(n.) A semi-circular cut in the bolt
throw bit of a key, with the cut axis
running parallel to the key shaft. Found
typically on a key for a high security
lever safe lock.
Source: Lock Industry Standards and Training
(LIST) Council
Half Mortise
(adj.) 1. Pertaining to an installation
prep that typically leaves the bolt face
plate and a perpendicular surface of
the lock visible, with visible surfaces
being flush mounted.
(v.) 2. To make a cavity in a door or
drawer that is open on the edge and on
one side of the door or drawer.
(adj.) 3. Pertaining to a locking device
designed to fit in a half mortise prep.
Source: Lock Industry Standards and Training
(LIST) Council
Half Mortise Hinge
(n.) A hinge which has one leaf mortised
into the door and the second leaf applied
to the surface of the frame.
Source: Lock Industry Standards and Training
(LIST) Council
Half-Surface Hinge
(n.) A hinge which has one leaf mounted
onto a face of the door and the second
leaf mortised into the frame.
Source: Lock Industry Standards and Training
(LIST) Council
Hand Change
(adj.) Pertaining to a combination lock
in which the wheels must be removed in
order to change the combination.
Source: Lock Industry Standards and Training
(LIST) Council
Handed
(adj.) Pertaining to hardware which is
manufactured only for application on
doors with a specific orientation.
Source: Lock Industry Standards and Training
(LIST) Council
Handicapped Code
(n.) Any building code designed to ease
access for handicapped persons.
Source: Lock Industry Standards and Training
(LIST) Council
Handleset
(n.) A complete lock or latch assembly
which incorporates a pitcher handle.
Source: Lock Industry Standards and Training
(LIST) Council
Hang (Rake & Hang)
(v.) To cause a top or master pin to
rest on the plug when picking.
Source: Lock Industry Standards and Training
(LIST) Council
Hard Wire System
(n.) A system which uses metallic conductors
to connect the various sensors to the
central processor.
Source: Lock Industry Standards and Training
(LIST) Council
Hardened Core (Pin)
(adj.) A bottom or top pin which is bimetallic,
the central portion of which being hardened
metal intended to resist drill attack.
Source: Lock Industry Standards and Training
(LIST) Council
Hardplate
(n.) A tempered barrier placed between
the lock and the outside of a safe to
inhibit drilling.
Source: Lock Industry Standards and Training
(LIST) Council
Hardware Key
(n.) A computer hardware component which
protects copyrights by preventing software
from running on any computer where the
key is not installed. The key is typically
accessed via one of the ports.
Source: Lock Industry Standards and Training
(LIST) Council
Hardware Schedule
(n.) A listing of the door hardware used
on a particular job it includes the types
of hardware, manufacturers, locations,
finishes, and sizes. It should include
a keying schedule specifying how each
locking device is to be keyed.
Source: Lock Industry Standards and Training
(LIST) Council
Hasp
(n.) A hinged metal strap designed to
be passed over a staple and secured in
place.
Source: Lock Industry Standards and Training
(LIST) Council
Header
(n.) The horizontal, top, member of a
door jamb.
Source: Lock Industry Standards and Training
(LIST) Council
Heel & Toe Locking
(n.) Describes a padlock which has locking
dogs at both the heel and toe of the
shackle.
Source: Lock Industry Standards and Training
(LIST) Council
Heel (Of A Padlock Shackle)
(n.) The part of a padlock shackle which
is retained in the case when in the unlocked
position.
Source: Lock Industry Standards and Training
(LIST) Council
Height Adjustment Screw
(n.) A screw contained within the hinge
block of a safe that raises or lowers
the door to clear the frame.
Source: Lock Industry Standards and Training
(LIST) Council
Helmet Lock
(n.) Auxiliary lock on motorcycles used
to secure a helmet.
Source: Lock Industry Standards and Training
(LIST) Council
HGM
(abb.) Horizontal Group Master Key
Source: Lock Industry Standards and Training
(LIST) Council
HiCo
(abb.) High Coercivity
Source: Lock Industry Standards and Training
(LIST) Council
High Coercivity
(adj.) A high energy form of magnetic
encoding measuring in the range of 2400
to 4000 Oe which is resistant to accidental
erasure.
Source: Lock Industry Standards and Training
(LIST) Council
High Security Cylinder
(n.) A cylinder which offers a greater
degree of resistance to any two or more
of the following: picking, impressioning,
key duplication, drilling or other forms
of forcible entry.
Source: Lock Industry Standards and Training
(LIST) Council
High Security Key
(n.) A key for a high security cylinder.
Source: Lock Industry Standards and Training
(LIST) Council
Hinge Security Stud
(n.) A protrusion on one leaf of a hinge
which interlocks with the other when
the door is closed.
Source: Lock Industry Standards and Training
(LIST) Council
Hinge Stile
(n.) The vertical edge of a door where
hinges are installed.
Source: Lock Industry Standards and Training
(LIST) Council
Hinged Shackle
(n.) A shackle whose heel is permanently
mounted to the padlock case in a manner
which allows the shackle to pivot to
open.
