| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 7 | 4154 | 1950 | 55 | 120 | 12 | 290 | 235 | 115 | 5 | 175 | 114 |
The Flexible Bolt Coupling FBC 7 marks a significant increase in physical scale, moving into the heavy industrial category designed for massive shafting and high-torque demands. Utilizing a twelve-pin configuration (N=12) and a 290 mm outer diameter, it is engineered to provide a stable, high-torque connection for large-scale processing equipment.
Nominal Torque Capacity: 4,154 Nm
Maximum Speed: 1,950 RPM
Bore Diameter Range: 55 mm – 120 mm
Quantity of Pins (N): 12
Outer Diameter (A): 290 mm
Overall Length (B): 235 mm
The FBC 7 functions through twelve high-load pins distributed across a large 290 mm flange. At this size, the coupling provides immense mechanical leverage. The torque is transferred through the compression of twelve heavy-duty elastomeric bushes, which act as the interface between the driving and driven hubs.
By using twelve pins, the FBC 7 ensures that the 4,154 Nm of torque is distributed evenly, preventing localized stress on the flanges. This design is specifically focused on protecting massive machinery from the destructive effects of torsional vibration and sudden torque spikes, while the 5 mm axial gap (Dimension D) allows for the natural thermal expansion of large shafts.
Substantial Bore Capacity: Accommodates shafts up to 120 mm, fitting the large-diameter drive shafts found in heavy industry.
Extreme Load Stability: The 12-pin layout provides a highly balanced rotation, which is critical for protecting the bearings of large motors and gearboxes.
Low Maintenance Requirements: Eliminates the need for lubrication systems, reducing fire hazards and environmental contamination in heavy industrial sites.
Vibration Isolation: Effectively dampens the low-frequency vibrations typically associated with large-diameter rotating masses.
Predictable Wear: The bushes can be inspected for "set" or wear without a full teardown, allowing for cost-effective preventive maintenance.
Large-Scale Pumping Stations: Used in municipal water supply, flood control, and sewage treatment.
Primary Mining Conveyors: Powering high-tonnage belt systems for ore and coal transport.
Heavy-Duty Industrial Fans: Used in mine ventilation and large-scale industrial cooling towers.
Ball and Rod Mills: Connecting motors to the primary drive of material reduction mills.
Marine Propulsion Systems: Used in auxiliary drives and thruster assemblies for large vessels.
Lower Maximum Speed: The speed limit drops to 1,950 RPM. This is well-suited for 4-pole or 6-pole motors but must not be used for high-speed 2-pole applications.
Deep Hub Engagement (Dimension C): The 115 mm hub length requires a very long shaft and keyway to ensure the massive 4,154 Nm load is distributed safely along the shaft.
Installation Logistics: At 290 mm wide and 235 mm long, this is a heavy component. Mechanical lifting aids are mandatory for safe installation and alignment.
Shaft Alignment: While the 12-pin design is forgiving, precise alignment is vital at these torque levels to ensure even load sharing across all twelve bushes.
The Flexible Bolt Coupling FBC 7 is a heavy-duty industrial solution for applications requiring up to 4,154 Nm of torque. With its 120 mm bore capacity and 12-pin design, it provides the strength and vibration damping necessary for the most demanding large-scale industrial drives. It offers a reliable, lubrication-free alternative to gear couplings in high-torque, moderate-speed environments.
