Flexible Coupling (shaft Ø 35 mm, type 12) ensures superior vibration damping and accurate shaft alignment for high-performance marine propulsion systems. With a 200 mm diameter and 177 mm height, it efficiently absorbs torsional and axial vibrations, providing quiet, backlash-free operation up to 230 HP at 3600 RPM (2:1 reduction). The coupling tolerates up to 2° misalignment and offers galvanic isolation between the engine and propeller shaft. Designed with a built-in thrust damper, non-tapered clamping hub, and removable centering ring, it guarantees durability, safety, and maintenance-free operation under all conditions.
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Vetus BULFL1235 Bullflex 12 Flexible Coupling for 35 mm Shaft
The Vetus BULFL1235 Bullflex 12 Flexible Coupling provides outstanding vibration damping and precise alignment between the engine and propeller shaft for marine applications using 35 mm shafts. This high-capacity coupling uses a pre-tensioned, flexible rubber element to absorb torsional vibrations caused by engine irregularities, ensuring quiet, smooth, and backlash-free transmission. The Bullflex 12 coupling allows for up to 2° misalignment and provides galvanic isolation between the engine and propeller shaft, minimizing wear and preventing electrolysis-related corrosion. Designed for easy installation and long-term reliability, it is ideal for both pleasure and commercial vessels.
Key Features
- Very high flexibility for efficient vibration and noise damping
- Axially and radially secured against shearing for maximum safety
- Permissible shaft misalignment up to 2°
- Excellent shaft centering for stable high-speed operation
- Removable centering ring for multi-bearing applications
- Built-in thrust damper to reduce axial vibration and engine load
- Non-tapered clamping hub for precise centering and easy dismantling
- Provides galvanic isolation between engine and shaft
- Durable, maintenance-free construction for long service life
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 230 HP
- Gear 2.5:1 reduction – Maximum 184 HP
Installation Compatibility
Without adapter: The Bullflex 12 fits directly on Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using the UNISET4/5 stud and bolt set.
With adapter: For other gearboxes, 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
Technical Specifications
Parameter Specification Model BULFL1235 (Bullflex Type 12) Shaft Diameter Ø 35 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: 35 mm
- Length L: 177 mm
- Diameter D: 200 mm
Advantages of the Bullflex Coupling
- Superior damping of torsional and axial vibrations
- Quiet, backlash-free operation even under high load
- Enhanced shaft alignment and reduced drivetrain wear
- Galvanic isolation for improved corrosion protection
- Robust and low-maintenance marine-grade design
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