| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 8 | 5816 | 1850 | 60 | 135 | 16 | 310 | 255 | 125 | 5 | 200 | 130 |
The Flexible Bolt Coupling FBC 8 is a heavy-duty power transmission solution designed for large-scale industrial machinery. It transitions the series into a higher torque bracket, utilizing a sixteen-pin configuration (N=16) to manage a nominal torque of 5,816 Nm. This model is built for reliability in high-load environments where vibration damping and shaft protection are critical.
Nominal Torque Capacity: 5,816 Nm
Maximum Speed: 1,850 RPM
Bore Diameter Range: 60 mm – 135 mm
Quantity of Pins (N): 16
Outer Diameter (A): 310 mm
Overall Length (B): 255 mm
The FBC 8 employs sixteen high-tensile steel pins, each fitted with an elastomeric bush, arranged around a 310 mm diameter flange. By utilizing sixteen pins, the coupling maximizes the contact surface area between the driving and driven components.
As the drive system transmits nearly 6,000 Nm of torque, the load is distributed across all 16 bushes. This high pin density ensures that the elastomer operates within its optimal compression range, providing a high degree of torsional flexibility. This allows the coupling to absorb massive shock loads and accommodate axial, parallel, and angular misalignments without stressing the bearings of the connected motor or gearbox.
High Pin Redundancy: With 16 pins, the coupling is exceptionally reliable; the gradual wear of individual bushes does not cause immediate failure, allowing for planned maintenance.
Expansive Bore Range: Supports massive shafts up to 135 mm, making it compatible with the largest standard industrial electric motors.
Enhanced Vibration Damping: The large volume of elastomeric material across 16 points of contact effectively "tunes out" harmful harmonic vibrations in the drive string.
Maintenance-Free Operation: Requires no grease or oil lubrication, which is particularly beneficial in dusty or abrasive environments like mining or cement production.
Robust Construction: The 310 mm flange provides the structural rigidity required to handle high-inertia starts.
Primary Mine Dewatering Pumps: Reliability in continuous, high-torque pumping environments.
Large Grinding Mills: Used in the drive assembly for secondary ball mills or SAG mills.
Heavy-Duty Fans: Powering large-scale kiln fans or industrial ventilation systems in steel mills.
Main Drive Conveyors: Ideal for high-tonnage overland conveyor systems.
Industrial Shredders: Absorbing the violent shock loads associated with metal or timber recycling.
Rotational Speed: The maximum speed is 1,850 RPM. This makes it ideal for 4-pole, 6-pole, or 8-pole motors but restricts its use with high-speed turbine drives.
Hub Engagement (Dimension C): The 125 mm hub length is significant. Ensure the shaft extension is sufficient to allow the key to take the full 5,816 Nm load safely.
Axial Gap (Dimension D): A 5 mm gap must be maintained between the hubs to allow for axial float and to prevent "end-bumping" during thermal expansion of the shafts.
Installation Weight: At this scale, the coupling components are heavy. Use mechanical lifting aids and ensure precision alignment to prevent uneven bush wear.
The Flexible Bolt Coupling FBC 8 is a premier choice for heavy industrial applications requiring up to 5,816 Nm of torque. Its 16-pin design and 135 mm bore capacity provide a perfect blend of power, durability, and vibration isolation. It serves as a robust, lubrication-free alternative to metal-grid or gear couplings for large-scale industrial drives.
