Editing Bank vault (section)

===Lock===
A vault door, much like the smaller burglary safe door, is secured with numerous massive metal bolts (cylinders) extending from the door into the surrounding frame.  Holding those bolts in place is some sort of lock.  The lock is invariably mounted on the inside (behind) of the difficult-to-penetrate door and is usually very modest in size and strength, but very difficult to gain access to from the outside.  There are many types of lock mechanisms in use:
*A [[combination lock]] similar in principle to that of a padlock or safe door is very common.  This is usually a mechanical device but products incorporating both mechanical and electronic mechanisms are available, making certain safe cracking techniques very difficult.<ref>{{cite web|title=Kaba-MAS X-09 and CDX-09 High Security Locks|url=http://www.kaba-mas.com/pdf/brochures/x_09.pdf|pages=8|date=Dec 2010|access-date=28 December 2010|archive-date=14 March 2005|archive-url=https://web.archive.org/web/20050314012811/http://www.kaba-mas.com/pdf/brochures/x_09.pdf|url-status=live}}</ref>
*Some high-end vaults employ a two piece key to be used in conjunction with a combination lock. This key consists of a long stem as well as a short stamp which should be safeguarded separately and joined to open the vault door.<ref>{{Cite book|last=Scott Selby & Greg Campbell|url=https://www.scottselby.com/flawless|title=Flawless: Inside the Largest Diamond Heist in History|publisher=Sterling|year=2010|pages=148–149|access-date=24 August 2021|archive-date=15 August 2021|archive-url=https://web.archive.org/web/20210815161257/https://www.scottselby.com/flawless|url-status=live}}</ref>
*A dual control (dual custody) combination lock has two dials controlling two locking mechanisms for the door.  They are usually configured so that both locks must be dialed open at the same time for the door to be unlocked.  No single person is given both combinations, requiring two people to cooperate to open the door. Some doors may be configured so that either dial will unlock the door, trading off increased convenience for lessened security.
*A [[time lock]] is a clock that prevents the vault's door from opening until a specified number of hours have passed. This is still the "theft proof" lock system that Sargent invented in the late nineteenth century. Such locks are manufactured by only a few companies worldwide. The locking system is supplied to the vault manufacturer preassembled.
* Many [[safe-cracking]] techniques also apply to the locking mechanism of the vault door.  They may be complicated by the sheer thickness and strength of the door and panel.