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2. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.

3. Glossary of locksmithing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

   The bible [1] is the part of a pin tumbler lock that contains the pins and pin stack springs as well as the pin stacks themselves. The driver pins of a pin-tumbler lock are located in the bible. Bit The section of a key which enters a lock, which has the key cuts formed in it and which engages the bolt or tumblers of the lock.

4. Rekeying - Wikipedia

   en.wikipedia.org/wiki/Rekeying

   Locks are usually re keyed to build master-key systems, make a set of locks share a common key, or to eliminate compromised keys. [2] [3] [4] Sometimes worn pins are replaced with new pins if the old pins become too short to reach the shear-line. [5] The shear-line is the thin line shared by the lock plug and its cylindrical housing. If a pin ...

5. Tubular pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

   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.

6. Shear lock - Wikipedia

   en.wikipedia.org/?title=Shear_lock&redirect=no

   This page was last edited on 30 October 2014, at 19:07 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

7. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   Locks that have master keys have a second set of the mechanism used to operate them that is identical to all of the others in the set of locks. For example, master keyed pin tumbler locks often have two shear points at each pin position, one for the change key and one for the master key. A far more secure (and more expensive) system has two ...