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2. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   Each tenant is given a key that only unlocks their own door, called the change key, but the second key is the master key, which unlocks all the doors, and is usually kept by the building manager, so they can enter any room in the building. In a master-keyed lock, some or all of the pin chambers in the lock have three pins in them instead of two.

3. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   The other was a point formed at the bottom of the lock so a chain could be attached to the lock body to prevent the lock from getting lost or stolen. Cast heart locks were very popular with railroads for locking switches and cars because of their economical cost and excellent ability to open reliably in dirty, moist, and frozen environments.

4. Mortise lock - Wikipedia

   en.wikipedia.org/wiki/Mortise_lock

   The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...

5. Schlage - Wikipedia

   en.wikipedia.org/wiki/Schlage

   Walter Schlage had already secured several patents dating back to 1909, when he patented a doorknob that would also complete an electrical circuit so that, for instance, the lights would turn on when the door was opened. [4] However, Schlage's key invention was the bored cylindrical lock, which evolved through several iterations, including a ...

6. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   A smart lock is an electromechanical lock that is designed to perform locking and unlocking operations on a door when it receives a prompt via an electronic keypad, biometric sensor, access card, Bluetooth, or Wi-FI from a registered mobile device. These locks are called smart locks because they use advanced technology and Internet ...

7. Bored cylindrical lock - Wikipedia

   en.wikipedia.org/wiki/Bored_cylindrical_lock

   Some commercially-sold doors may come prepared to receive one or more bored cylindrical locks, such as entry doors, which typically require both a door knob and dead bolt. [ 2 ] In the United States, typically, the face bore is sized from 1.5 to 2.125 inches (3.81 to 5.40 cm) in diameter and is centered at 2.375 or 2.75 inches (6.03 or 6.99 cm ...