ID
975915
$ 976.58
1-2 weeks delivery time
-
+
The Vetus BULFL0430 Bullflex 4 Flexible Coupling (shaft Ø 30 mm, type 4) provides exceptional vibration damping and accurate propeller shaft alignment for marine propulsion systems. With a 150 mm diameter and 152 mm height, it ensures smooth, low-noise transmission between the engine and propeller shaft. Suitable for engines up to 77 HP at 3600 RPM (2:1 reduction), this coupling uses a highly flexible rubber element to absorb torsional vibrations and allows for up to 2° misalignment. It features a built-in thrust damper, galvanic isolation, and a non-tapered hub, ensuring reliable, backlash-free performance and easy installation.
- Description
- Ask a Question
-
Vetus BULFL0430 Bullflex 4 Flexible Coupling for 30 mm Shaft
The Vetus BULFL0430 Bullflex 4 Flexible Coupling is a precision-engineered marine coupling designed for 30 mm propeller shafts. It provides outstanding torsional flexibility and smooth, silent operation by effectively isolating the propeller shaft from engine vibrations. Its pre-tensioned rubber element guarantees optimal damping of torsional and axial vibrations, while maintaining perfect alignment—even under 2° of permissible misalignment. The design includes galvanic isolation between the engine and shaft, a thrust damper to reduce axial forces, and a non-tapered hub for simple installation and accurate centering.
Key Features
- High flexibility for effective vibration and noise reduction
- Secured against axial and radial shearing for maximum safety
- Allows up to 2° shaft misalignment without loss of performance
- Excellent centering accuracy at high shaft revolutions
- Removable centering ring for multi-bearing installations
- Built-in thrust damper reduces axial vibration
- Non-tapered hub ensures precise centering and easy dismantling
- Provides galvanic isolation between the engine and propeller shaft
- Constructed from corrosion-resistant, marine-grade materials
Installation Compatibility
Without adapter: The Bullflex 4 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 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
Performance Ratings (at 3600 RPM)
- Gear 2:1 reduction – Maximum 77 HP
- Gear 2.5:1 reduction – Maximum 62 HP
Technical Specifications
Parameter Specification Model BULFL0430 (Bullflex Type 4) Shaft Diameter Ø 30 mm Overall Diameter (D) 150 mm Height (L) 152 mm Max Torque (Pleasure Craft) 300 Nm Max Torque (Commercial Craft) 200 Nm Max RPM (Zero Misalignment) 6000 RPM Max RPM (at 2° Misalignment) 3000 RPM Pleasure Craft Power Ratio (DIN 6270B) 4.3 HP / 100 RPM (3.1 kW) Commercial Craft Power Ratio (DIN 6270A) 2.8 HP / 100 RPM (2.1 kW) Flange Size 4″ Material Marine-grade rubber and precision-machined steel hub Galvanic Isolation Yes
Dimensional Overview
- Type: Bullflex 4
- Flange size: 4″
- Shaft diameter: 30 mm
- Length L: 152 mm
- Diameter D: 150 mm
Advantages of the Bullflex Coupling
- Superior torsional and axial vibration damping
- Quiet, backlash-free transmission
- Precise alignment under varying loads
- Corrosion-resistant and long-lasting construction
- Simple installation and maintenance-free operation
-
Popular products