Source: Lock Industry Standards and Training
(LIST) Council
HKP
(abb.) Housekeeper's Key
Source: Lock Industry Standards and Training
(LIST) Council
Hobbs Shackle
(n.) A hinged shackle with a notch for
the bolt in its movable end.
Source: Lock Industry Standards and Training
(LIST) Council
Hold Open
(n.) 1. A function of self latching hardware
which allows a lock to be set in a non-latching
mode.
(n.) 2. A function of a door closer,
or separate hardware device, which allows
the door to be retained in an open position.
Source: Lock Industry Standards and Training
(LIST) Council
Hold Open Arm
(n.) A door closer arm with the capability
of maintaining the door in the open position.
Source: Lock Industry Standards and Training
(LIST) Council
Hold Open Cylinder
(n.) A cylinder provided with a special
cam which will hold a latch bolt in the
retracted position when so set by the
key.
Source: Lock Industry Standards and Training
(LIST) Council
Holdback
(n.) A function of some self latching
locks which allows selective retention
of the bolt to prevent latching when
the door is closed.
Source: Lock Industry Standards and Training
(LIST) Council
Holding Fixture
(n.) A device which holds cylinder plugs,
cylinders, housings, and/or cores to
facilitate the installation of tumblers,
springs and/or spring covers.
Source: Lock Industry Standards and Training
(LIST) Council
Hole Change (Wheel)
(n.) A perforated tumbler that may have
its combination set by placement of a
fly relative to, or in, one of the perforations.
Source: Lock Industry Standards and Training
(LIST) Council
Hollow Core Door
(n.) A non-metal door with structural
reinforcement creating air pockets between
the two faces.
Source: Lock Industry Standards and Training
(LIST) Council
Hollow Driver
(n.) A top pin hollowed out on one end
to receive the spring, typically used
in cylinders with extremely limited clearance
in the pin chambers.
Source: Lock Industry Standards and Training
(LIST) Council
Hollow Metal Door
(n.) Typically a door made of sheet metal
on all surfaces and lightly reinforced
to make it rigid.
Source: Lock Industry Standards and Training
(LIST) Council
Hook
(n.) A vertical surface at the top of
a cut angle that prevents smooth insertion
or withdrawal of a key.
Source: Lock Industry Standards and Training
(LIST) Council
Hook Bolt
(n.) A lock bolt shaped in the general
outline of a hook. Normally used on sliding
doors or where spreading of the frame
and door is a possible attack.
Source: Lock Industry Standards and Training
(LIST) Council
Hook Pick
(n.) A pick with a tip that curves upward
by 45º or more toward perpendicular
to the blade.
Source: Lock Industry Standards and Training
(LIST) Council
Hook Ward
(n.) A ward that has an offset requiring
an 'L' shaped cut in the key.
Source: Lock Industry Standards and Training
(LIST) Council
Horizontal Exit
(n.) An exit to the outside or an area
of refuge on the same or nearly the same
level.
Source: Lock Industry Standards and Training
(LIST) Council
Horizontal Group Master Key
(n.) The two pin master key for all combinations
listed in all blocks in a line across
the page in the standard progression
format.
Source: Lock Industry Standards and Training
(LIST) Council
Horizontal Locking
(n.) The locking mechanism associated
with vehicle doors with horizontal linkage.
Source: Lock Industry Standards and Training
(LIST) Council
Horn
(n.) In a non cylinder lock, the housing
which surrounds the nose and extends
through the door or drawer.
Source: Lock Industry Standards and Training
(LIST) Council
Horn Plate
(n.) The cover of a lever tumbler lock
case to which the horn is attached.
Source: Lock Industry Standards and Training
(LIST) Council
Hospital Hinge
(n.) A hinge with a large chamfer at
each end of the knuckle.
Source: Lock Industry Standards and Training
(LIST) Council
Hotel Cylinder
(n.) A cylinder which can function to
prevent the operation of all keys except
emergency, display and some shut out
keys. It may also contain an indicator.
Source: Lock Industry Standards and Training
(LIST) Council
Housekeeper's Key
(n.) A selective master key in a hotel
master key system which may operate all
guest and linen rooms and other housekeeping
areas.
Source: Lock Industry Standards and Training
(LIST) Council
Housing
(n.) That part of a locking device which
is designed to hold a core.
Source: Lock Industry Standards and Training
(LIST) Council
HP
(abb.) Hardplate
Source: Lock Industry Standards and Training
(LIST) Council
Hub
(n.) 1. A lock component, which redirects
rotational motion from a spindle or shaft
to linear movement of a latch or bolt.
(key change) 2. The part of a combination
wheel that the change key engages to
permit the combination to be changed.
Source: Lock Industry Standards and Training
(LIST) Council
Hybrid Key
(n.) A key that can operate locks using
two or more different technologies in
one device, e.g. mechanical/electronic,
mechanical/magnetic, etc.
Source: Lock Industry Standards and Training
(LIST) Council
Hybrid Locking System
(n.) A locking system which derives its
security from two or more different technologies
operated by the same key in one device,
e.g. mechanical/electronic, mechanical/magnetic,
etc.
Source: Lock Industry Standards and Training
(LIST) Council
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