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With APC ferrules, we have an angled surface that MUST be oriented in a specific location relative to the connector key (if not, then two angled connectors would never mate together when connected).  Any rotational deviation from this angle-to-key orientation is known as Key Error.   Causes of Key Error can be difficult to identify.

Key Error is most commonly the result of the polishing fixture key width being significantly larger than the connector key width.  It can also be the result of poor-quality connector components (usually plastic housings) which do not hold the ferrule solidly in the proper orientation relative to the connector’s key.

 

READ THE BLOG: Polished Connector Geometries, APC

 

Additional resources from the FOC team include:

 

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Kathleen Skelton

About Kathleen Skelton

Kathleen Skelton, as FOC's Director of Strategic Marketing, utilizes her expertise in business development, online strategy, market planning, digital best practices, standard operating procedure development, and content management. A graduate of Curry College, she holds degrees in Communications and Education, English and Psychology. Kathleen resides outside of Boston, MA with her husband and four children. Follow @KATHLEENSKELTON