SC is a snap-in connector also with a 2.5 mm ferrule that is widely used for it’s excellent performance.It was the connector standardized in TIA-568-A, but was not widely used at first because it was twice as expensive as a ST. Now it’s only a bit more expensive and much more common It’s a snap-in connector that latches with a simple push-pull motion. It is also available in a duplex configuration.