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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