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Deadbolt
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== Common types == A deadlock, if it is cylinder operated, may be either single cylinder or double cylinder. A '''single cylinder''' deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side. '''Double cylinder''' locks will accept a key on both sides and therefore do not require (and often do not have) any twist knob. This prevents unwanted unlocking of the door by forced access to the interior twist knob (via a nearby window, for example). Double cylinder locks are sometimes banned from areas because they can be difficult to open from the inside and violate [[fire safety]] regulations. Some lock manufacturers also have a "lockable" knob: a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), ''unless'' a button has been pressed, in which case a key is also needed on the internal side.<ref name=Abloy>{{cite web | title = Lockable Thumbturn H2X Deadbolts | url = http://www.abloy.ca/index.php?module=AxialBoutique&func=view_one_product&id=418&nav=1_99 | author = Abloy | access-date = 2011-10-22 | archive-date = 2012-04-25 | archive-url = https://web.archive.org/web/20120425083337/http://www.abloy.ca/index.php?module=AxialBoutique&func=view_one_product&id=418&nav=1_99 | url-status = dead }}</ref> A variant of the standard deadbolt is the '''vertical deadbolt''', invented by [[Segal Lock and Hardware Company|Samuel Segal]]. Vertical deadbolts resist ''jimmying'', in which an intruder inserts a [[crowbar (tool)|crowbar]] between the door and the [[jamb]] and attempts to prise the bolt out of the door. Other types of deadbolts include: * Classroom-function (thumb-turn only unlocks door) * Exit-only function (no external cylinder) * Push-button deadbolt (mechanical or electrical) * Single cylinder with removable thumb-turn
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