ST stands for Straight Tip – a quick release bayonet style Connector.

ST Connectors are among the most commonly used network connectors in networking applications. They are cylindrical with twist lock coupling,

ST stands for Straight Tip – a quick release bayonet style Connector. STs were predominant in the late 80s and early 90s.

ST ConnectorST Connectors are among the most commonly used Fiber optic connectors in networking applications. They are cylindrical with twist lock coupling, 2.5mm keyed ferrule. ST Connectors are used both short distance applications and long line systems. The ST connector has a bayonet mount and a long cylindrical Ferrule to hold the fiber. Because they are spring-loaded, you have to make sure they are seated properly. They are easily inserted and removed due to their design. If you experience high Light loss, try reconnecting. ST connectors come in two versions: ST and ST-II. These are keyed and spring-loaded. They are push-in and twist types. They are rated for 500 mating cycles. The typical Insertion Loss for matched ST connectors is 0.25 dB.

This connector offers a ceramic ferrule with a Ø127 µm bore, while another connector features a stainless steel ferrule with a Ø144 µm bore. To improve fiber-to-fiber contact, the tips of both ferrules are pre-radiused.

Both connectors are packaged with a connector cap and two strain relief boots: one for Ø900 µm tubing and one for Ø3.0 mm tubing. In addition to the included boots, a boot and crimp sleeve for Ø2 mm tubing (sold below) is also available, as well as stainless steel sleeves designed for mating connectors to stainless steel tubing.

ST Connector 02In addition to the standard Ø144 µm bore, the stainless steel ferrule connector can be drilled to accept fiber up to Ø1000 µm. Custom-drilled connectors are available on any stainless steel ferrule.

Deployed predominately in multi-mode datacoms it is most common in network environments such as campuses, corporate networks and in military applications where the quick connecting bayonet had its advantages at the time. It is typically installed into infrastructures that were built at the turn of the century; when retro-fitting, STs are typically swapped out for more cost effective SC and LC connectors.

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