what are primus cylinders

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Primus cylinders can only be operated with a Primus key.
Primus XP high security cylinders are available to add patented* key control and varying degrees of geographical exclusivity to most Schlage 6-pin key systems, whether using Everest or Classic keyw...
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.
Schlage does not offer the B250 with Primus and it cannot be ordered less cylinder.  It is possible to install a Primus cylinder as a Primus cylinder will fit into a B250 housing as long as it wa...
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.