ID
975209
$ 2,002.99
1-2 weeks delivery time
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The Vetus BULFL1613 Bullflex 16 Flexible Coupling (shaft Ø 1 ¾", type 16) is a heavy-duty flexible marine coupling engineered for engines up to 256 HP at 3000 RPM (2:1 reduction). With a 205 mm diameter and 197 mm height, it provides exceptional vibration damping and alignment accuracy. The pre-tensioned rubber element absorbs torsional vibrations and prevents backlash, ensuring quiet, smooth transmission between engine and propeller shaft. The built-in thrust damper reduces axial loads, while galvanic isolation and a non-tapered hub simplify precise installation and long-term reliability.
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Vetus BULFL1613 Bullflex 16 Flexible Coupling for 1 ¾" Shaft
The Vetus BULFL1613 Bullflex 16 Flexible Coupling is a high-performance marine shaft coupling designed to deliver superior vibration damping and long-lasting reliability in high-torque propulsion systems. Its flexible, pre-tensioned rubber element efficiently absorbs torsional and axial vibrations, ensuring quiet and backlash-free operation between the engine and propeller shaft. The coupling maintains excellent alignment, even at a 2° misalignment, while providing galvanic separation between metal components for improved corrosion resistance.
Key Features
- Exceptional flexibility for optimal vibration damping
- Axially and radially secured against shearing for safe transmission
- Allows up to 2° shaft misalignment
- Excellent shaft centering, enabling high rotational speeds
- Shaft remains perfectly aligned even in reverse gear
- Removable centering ring for multi-bearing installations
- Built-in thrust damper reduces axial vibrations
- Non-tapered clamping hub for accurate centering and easy dismantling
- Provides galvanic isolation between engine and propeller shaft
Installation Compatibility
Without adapter: The Bullflex 16 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 types, 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 models FLANGE3 Yanmar KM4A, KM4A1, KMH4A, KBW20-1, KBW21, Kanzaki KC180
Performance Ratings (at 3000 RPM)
- Gear 2:1 reduction – Maximum 256 HP
- Gear 2.5:1 reduction – Maximum 205 HP
Technical Specifications
Parameter Specification Model BULFL1613 (Bullflex Type 16) Shaft Diameter Ø 1 ¾" (≈ 44.45 mm) Overall Diameter (D) 205 mm Height (L) 197 mm Max Torque (Pleasure Craft) 1200 Nm Max Torque (Commercial Craft) 935 Nm Max RPM (Zero Misalignment) 4000 RPM Max RPM (at 2° Misalignment) 2000 RPM Pleasure Craft Power Ratio (DIN 6270B) 17.1 HP / 100 RPM (12.6 kW) Commercial Craft Power Ratio (DIN 6270A) 13.3 HP / 100 RPM (9.8 kW) Flange Options Combined 4″ and 5″ flanges Material Marine-grade rubber and precision-machined steel Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 16
- Flange size: Combined 4″ and 5″
- Shaft diameter: 1 ¾″ (≈ 44.45 mm)
- Length L: 197 mm
- Diameter D: 205 mm
Advantages of the Bullflex Coupling
- Outstanding damping of torsional and axial vibrations
- Silent, backlash-free power transmission
- Perfect alignment even with slight misalignment
- Durable, corrosion-resistant, and low-maintenance design
- Easy installation with excellent service accessibility
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