| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 6A | 2932 | 2300 | 45 | 100 | 10 | 254 | 183 | 89 | 5 | 140 | 114 |
The Flexible Bolt Coupling FBC 6A is a high-capacity evolution of the FBC 6 frame. While it maintains the same physical dimensions and 100 mm maximum bore, it increases the pin count to ten pins (N=10). This adjustment raises the torque capacity to 2,932 Nm, making it an ideal "high-density" solution for heavy industrial drives that require more power without increasing the coupling's outer diameter.
Nominal Torque Capacity: 2,932 Nm
Maximum Speed: 2,300 RPM
Bore Diameter Range: 45 mm – 100 mm
Quantity of Pins (N): 10
Outer Diameter (A): 254 mm
Overall Length (B): 183 mm
The FBC 6A utilizes ten high-tensile steel pins fitted with elastomeric bushes. By increasing the number of pins within the 254 mm flange diameter, the coupling achieves a more uniform distribution of pressure across the flexible elements.
As the driving shaft delivers up to 2,932 Nm of torque, the ten bushes work in unison to compress and absorb the energy. This high pin density is particularly effective at dampening high-amplitude torsional vibrations, which are common in heavy-duty reciprocating machinery or systems with frequent load fluctuations. The design maintains the standard 5 mm axial gap (Dimension D) to ensure the shafts can "float" axially without damaging the motor bearings.
High Torque Density: Delivers nearly 3,000 Nm within the 254 mm frame, providing a significant power boost over the standard FBC 6.
Enhanced Load Smoothing: The 10-pin configuration ensures a very smooth transmission of power, reducing the "jerking" effect during high-torque startups.
Large Bore Capacity: Accommodates shafts up to 100 mm, fitting the heavy-duty drive shafts of large industrial equipment.
Maintenance-Free: No lubrication required. The bushes are designed for long life and can be inspected visually for wear.
Redundancy and Reliability: With ten pins in operation, the coupling is extremely resilient; the system can often continue to operate safely even if individual bushes begin to show wear, allowing for scheduled rather than emergency maintenance.
Heavy-Duty Processing Pumps: Used in high-pressure water injection or large-scale chemical processing.
Mining & Aggregate Conveyors: Ideal for the primary drive of heavy-duty belt conveyors carrying high-tonnage loads.
Industrial Mixing Vats: Powering large-scale agitators for high-viscosity materials.
Gearbox Output Shafts: Connecting large industrial gear reducers to secondary drive systems.
Ball Mills and Grinders: Providing a flexible, high-torque link in material reduction machinery.
Torque Capacity: Ensure the 2,932 Nm rating accounts for the application’s service factor (e.g., higher factors for shock loads or frequent reversing).
Speed Limit: The maximum speed remains 2,300 RPM. Ensure the drive motor does not exceed this rating, especially when using variable frequency drives (VFDs).
Hub Engagement (Dimension C): The 89 mm hub depth is critical for safety; ensure the shaft and keyway are fully seated to prevent localized stress on the hub.
Alignment: While the 10-pin design is robust, precise alignment during installation will maximize the lifespan of the elastomeric bushes and reduce heat buildup.
The Flexible Bolt Coupling FBC 6A is the high-performance choice for the 254 mm frame size. By utilizing a 10-pin design, it provides a massive 2,932 Nm torque capacity, offering superior vibration isolation and load-carrying ability. It is a premier solution for heavy industrial applications where shaft sizes reach 100 mm and reliability is non-negotiable.
