The d12 is a medium security pin tumbler made by ASSA for residential or commercial use. It is intended as a successor to the ASSA 700 series which dates back to 1948. It 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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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:
- Unscrew the Torx screw on the tailpiece and remove the wafer beneath it.
- Unscrew the retaining screw from the rear of the plug.
- Unscrew and remove the closing rod over the pin chambers (be careful not to allow springs to escape).
- 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.
- 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:
- Remove the C-clip.
- Insert the key and turn the plug 45-90 degrees.
- Withdraw the plug from the cylinder. (A plug follower is recommended)
The ASSA d12 may be vulnerable to one or more of the following:
- Paper by Han Fey on ASSA d12
- ASSA d12 product page (Swedish)
- Differences between ASSA 700 and ASSA d12
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