-N-

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