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What is a wide key and what is a narrow key on FC Connectors?

April 26, 2017connectors FC key narrow wide

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What is a wide key and what is a narrow key on FC Connectors?

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Narrow key connectors have a 2.0mm key and are used on and recommended for most FC connectors including UPC, APC and PM connectors. They are sometimes referred to as R Type. Wide key connectors have a 2.14mm key and are required when mating an APC connector or a PM connector to a wide key connector. They are sometimes referred to as N Type. TIA FOCIS-4, which controls the widths of the keys, calls out 4 different standards but they can be grouped into wide and narrow keys.