Yes, it is possible to have multiple door locks that use the same key. This is a convenient and popular option for many homeowners and businesses. There are a few different ways to achieve this:
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Master Keying
Master keying is when a locksmith configures the locks to work with two different keys – one “master key” that opens all the locks, and individual keys that only open one lock each. This allows you to give each person access only to certain areas while maintaining access to everything with the master key.
To master key locks, a locksmith will re-pin the cylinders inside the locks to specific combinations. The master key has cuts that align with all the cylinders, while the change keys only align with their respective cylinder.
Master key systems can be as simple as one master key for all the locks, or complex systems with multiple levels of access. For example, you may have an exterior master key, an interior master key, and sub-master keys for certain departments or levels.
The main benefits of master key systems are:
- Convenience of only carrying one key for full access
- Only have to rekey one lock if a key is lost or stolen
- Can grant access to certain individuals without giving full access
Master keying does require working with an experienced locksmith to set up properly. And any new locks added will also need rekeyed to the system.
Keyed Alike Locks
Another option is to purchase multiple locks that are all keyed alike from the manufacturer. Many lock brands offer this service where they configure locks to work with the same key prior to shipping.
To get keyed alike locks, you simply provide the key code or submit one of your existing keys. The lock company has machines to cut keys and pin cylinders based on your specifications. Then all the locks will work with that same key.
The main advantage of keyed alike locks is convenience. You don’t need a locksmith to rekey anything – all the locks work with the same key right from the start. You also don’t have the hierarchy of a master key system.
The downside is keyed alike locks are less secure. If one key is lost or stolen, then all the locks need to be rekeyed. And you can’t selectively give people access to certain locks.
Key Control Cabinets
A key control cabinet or key box is a centralized storage device that allows secure access to master keyed systems. Each keyed alike lock gets assigned a specific hook or slot inside the locked cabinet.
Personnel retrieve their assigned key by signing out in a logbook or using an electronic access system. This allows access to be tracked and keys to be secured.
Key control cabinets are great for managing large master keyed systems with many users, such as schools, hospitals, multi-residence buildings, and more. The benefits include:
- Keys are organized in one location
- Locks aren’t compromised if an assigned key is lost
- You can monitor and log who accesses keys
- Keys are safe from theft or duplication
Using a key control cabinet takes more oversight than just freely issued keys. But they are indispensable for maintaining security in any large master key system.
Common Questions
How many locks can be master keyed together?
There is no set limit on how many locks can be included in a master key system. It’s possible to have a few locks around a home up to hundreds of locks across an entire corporate campus or university on the same system.
The more locks included, the more complex the pinning configurations become. So at some point it becomes impractical for a locksmith to manage. But modern master key systems can easily accommodate 20-50 locks as needed for most homes and small businesses.
What’s the difference between master keying and keyed alike locks?
The main difference is master keying creates a hierarchy of keys, while keyed alike locks all work with one single key:
- Master key systems – Have a master key that opens all locks, plus individual keys for each lock that only open one.
- Keyed alike locks – All locks configured to the same key from the start. No hierarchy.
Master keying offers more flexibility for granting access. But keyed alike locks are quicker and don’t require a locksmith.
How secure are master keyed systems?
Master keyed locks maintain a high level of security, arguably more than keyed alike locks. Since each lock has its own key, a lost key only compromises one lock. Master keying also uses more difficult to pick paracentric keyways.
The more locks in the system though, the more possible key combinations. So someone could potentially try to “solve” the system through duplication or decoding. Proper implementation by a locksmith minimizes this risk.
Using a key control cabinet increases security since keys aren’t freely accessed. And using restricted keyways and duplicating “Do Not Duplicate” keys also prevents unauthorized copying.
Do all lock brands offer master keying services?
Most major lock manufacturers like Schlage, Kwikset, and Yale provide master keying services. But some smaller, low-cost brands may not. This is something to specifically look for when choosing locks.
In general, having locks master keyed requires removable cores that a locksmith can easily re-pin. Locks with permanent one-piece cylinders don’t allow master keying.
So check with the manufacturer to confirm their locks support master keying. And also ensure your local locksmith provides master key services for that brand.
Conclusion
Getting multiple door locks keyed to the same key is convenient and secure when done properly. Master keying by a professional locksmith is the best way to add control and hierarchy for managing access.
Keyed alike locks simplify the process by arriving pre-configured, but lack some of the benefits of a true master key system. Key control cabinets also help organize and track keys in large setups.
Taking the time to properly implement the right solution will ensure you can conveniently access all doors and maintain the highest security across your property.
