The Professional Locksmith Dictionary – N 2018-09-18T18:21:20+00:00

Project Description

©ABCDEFGHIJKLMNOPQRSTUVWXYZ – Appendix

-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

©ABCDEFGHIJKLMNOPQRSTUVWXYZ – Appendix