ID
975212
$ 3,057.70
1-2 weeks delivery time
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The Vetus BULFL3213 Bullflex 32 Flexible Coupling (shaft Ø 1 ¾", type 32) is designed for high-power marine engines up to 439 HP at 3000 RPM (2:1 reduction). With a 260 mm diameter and 263 mm height, it delivers exceptional damping of torsional and axial vibrations. The flexible rubber element ensures silent, backlash-free power transmission, while the built-in thrust damper reduces axial loads. This coupling allows up to 2° misalignment and guarantees precise shaft alignment through its centering ring. It also provides galvanic isolation and features a robust, non-tapered clamping hub for reliable and easy installation.
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Vetus BULFL3213 Bullflex 32 Flexible Coupling for 1 ¾" Shaft
The Vetus BULFL3213 Bullflex 32 Flexible Coupling is engineered for high-torque marine propulsion systems requiring optimal vibration damping and superior shaft alignment. Its advanced rubber element efficiently absorbs torsional and axial vibrations, providing smooth, noise-free, and backlash-free transmission between the engine and propeller shaft. Even with a misalignment of up to 2°, the shaft remains perfectly centered. The coupling includes galvanic isolation and a built-in thrust damper to ensure quiet, reliable, and maintenance-free operation.
Key Features
- Extremely high flexibility for effective vibration absorption
- Axially and radially secured against shearing for safe torque transmission
- Permissible shaft misalignment up to 2°
- Excellent shaft centering even at high revolutions
- Removable centering ring for multi-bearing configurations
- Built-in thrust damper minimizing axial vibrations
- Non-tapered clamping hub for accurate alignment and easy disassembly
- Provides galvanic separation between engine and propeller shaft
- Ensures silent and backlash-free transmission under all load conditions
Installation Compatibility
Without adapter: The Bullflex 32 fits directly on Hurth, Velvet, Technodrive, ZF, and P.R.M. gearboxes using the UNISET4/5 stud and bolt set.
With adapter: For other gearbox models, adapter flanges are required (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 3000 RPM)
- Gear 2:1 reduction – Maximum 439 HP
- Gear 2.5:1 reduction – Maximum 370 HP
Technical Specifications
Parameter Specification Model BULFL3213 (Bullflex Type 32) Shaft Diameter Ø 1 ¾" (≈ 44.45 mm) Overall Diameter (D) 260 mm Height (L) 263 mm Max Torque (Pleasure Craft) 2200 Nm Max Torque (Commercial Craft) 1780 Nm Max RPM (Zero Misalignment) 3600 RPM Max RPM (at 2° Misalignment) 1800 RPM Pleasure Craft Power Ratio (DIN 6270B) 31.3 HP / 100 RPM (23.0 kW) Commercial Craft Power Ratio (DIN 6270A) 25.3 HP / 100 RPM (18.6 kW) Flange Options Combined 4″ and 5″ flanges Material Marine-grade rubber and precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 32
- Flange size: Combined 4″ and 5″
- Shaft diameter: 1 ¾″ (≈ 44.45 mm)
- Length L: 263 mm
- Diameter D: 260 mm
Advantages of the Bullflex Coupling
- Superior damping of torsional and axial vibrations
- Silent, backlash-free transmission performance
- Excellent shaft centering and alignment stability
- Durable, corrosion-resistant materials for marine environments
- Easy installation and service access
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