what Primus keyways will also work with classic keyways

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The 40-100 is a multiple tailpiece pack with a pre-assembled, 0-bitted, key-in-knob cylinder.  The kit includes the following: (1) Pre-assembled cylinder 0-bitted, less tailpiece 40-100 (...
The pack is available in all keyways, Everest and Classic families including restricted keyways except Primus. 
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...
  Part Number Level  Classic Primus 40-061 1  40-065 1 Plus  40-062 2  Classic Primus XP 40-061-XP 1 40-065-XP 1 Plus  40-062-XP 2 Everest Primus 40-06...
It is not possible to key SFIC and standard cylinders including Schlage FSIC into the same system.  A keyway name may be shared between the two key fami...
HIGH SECURITY Primus/Primus XP: In addition to six cuts for standard locking mechanism, there are five side finger pins to operate the secondary sidebar lock. Primus keys will operate non-Primus l...
A Primus key can operate a non Primus cylinder as long as the keyway is the same or the key is a multi-section.  Additionally, the cylinder must be pinned to be operated by the top cuts of the Prim...
Key-in-lever tailpieces differ in length depending on the lock series, function, and design.  Click here to identify the tailpiece and length.  NOTE: Modular cylinders use...
These cylinders are designed with a microswitch attached to the back of the cylinder. The switch is operated by a cam when the key is rotated.   To order: XB09-195 Mort...
The XB09-195, XB09-795, and XQ11-804 are basically modified mortise cylinders. The overall length of the mortise cylinder switch is approximately 1-9/16" (1.563"). The diameter of the cylinder face...