ST Fiber Optic Connector

ST is the abbreviation of “Stab & Twist”. ST fiber optic connector has a bayonet mount, and a 2.5 mm long cylinder of ceramic (common) or polymer ferrule to accommodate the entire fiber. The installation method is similar to a snap-on light bulb, and it is inserted and rotated half a turn to the bayonet. The core of the ST connector is exposed.
The ST fiber optic connector was developed by AT&T, and its main parameters are equivalent to those of FC and SC connectors. It is usually used in multi-mode device connections, and is often used in ODF(optical distribution frames). For 10Base-F connections, the connector is usually ST type.

Connector Type


Connector Boot Color

Blue, Green, Beige

Connector Boot Aperture (MM)

0.9 or 2.0 or 3.0

UPC Endface Concentricity (MM)


Connector Endface


Ceramic Ferrule OD (MM)


Ceramic Ferrule ID (MM)


Ceramic Ferrule Stiffiness (HV)


Ceramic Bending Strength (MPA)


Temperature Range


-40℃ to 70℃ (-40°F to 158°F )


-40℃ to 85℃ (-22°F to 185°F )


-40℃ to 85℃ (-40°F to 185°F )

Mechanical Properties

Insertion Loss (dB)

Typical Values≤0.2; Max Values≤0.3

Mating (times)

Max Values≤0.2; ≥1000

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