NCK
symbol for `no change key,` primarily used in hardware schedules
NMK
a keying symbol which means `not master keyed` and is suffixed in parentheses to the regular key symbol. It indicates that the cylinder is not to be operated by the master key(s) specified in the regular key symbol; e.g., AB6(NMK).
non key retaining
adj. of or pertaining to a lock whose key can be removed in both the locked and unlocked positions
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