ST simplex connectors feature a 2.5 mm ferrule with a quick release bayonet.
(**)Part Code Suffix
9M = ST Singlemode 900µm (Rigid Boot)
2M = ST Singlemode 2mm (Flexible Boot)
3M = ST Singlemode 3mm (Flexible Boot)
8D = ST APC (8° Angle Polished Connector)