-N-

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 standard for fire doors and other opening protectives

 

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

This listing of the Locksmith Dictionary is courtesy of