Glossary
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.
See also: "tumbler nest"
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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Emergency Service 
