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narrow stile
adj. pertaining to aluminum doors with stiles generally
between 1-3/4 and 2-3/4 inches wide
national service provider
n. a nationwide maintenance contracting
company who supplies the sub-contracted services of a
local technician to a customer
NCK
sym. symbol for
"no change key," primarily used in hardware
schedules
neck
(of a key)
n. 1. the portion
of a bit key between the shoulder and the bit(s) 2. the
portion of a cylinder key between the shoulder and the
bow
negative
locking
n. locking achieved
solely by spring pressure or gravity which prevents a key
cut too deeply from operating a lock or cylinder
nest
n. a unitized group of safe deposit boxes, see also
'tumbler nest'
neuter bow
n. the bow of a key which is unidentifiable to a particular lock
manufacturer
NFPA 80
n. National Fire
Protection Association standards for doors and windows
NFPA
101
n. National Fire
Protection Association life safety code
NFS
abb. non-fail safe
nib ward
n. a ward formed from a lock case by bending part of the case into the
path of the key
nickel silver
n. a brass alloy containing nickel used in making some
key blanks and tumblers
night
latch
n. a rim mounted
auxiliary latch bolt
NKR
abb. non key
retaining
NLSA
abb. National
Locksmith Suppliers Association
NMK
abb. a notation used to indicate "not master keyed" and is
suffixed in parentheses to a regular keying symbol. It indicates that the
cylinder is not to be operated by the master key(s) specified in the
regular keying symbol; e.g., AB6(NMK).
nominal
keyset
n. a keyset listed
with an "X" prefix in a cross keyed cylinder
designation
non-control chamber
n. a chamber in an IC which does not have
a separate shear line for the control function
non-fail
safe
adj.: a feature of
a security device designed to remain engaged, for
security purposes, during a power loss
non-handed
adj. pertaining to
hardware that is manufactured in a way, which allows
installation on doors of any orientation without
requiring modification or adjustment to accommodate the
door orientation
non key
retaining
adj. of or
pertaining to a lock whose key can be removed in both the locked and unlocked positions
non-keyed
adj. having no
provision for key operation Note: This term also includes
privacy function locksets operated by an emergency key.
non-original
key blank
n. any key blank
other than an original
non-removable
key
adj. a key which
has one or more cuts on it which trap the key in the lock
upon insertion
non-removable
pin
n. pertaining to a
hinge whose pin can not be removed when the door is
closed
non-reversible
n. door
hardware whose hand cannot be changed in the field
non-sized
closer
n. a door closer with
infinitely adjustable closing force between specific sizes
nose
n. the part of a
non-cylinder lock which contains the keyway and rotates
within a horn
nose puller
n. a tool used to
remove the nose of a lever tumbler lock and allow access
to the tumblers
NRK
abb. non-removable
key
NRP
abb. non-removable
pin
NSO
abb. National Safemans Organization
NSP
abb. National Service Provider
NUR
abb. nurse's
key
nurse's
key
n. a selective
master key used in a hospital keying system
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