abb. electronic access control
abb. Electronic Control Module
n. a hole drilled into the edge of a door where a bored or interconnected lockset is to be installed
edge pull
n. a handle mounted on, or in, the edge of a sliding or pocket door for gripping to pull the door closed
educational occupancy
n. those buildings or areas which are designated as places for education purposes according to life safety or building codes
effective plug diameter
n. the dimension obtained by adding the root depth of a key cut to the length of its corresponding bottom pin which establishes a perfect shear line. This will not necessarily be the same as the actual plug diameter.
effective throw
n. the distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch
abb. Electronics Industry Association
ejector hole
n. a hole found on the bottom of certain interchangeable cores under each pin chamber. It provides a path for the ejector pin.
ejector pin
n. a tool used to drive all the elements of a pin chamber out of certain interchangeable cores
E label
n. burglar resistive chest with door thickness at least 1 1/2" steel and wall thickness at least 1" steel
elbow catch
n. an "L" shaped latching mechanism typically mounted to the inside of the inactive leaf of a pair of cabinet doors
electric strike
n. an electro-mechanical strike, which secures or releases the latch via applied current
electrified lockset
n. a lock which is controlled electrically
electronic access control
n. access control that uses electricity
electronic control module
n. an automobile computer that controls all electronic functions of the vehicle
electronic key
n. any key that has an electronic component
emergency code
n. in an electronic lock, a factory-set or user-set code or combination that will open the lock a predetermined number of times
emergency escape mechanism
n. an exit device for a vault
emergency key
n. the key which operates a privacy function lockset
Emergency Master Key
n. a special master key which usually operates all guestroom locks in a hotel master key system at all times, even in the shut out mode. This key may also act as a shut out key.
abb. emergency master key
end cap
n. the cover typically used on the hinge side edge of many touch bar exit devices
end ward
n. a ward which prevents complete insertion and/or rotation of an incorrect key by forming an obstruction to the end of the key
end ward cut
n. any cut made into a key to bypass an end ward
abb. engineer's key
engineer's key
n. a selective master key which is used by maintenance personnel to operate many locks under different master keys in a system of three or more levels of keying
entrapment key
n. a key designed to be captured by a cylinder after insertion
entry/exit delay
n. an alarm or access control feature which allows a specific time lapse between the activation of a switch and the activation of a secondary component
abb. external relocking device 
ER label
n. burglar resistive safe or chest bearing the following label. "Underwriters' Laboratories, Inc. Inspected tool resisting Safe TL-15 Burglary"
one of the components of a timelock which comprises the escape wheel, escapement lever, corresponding pivot (hole) jewels, bridge(s) and platform (base)
n. a surface mounted trim which enhances the appearance and/or security of a lock installation
n. a top and bottom locking system with hooks at either end which rotate to draw a door or window fully closed
exit alarm
n. an annunciator that signals the opening of an exit door
exit device
n. a door lock/latch mechanism which releases in the direction of exit travel via a bar or panel extending across the major width of the door
exit door
n. 1. a door which has no provision for ingress, 2. a door which fills some or all the code requirement for safe egress of the occupant load from a building or portion of a building
exit only
adj. refers to hardware designed to secure an opening in such a way as to permit exit at all times but prevent entry at all times
exit travel, direction of
n. the way occupants are expected to move to get out of a building or a portion of a building
exit width
n. 1. a specification for the minimum door opening, (side to side), that requires application of an exit device, 2. an expression of an actual opening dimension
expansion specification
n. a requirement for bittings to be planned beyond the immediate needs of a keying system
exploratory cut
n. a cut made during impressioning to stop a tumbler from marking
extended lip strike
n. a strike with a (usually curved) leading edge that protrudes to or beyond the edge of the jamb
extension flush bolt
n. a flush bolt that has a separate escutcheon and faceplate
extension link
n. a device which is used to extend the backset of a spring latch or dead latch
External Relocking Device
n. a device outside the lock case that prevents the safe door from being opened after attack, two types are typically used, active and passive 
extractor key
n. a tool which normally removes a portion of a two-piece key or blocking device from a keyway


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Appendix

This listing of the Locksmith Dictionary is courtesy of