Current connectors

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ST ST connectors have a bayonet mount and a long cylindrical spring-loaded ferrule to hold the fibre. Most ferrules are ceramic, but some are metal or plastic.
LC/LCAPC The LC connector uses a 1.25 mm ferrule and is approximately half the size of the SC. Otherwise, it's a standard ceramic ferrule connector, easily terminated with any adhesive. Good performance, highly favoured for singlemode.
FC/FCAPC FC/PC has been one of the most popular singlemode connectors for many years. It screws on firmly, but make sure you have the key aligned in the slot properly before tightening.
SC/SCAPC SC is a snap-in connector that is widely used in singlemode systems for its excellent performance. It's a snap-in connector that latches with a simple push-pull motion. It is also available in a duplex configuration.
Harsh environment connectors Tech Optics supplies a range of fibre optic connectors suitable for harsh environments.