Bypass keying, a masterkeying specialty, is a form of controlled cross keying, primarily used where there is an office suite with an external door and a number of offices within that suite. The front exterior door is operated by any of the interior door keys. This allows users to carry a minimum...
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- Set only half the bittings on the bypass if size is allowable. The first two small column-blocks for bypass 1, the last two column-blocks held in reserve for rekeying bypass 2. The only advantage to this is in keeping the existing sub-master key. All the other rooms still need to be rekeyed to bittings on bypass 2.
- The only other viable option is to rekey the exterior door onto one of the available bittings meant for an office door. Then remove the bypass system and give everybody another key to carry.
- If that is not a good option, redo the entire bypass system using a new sub-master key.
Despite these caveats, bypass keying is more controlled than other forms of cross keying. For one, you will know it works only under a specific submaster system, and will not interchange with other sub-masters. You can set the limits as required. Although using just a single block master here was used as an example, this method can be expanded to larger sub-masters. It can even be a sort of masterkeying for a common area in the building rather than just for a suite of offices. Perhaps everyone should have access to a pantry or kitchen area, but the kitchen or pantry may need to be locked to keep unwanted guests out of the food. This application would be ideal for bypass keying, as everybody needs to get in, but it also must stay locked.
Articles about masterkeying have appeared dozens of times in Locksmith Ledger. Masterkeying has been the topic of books by well-known people in our industry. Full one or two day classes on...
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There is no substitution for experience. When beginning locksmiths encounter problems, it behooves them to disassemble lock cylinders and take a close look at what is going on.