FC Connector (‘F’iber ‘C’onnector)

The FC connector holds a single fiber in a standard-sized (2.5 mm) ceramic ferrule.  The connector body is made of nickel-plated brass, and features a key-aligned, threaded locking coupling nut for repeatable, reliable coupling.  The threaded coupling nut provides a secure connector even in high-vibration environments, although it takes slightly longer to connect, since it requires turning the connector instead of a simple push and click.  Some FC style connectors exhibit tunable keying, which means the connector key can be tuned to obtain the best insertion loss, or to otherwise align the fiber.

* FC-PM assemblies are available, with the FC key aligned to either the fast or slow polarization axis.  Key-aligned FC-PM assemblies are available in either wide or narrow key varieties