Locksmith Glossary - N


Source: Lock Industry Standards and Training (LIST) Council

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).
(n.) 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.

Neuter Bow
(n.) The bow of a key which is unidentifiable to a particular lock manufacturer.

NFPA 101
(n.) National Fire Protection Association life safety code.

NFPA 80
(n.) National Fire Protection Association standards for doors and windows.

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 Key Retaining
(adj.) Of or pertaining to a lock whose key can be removed in both the locked and unlocked positions.

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-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.

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