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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


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


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


n. National Fire Protection Association standards for doors and windows

NFPA 101

n. National Fire Protection Association life safety code


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


abb. non key retaining


abb. National Locksmith Suppliers Association


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


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


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


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


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


abb. non-removable key


abb. non-removable pin


abb. National Safemans Organization


abb. National Service Provider


abb. nurse's key

nurse's key

n. a selective master key used in a hospital keying system

Source: Lock Industry Standards and Training (LIST) Council

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