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- O.b.
- abb. operated by, as used in keying schedules
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- occupancy type
- adj. the use to which an area of a building is put with reference to the prevailing life safety or building code
- odometer method
- Oe
- abb. oersted
- oersted
- n. a unit of magnetic field strength which is commonly used in the magnetic recording industry
- offset cam
- n. a cam which is bent to have its ends in different planes
- oil cup
- n. a receptacle for lubricant on a machine
- one bitted
- adj. of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number one bitting
- one column progression
- n. a process wherein key bittings are obtained by using the cut possibilities in one column of the key bitting array
- one pin master key
- n. a master key for all combinations obtained by progressing only one bitting position
- one shot
- adj. of or pertaining to a wire run that has an unobstructed line of sight
- one-way deadbolt
- n. a deadbolt operable from only one side of a door
- open back strike
- n. a strike, typically used on double door applications, that has an unenclosed opening opposite the lip edge
- open face dial
- n. a combination lock actuator designed to have all the numbers visible at once
- open gated
- adj. pertaining to a lever tumbler whose gate is in the edge of the tumbler
- open loop
- n. a detection circuit where continuity between branches will result in a reportable condition
- opening index
- n. the index or mark to which a combination is dialed in order to effect an opening
- operating key
- n. any key which will properly operate a lock or cylinder to lock or unlock the lock mechanism and is not a control key or reset key, see also "change key"
- operating shear line
- n. any shear line which allows normal operation of a cylinder or lock
- original key blank
- n. a key blank supplied by the lock manufacturer to fit that manufacturer's specific product
- out of time
- adj. of or pertaining to a condition where a mechanical part is misoriented and cannot function correctly
- overhead concealed closer
- n. a closer designed for installation out of view in the door header area
- overhead stop
- n. a door stop which contacts the door near the top
- override code
- n. in an electronic lock, a factory-set or user-set combination that will always open the lock
- override combination
- n. in certain locks with a user changeable combination, a second combination which allows access at all times. It is usually factory set and may not be field changeable.
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