| Coupling Size | Torque Nm | Max. Speed (RPM) | Bore Dia MIN | Bore Dia MAX | QTY N | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FBC 2 | 310 | 5100 | 12.7 | 35 | 4 | 114 | 99 | 48 | 3 | 51 | 70 |
The Flexible Bolt Coupling FBC 2 is a robust, pin-and-bush type coupling designed for applications requiring higher torque capacity than the FBC 1 while maintaining high rotational stability. It serves as a critical link in power transmission, absorbing shock loads and protecting connected machinery from the damaging effects of vibration and misalignment.
Nominal Torque Capacity: 310 Nm
Maximum Speed: 5,100 RPM
Bore Diameter Range: 12.7 mm – 35 mm
Quantity of Pins (N): 4
Outer Diameter (A): 114 mm
Overall Length (B): 99 mm
The FBC 2 utilizes a four-pin configuration to transmit torque. It features two precision-machined flanges connected by steel pins encased in elastomeric bushes. As the driving shaft rotates, the torque is transferred to the driven shaft through the compression of these flexible bushes.
By using four pins instead of three, the FBC 2 provides a more balanced distribution of force across the coupling face. This design allows it to act as a vibration damper and a mechanical buffer, accommodating angular, parallel, and axial misalignments without transmitting excessive stress to the motor or gearbox bearings.
Enhanced Torque Density: Offers a significant jump in power capacity (310 Nm) over the base model, allowing for use in heavier machinery.
Fail-Safe Operation: The pin-and-bush design ensures that even if the bushes wear out, the pins provide a secondary (though noisy) drive connection to prevent immediate system decoupling.
No Lubrication Required: The elastomeric elements eliminate the need for grease or oil, making it ideal for clean environments and reducing maintenance overhead.
Shock Absorption: The increased mass and four-pin layout provide excellent damping for systems prone to sudden start-stop cycles or intermittent load spikes.
Standardized Fitting: With a maximum bore of 35 mm, it fits a wide range of standard metric and imperial shafting.
Medium-Sized Centrifugal Pumps: Suitable for industrial water processing and irrigation systems.
Industrial Fans & Exhausters: Used in larger ventilation units where balanced high-speed rotation is required.
Conveyor Drive Systems: Ideal for belt and roller conveyors in logistics centers and manufacturing plants.
Reciprocating Compressors: Effectively dampens the pulsating torque generated by piston-driven equipment.
Mixers and Agitators: Used in chemical processing where steady torque and misalignment tolerance are essential.
Torque Rating: Confirm the application's service factor; the 310 Nm rating should cover peak startup torques.
Speed Limits: Ensure the operating environment does not exceed 5,100 RPM to maintain the integrity of the coupling.
Bore Compatibility: Ensure shaft diameters are between 12.7 mm and 35 mm.
Bush Inspection: Periodically check the "QTY 4" bushes for signs of compression set or cracking. Replacing bushes is a cost-effective way to renew the coupling without replacing the entire unit.
Environmental Factors: High ambient temperatures or exposure to harsh chemicals should be cross-referenced with the elastomer type used in the FBC 2 bushes.
The Flexible Bolt Coupling FBC 2 is a high-performance upgrade for systems requiring up to 310 Nm of torque. With its 114 mm outer diameter and 5,100 RPM speed rating, it offers a perfect balance of strength and flexibility. It is an industry-standard choice for protecting medium-duty pumps, fans, and motors from the mechanical wear caused by vibration and shaft misalignment.
