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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) from the leading edge of the door. This distance is referred to as the "backset." [3] Other, less popular, backsets are at 3.75 and 5 inches (9.5 and 12.7 cm). Residential doors ...
For example, a standard 6 pin cylinder, which was designed to be operated by only one key, can be operated by up to 2 6 = 64 keys if there are two shear points in each chamber. Larger organizations, with more complex systems, may have several levels of master keys, where the top level key works in all of the locks in the system.
Interchangeable cores require a notch at the tip of each key to properly align the peaks and valleys of each blade with the combinating pins in the chambers of the mechanism; as a consequence, these keys are always configured and cut from blade tip to bow. Conversely, conventional cylinders and removable cores use a shoulder near the bow of ...
KEY: key: Drawing callouts marked "KEY" define "key characteristics" that are considered especially important for fit, function, safety, or other reasons. They are thus subjected to higher inspection sampling levels. KPSI, kpsi: kilopounds per square inch, that is, thousands of pounds per square inch: See discussion at synonym KSI. KSI, ksi
A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
The term "warded lock" refers to the lock mechanism, while the term "mortise lock" refers to the bolt location. Warded locks contain a series of static obstructions, or wards, within the lock box; only a key with cutouts to match the obstructions will be able to turn freely in the lock and open the latch. [4]
Key control (advantages): Due to the magnetic cylinder elements embedded in the keys, there is a high degree of key control. Unlawful key duplications are minimized by limited access to key blanks (locksmiths) and unique magnetic coding in the key that cannot easily be determined by inspecting the target lock.
To ensure that the ticket was not issued incorrectly, a book of numbered tickets was kept in a locked box, the key to which was permanently fastened to the token, or was the token. In addition, the lock prevented the token from being removed until the ticket box was closed, and it could not be closed unless the book of tickets was in the box.