Schlage Primus

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Schlage Primus

Schlage Primus
Schlage Primus cylinder.jpg
Name Schlage Primus
Manufacturer Schlage
Lock Type Cylinder
Lock Design Pin-tumbler, Sidebar
Patent US 4,756,177
US 4,815,307
Related Locks
Schlage Everest
Schlage Primus Everest


The Primus (or Classic Primus, Primus XP) is a 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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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.[1]
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.

  1. Remove the cam or C-clip.
  2. Insert the key and turn the plug 45-90 degrees.
  3. Withdraw the plug from the cylinder. (A plug follower is recommended)

OR

  1. Remove the chamber casings and take out each pin-stack individually
  2. Remove the cam or C-clip.
  3. Withdraw the plug from the cylinder.


Vulnerabilities

Notes

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

Gallery

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References

See also