| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 7A | 5195 | 1900 | 55 | 125 | 14 | 300 | 235 | 115 | 5 | 185 | 130 |
The Flexible Bolt Coupling FBC 7A is a specialized high-capacity variant of the FBC 7 frame. By increasing the pin density to fourteen pins (N=14) and slightly expanding the outer diameter to 300 mm, it achieves a torque rating of 5,195 Nm. This model is designed for heavy-duty industrial systems that require massive torque transmission within a controlled footprint.
Nominal Torque Capacity: 5,195 Nm
Maximum Speed: 1,900 RPM
Bore Diameter Range: 55 mm – 125 mm
Quantity of Pins (N): 14
Outer Diameter (A): 300 mm
Overall Length (B): 235 mm
The FBC 7A utilizes fourteen high-tensile steel pins (N=14) fitted with elastomeric bushes. This high pin count is critical for managing the 5,195 Nm load; by spreading the force across fourteen points of contact, the coupling reduces the pressure on each individual bush, significantly extending the service life of the flexible elements.
As the driving shaft rotates, the torque is transferred via the compression of these fourteen bushes. This design provides exceptional torsional resilience, making it highly effective at absorbing the shock loads generated by heavy machinery startup or sudden material jams in processing equipment. The 5 mm axial gap (Dimension D) is maintained to protect motor bearings from axial thrust.
High-Torque Specialization: Engineered to handle over 5,000 Nm, making it one of the strongest couplings in the 300 mm class.
Increased Bore Support: Accommodates shafts up to 125 mm, fitting the heavy-duty drive shafts of high-output industrial motors.
Superior Vibration Dampening: The 14-pin configuration provides a high degree of "softness" in the drive train, effectively isolating high-frequency vibrations.
Redundancy and Safety: With fourteen pins, the system has high operational redundancy; the wear of a single bush has a negligible impact on the overall drive integrity.
Zero Lubrication: Like the entire FBC range, it operates dry, eliminating the maintenance costs and environmental risks associated with greased couplings.
Heavy-Duty Slurry Pumps: Used in mining and dredging operations where high torque and abrasive environments are standard.
Large Industrial Mixers: Powering massive agitators in the chemical, rubber, and polymer industries.
Primary Crushers: Ideal for the drive side of stone and mineral crushers where shock loads are extreme.
High-Capacity Conveyors: Used in port terminals and mining sites for high-tonnage bulk material handling.
Water Treatment Turbines: Connecting large motors to high-volume water processing equipment.
Speed Limits: The maximum speed is 1,900 RPM. It is designed primarily for 4-pole, 6-pole, and 8-pole motors.
Hub Engagement (Dimension C): The 115 mm hub length is substantial. Ensure the shaft has a long, deep keyway to safely transfer the 5,195 Nm load without risking shaft or key failure.
Installation Logistics: Due to the 300 mm diameter and high torque capacity, this unit is heavy. Use appropriate rigging and alignment tools (such as laser alignment) to ensure even load distribution across all 14 pins.
Bush Inspection: While highly durable, the 14 bushes should be part of a regular preventive maintenance schedule to ensure the elastomer hasn't hardened or taken a permanent "set" due to extreme heat or chemical exposure.
The Flexible Bolt Coupling FBC 7A is a heavy-duty powerhouse, offering a massive 5,195 Nm torque capacity and supporting bores up to 125 mm. By utilizing a 14-pin design, it provides the ultimate level of vibration isolation and load-carrying ability for large-scale industrial machinery where reliability and downtime prevention are the highest priorities.
