| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 6B | 3533 | 2300 | 45 | 100 | 12 | 254 | 183 | 89 | 5 | 140 | 114 |
The Flexible Bolt Coupling FBC 6B is the ultimate torque-density variant in the 254 mm frame size. By maximizing the pin count to twelve pins (N=12), it offers a massive 3,533 Nm of torque capacity within the same physical dimensions as the 6 and 6A models. This makes it the premier choice for applications requiring extreme torque transmission and superior vibration damping without expanding the coupling's spatial footprint.
Nominal Torque Capacity: 3,533 Nm
Maximum Speed: 2,300 RPM
Bore Diameter Range: 45 mm – 100 mm
Quantity of Pins (N): 12
Outer Diameter (A): 254 mm
Overall Length (B): 183 mm
The FBC 6B utilizes twelve high-tensile steel pins (N=12), the maximum number of pins available for this specific flange diameter. This design ensures that the high torque load is distributed across the greatest possible number of elastomeric bushes, minimizing the pressure on any individual component.
As the driving flange transmits 3,533 Nm, the twelve bushes provide a "heavy-duty" cushioning effect. This configuration is exceptionally effective at absorbing extreme shock loads and isolating the drive motor from high-frequency torsional oscillations. Like the rest of the series, the FBC 6B maintains a 5 mm axial gap (Dimension D) to allow for shaft expansion and axial float.
Maximum Torque Capacity: Provides the highest power rating for the 254 mm frame size, allowing for high-horsepower transmission in restricted spaces.
Exceptional Vibrational Damping: The 12-pin layout creates a highly resilient interface, perfect for machines with severe vibration or pulsating loads.
Large Bore Support: Accommodates shafts up to 100 mm, standard for heavy-duty industrial motors and output shafts.
No-Lubrication Maintenance: The elastomeric elements eliminate the need for grease, reducing the risk of contamination and lowering maintenance requirements.
High Operational Security: With twelve pins, the coupling provides significant redundancy; the wear or failure of a single bush does not compromise the immediate integrity of the drive.
Heavy-Duty Reciprocating Pumps: Ideal for managing the pulsating torque of high-pressure piston pumps.
Mining Crushers: Suitable for secondary crushers where high torque and frequent shock loads are expected.
Primary Conveyor Drives: Powering massive material handling systems in cement, coal, or ore processing.
Large Industrial Mixers: Driving high-viscosity chemical or rubber blending equipment.
Steel Processing Equipment: Used in heavy-duty rolling and slitting lines.
Torque Load Calculation: With a 3,533 Nm capacity, it is vital to calculate the service factor accurately, especially for high-inertia starts or reversing applications.
Speed Verification: Despite its high torque, the speed limit is 2,300 RPM. It is not suitable for 2-pole high-speed motors but is perfect for 4-pole and 6-pole industrial motors.
Shaft Engagement (Dimension C): The 89 mm hub length is critical. Ensure the shaft is inserted fully and the keyway is properly sized to handle the 3,533 Nm load.
Precision Alignment: While the 12-pin design is highly flexible, precise laser alignment during installation will significantly extend the life of the twelve elastomeric bushes.
The Flexible Bolt Coupling FBC 6B is the high-torque champion of the 254 mm series. By utilizing a 12-pin configuration, it delivers a staggering 3,533 Nm torque capacity and supports bores up to 100 mm. It is the ideal solution for heavy industrial machinery that demands the highest levels of reliability, shock absorption, and power transmission density.
