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Glossary of Terms

National Service Provider

(n.) A nationwide maintenance contracting company who supplies the sub-contracted services of a local technician to a customer.
Source: Lock Industry Standards and Training (LIST) Council

NCK

(sym.) Symbol for "no change key," primarily used in hardware schedules.
Source: Lock Industry Standards and Training (LIST) Council

Neck (of a Key)

(n.) 1. The portion of a bit key between the shoulder and the bit(s).
(n.) 2. The portion of a cylinder key between the shoulder and the bow.
Source: Lock Industry Standards and Training (LIST) Council

Negative Locking

(n.) Locking achieved solely by spring pressure or gravity which prevents a key cut too deeply from operating a lock or cylinder.
Source: Lock Industry Standards and Training (LIST) Council

Nest

(n.) A unitized group of safe deposit boxes.
Source: Lock Industry Standards and Training (LIST) Council

Neuter Bow

(n.) The bow of a key which is unidentifiable to a particular lock manufacturer.
Source: Lock Industry Standards and Training (LIST) Council

NFPA 101

(n.) National Fire Protection Association life safety code.
Source: Lock Industry Standards and Training (LIST) Council

NFPA 80

(n.) National Fire Protection Association standards for doors and windows.
Source: Lock Industry Standards and Training (LIST) Council

NFS

(abb.) Non-Fail Safe
Source: Lock Industry Standards and Training (LIST) Council

Nib Ward

(n.) A ward formed from a lock case by bending part of the case into the path of the key.
Source: Lock Industry Standards and Training (LIST) Council

Nickel Silver

(n.) A brass alloy containing nickel used in making some key blanks and tumblers.
Source: Lock Industry Standards and Training (LIST) Council

Night Latch

(n.) A rim mounted auxiliary latch bolt.
Source: Lock Industry Standards and Training (LIST) Council

NKR

(abb.) Non Key Retaining
Source: Lock Industry Standards and Training (LIST) Council

NLSA

(abb.) National Locksmith Suppliers Association
Source: Lock Industry Standards and Training (LIST) Council

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).
Source: Lock Industry Standards and Training (LIST) Council

Nominal Keyset

(n.) A keyset listed with an "X" prefix in a cross keyed cylinder designation.
Source: Lock Industry Standards and Training (LIST) Council

Non Key Retaining

(adj.) Of or pertaining to a lock whose key can be removed in both the locked and unlocked positions.
Source: Lock Industry Standards and Training (LIST) Council

Non-Control Chamber

(n.) A chamber in an IC which does not have a separate shear line for the control function.
Source: Lock Industry Standards and Training (LIST) Council

Non-Fail Safe

(adj.) A feature of a security device designed to remain engaged, for security purposes, during a power loss.
Source: Lock Industry Standards and Training (LIST) Council

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.
Source: Lock Industry Standards and Training (LIST) Council

Non-Keyed

(adj.) Having no provision for key operation Note: This term also includes privacy function locksets operated by an emergency key.
Source: Lock Industry Standards and Training (LIST) Council

Non-Original Key Blank

(n.) Any key blank other than an original.
Source: Lock Industry Standards and Training (LIST) Council

Non-Removable Key

(adj.) A key which has one or more cuts on it which trap the key in the lock upon insertion.
Source: Lock Industry Standards and Training (LIST) Council

Non-Removable Pin

(n.) Pertaining to a hinge whose pin can not be removed when the door is closed.
Source: Lock Industry Standards and Training (LIST) Council

Non-Reversible

(n.) Door hardware whose hand cannot be changed in the field.
Source: Lock Industry Standards and Training (LIST) Council

Non-Sized Closer

(n.) A door closer with infinitely adjustable closing force between specific sizes.
Source: Lock Industry Standards and Training (LIST) Council

Nose

(n.) The part of a non-cylinder lock which contains the keyway and rotates within a horn.
Source: Lock Industry Standards and Training (LIST) Council

Nose Puller

(n.) A tool used to remove the nose of a lever tumbler lock and allow access to the tumblers.
Source: Lock Industry Standards and Training (LIST) Council

NRK

(abb.) Non-Removable Key
Source: Lock Industry Standards and Training (LIST) Council

NRP

(abb.) Non-Removable Pin
Source: Lock Industry Standards and Training (LIST) Council

NSO

(abb.) National Safemans Organization
Source: Lock Industry Standards and Training (LIST) Council

NSP

(abb.) National Service Provider
Source: Lock Industry Standards and Training (LIST) Council

NUR

(abb.) Nurse's Key
Source: Lock Industry Standards and Training (LIST) Council

Nurse's Key

(n.) A selective master key used in a hospital keying system.
Source: Lock Industry Standards and Training (LIST) Council