Boston Gear FC20-5 8 5 8" Jaw Coupling

Description:

The Boston Gear FC20-5/8 Jaw Coupling is used in industrial power transmission systems to connect two rotating shafts and transmit torque while allowing for minor misalignment and vibration damping. Commonly installed in conveyor drives, pump assemblies, gearmotor systems, and general industrial machinery where flexible shaft coupling is required for smooth and reliable power transfer. Maintenance teams, OEM manufacturers, and system integrators use this coupling for drivetrain repair, equipment retrofit, motor-to-load connection, and replacement of worn or damaged coupling hubs.

Applications:

The Boston Gear FC20-5/8 jaw coupling is commonly used in industrial mechanical drive systems including conveyors, mixers, pumps, fans, compressors, and automated machinery where torque transmission and misalignment compensation between motor and driven equipment are required to maintain system reliability and reduce wear on connected components.

Technical Specifications:

• Manufacturer: Boston Gear (Regal Rexnord)
• Model / Part number: FC20-5/8
• Product type: Jaw coupling hub (half coupling)
• Coupling size: FC20
• Bore size: 5/8 inch
• Material: Steel / carbon steel
• Outside diameter: 2.0 inch
• Overall coupling length: 3.69 inch (assembled)
• Torque capacity: approx. 470 in-lb
• Maximum speed: up to 1750–3450 RPM (application dependent)
• Bore type: Finished bore with keyway and set screw
• Function: Flexible torque transmission with misalignment compensation
• Design: Straight jaw hub (requires elastomer insert for full coupling assembly)

Common Replacements:

• Lovejoy L-095 5/8" jaw coupling hub
• Dodge Paraflex FC20 equivalent coupling hub
• Martin FC20 5/8" jaw coupling hub