FSIC primus in RD lock

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When you want to periodically disable and block access to a certain room in a building or an entrance door, that’s when you would need to use a Lockout Cylinder. See full document.
Refer to table 1 for the list of Schlage AL-Series cylinders.     AL-Series Cylinder Reference Table    Function  Cylinder Mechanism   Complete Cylinder   Non-Hotel Functions  ...
The Primus cylinders are not designed to fit into the F locks.  They are too long and the tailpiece is oriented differently.
The ND85/AL85/A85 hotel lock is only available in a conventional Key-in-Lever cylinder.  Interchangeable core and Primus are not available with this function. 
A Primus Hotel cylinder (as well as an IC hotel cylinder) is not possible because there isn't enough room inside the cylinder for all of the required components. 
UL437 is testing requirement that cylinders pass both a timed cylinder pick test and a forceful core/cylinder pull test.  We have various cylinders to meet this need, please reference our price boo...
 DESCRIPTION PART NUMBER   Conventional Core  23-030  Conventional Core less logo  23-031  Primus Core  20-740  Primus XP Core  20-740-XP  Primus Core less logo  20-741 ...