ASSA d12

=ASSA d12=

The d12 is a medium security EN 1303-rated pin tumbler cylinder made by ASSA for residential or commercial use. It is intended as a successor to the ASSA 700 series which dates back to 1948. The d12 features six pins and numerous security improvements over the original cylinder, including a paracentric keyway and patented key profiles.

Principles of operation
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Disassembly instructions
There are two main assemblies this lock can be found in which will vary by branding and format. One uses a C-clip on the back on the plug while the other uses a large retaining screw.

If the lock uses the retaining screw:


 * 1) Unscrew the Torx screw on the tailpiece and remove the wafer beneath it.
 * 2) Unscrew the retaining screw from the rear of the plug.
 * 3) Unscrew and remove the closing rod over the pin chambers (be careful not to allow springs to escape).
 * 4) Remove the driver pins and springs. They are all the same so there is no need to keep them in order. Key pins cannot fit through the top chambers.
 * 5) Slide the plug out of the housing.

Disassembly using a follower is possible but not recommended due to the threads on the back of the plug that accept the retaining screw.

If the lock uses a C-clip:


 * 1) Remove the 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)

Vulnerabilities
The ASSA d12 may be vulnerable to one or more of the following:


 * Lockpicking
 * Decoding
 * Impressioning
 * Key bumping