Schlage Primus

=Schlage Primus=

The Primus (or Classic Primus, Primus XP) is a UL 437 rated pin-tumbler lock made by Schlage. It uses six pin-tumblers and a sidebar that requires finger pins to be raised and rotated properly. The Primus is functionally identical to the ASSA Twin Combi lock, but it does not include as many anti-lockpicking and key control mechanisms.

The Primus is an updated version of the Schlage Everest. The Schlage Everest Primus is an alternate version of the Primus that enhances key control capabilities.

Principles of operation
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Notes
 * The Primus is available in rated and non-rated cylinders. Non-rated cylinders do not include hardened anti-drill protections.

Key security levels
The Primus offers a variety of key security levels:


 * Level 1 - Commercially Exclusive
 * Distributors sell to end users via commercial locksmiths. All Level 1 keys have the same sidebar bitting code.


 * Level 1+ - Wholesaler/Locksmith Exclusive
 * Locksmiths resell exclusive wholesaler sidebar bittings. Keys are stamped with unique locksmith ID numbers.


 * Level 2 - Contract Hardware Dealer Exclusive
 * Exclusivity limited to contract hardware dealers who sell directly to end users.


 * Level 3 - End User Exclusive
 * Exclusivity based on random assignment or the first 2 digits of a zip code.


 * Level 4 - End User Exclusive
 * Exclusivity based on time zone or nation.

Disassembly instructions
The Schlage Primus is disassembled in the same way as a traditional pin-tumbler cylinder. Care is taken to account for the sidebar and finger pins. Finger pins are spring biased outwards when the plug is exposed without a key inserted.

Vulnerabilities

 * Lockpicking
 * Key bumping
 * Impressioning
 * Decoding

Notes
 * Key bumping is possible only with a bump key that has the correct sidebar code.

Gallery
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