| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 6 | 2359 | 2300 | 45 | 100 | 8 | 254 | 183 | 89 | 5 | 140 | 114 |
Gemini said The Flexible Bolt Coupling FBC 6 marks the entry into the large-scale industrial category of the FBC series. Featuring an eight-pin configuration (N=8) and a substantial increase in torque capacity to 2,359 Nm, it is engineered for heavy machinery where reliability and high-load dampening are the primary requirements.
Nominal Torque Capacity: 2,359 Nm
Maximum Speed: 2,300 RPM
Bore Diameter Range: 45 mm – 100 mm
Quantity of Pins (N): 8
Outer Diameter (A): 254 mm
Overall Length (B): 183 mm
The FBC 6 utilizes eight high-tensile steel pins distributed around a 254 mm diameter flange. This high pin count ensures that the 2,359 Nm of torque is spread across a large surface area of elastomeric bushes, reducing the stress on any single point and extending the service life of the flexible elements.
By utilizing the compression of these eight bushes, the coupling acts as a torsional damper. It is specifically designed to handle the massive inertia of large industrial rotors while protecting the drive motor from the back-EMF and mechanical shocks caused by sudden load changes or shaft misalignments.
Significant Bore Capacity: Accommodates large-diameter shafts up to 100 mm, making it suitable for high-power industrial motors and primary drive shafts.
Superior Load Distribution: The 8-pin design provides a very stable and balanced torque transfer, minimizing radial loads on the machine bearings.
Maintenance-Free Design: Like all FBC models, the FBC 6 requires no lubrication, making it ideal for use in remote or hard-to-access locations.
High Misalignment Tolerance: Effectively manages angular and parallel offsets, protecting expensive mechanical seals from premature failure.
Fail-Safe Reliability: The multi-pin arrangement ensures that even if one bush begins to degrade, the remaining seven pins maintain the drive connection until scheduled maintenance can occur.
Primary Slurry & Water Pumps: Used in large-scale mining operations and municipal pumping stations.
Heavy Conveyor Drives: Powering massive belt systems in the aggregate and coal industries.
Industrial Kilns and Dryers: Driving large rotating drums in cement or chemical processing.
Large Cooling Tower Fans: Suitable for the high-torque, low-RPM requirements of massive industrial air coolers.
Steel Mill Equipment: Used in rolling mills and heavy-duty material handling where shock loads are frequent.
Speed Ceiling: The maximum speed is 2,300 RPM. This is designed for 4-pole, 6-pole, and 8-pole motors. It must not be used on high-speed 2-pole motors (3000+ RPM).
Hub Engagement (Dimension C): The 89 mm hub length requires a long shaft and keyway to ensure the massive torque is transferred safely without shearing the key.
Installation Weight: Given the 254 mm diameter and 183 mm length, this coupling is heavy. Proper lifting equipment and shaft support should be used during installation.
Axial Gap (Dimension D): A 5 mm gap must be maintained between the flanges to prevent metal-to-metal contact during axial shaft float.
The Flexible Bolt Coupling FBC 6 is a heavy-duty powerhouse designed for the most demanding industrial environments. With an 8-pin design and 2,359 Nm capacity, it provides the strength and vibration isolation required for large-scale processing equipment. Supporting bores up to 100 mm, it is the industry standard for high-torque, reliable power transmission.
