FC Series Insert 3-Jaw Type Couplings are available in Steel and are available precision machined bored or solid hubs. The FC Series coupling offers three types of inserts for different service requirements. 

• OIL-IMPREGNATED BOST-BRONZ— Recommended for high torque loads, particularly at slower speeds.
• OIL-RESISTANT SYNTHETIC RUBBER—Recommended where quietness is desired, particularly at motor speeds.
• POLYURETHANE—Recommended where moderate to heavy shock loads are encountered.