OCCUPANCY INDICATOR ON CYLINDRICAL LEVER

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The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
The replacement for the D871 is the D271.  None of the parts are backwards compatible. D271 description:Thumbturn x Occupancy Indicator Deadbolt thrown or retracted by turn unit only.  Occupancy...
Indicator not extended Indicator extended
The indicator on a cylindrical hotel lock is a small pin that projects outward from the face of the cylinder plug (Figure 1) when the inside push button is depressed.  When this pin is pr...
The Falcon MA mortise lock is available with an occupancy indicator on the following functions: MA301, MA311, MA321, MA371, MA431, MA441(inside of door only), MA451, MA541, MA57...
Related solution: Is the MA indicator available separately? 
Hotel/motel lock - Deadbolt thrown or retracted by emergency master key in upper cylinder from outside or thumbturn inside. Deadlatch retracted by key in outside knob, except when the lock is in ...
Faculty Restroom Lock - With indicator cylinder. Outside lever fixed. Entrance by key only. Push-button in inside lever activates visual occupancy indicator, allowing only emergency masterkey to o...
ND85PD (ANSI F93) Faculty Restroom Lock  Outside lever fixed. Entrance by key only. Push-button in inside lever activates visual “occupancy” indicator, allowing only emergency master key to opera...
Door bolt occupancy indicator - Deadbolt thrown or retracted by thumbturn inside. Outside indicator displays “In use” or “Vacant”.
Both the Schlage B571 and Falcon D271 are occupancy indicator deadbolts that read "IN USE" and "VACANT".  The B571 is shown below but the indicator will be identical to the D271 (see Figu...
Deadbolt thrown or retracted by turn unit only. Occupancy indicator on outside (reads either in use or vacant with color coding). Bolt automatically deadlocks when fully thrown. Emergency key suppl...
Faculty Restroom Lock - Outside Lever is fixed. Entrance by key only. - Inside Push-button activates occupancy indicator, allowing only emergency master key to operate. Turning lever or closing doo...
Faculty Restroom Lock - With indicator cylinder. Outside knob fixed. Entrance by key only. Push-button in inside knob activates visual occupancy indicator, allowing only emergency master key to op...
Faculty Restroom Lock - With indicator cylinder. Outside knob fixed. Entrance by key only. Push-button in inside knob activates visual occupancy indicator, allowing only emergency masterkey to oper...
The 09-611 indicator stands off the door 0.39".
The pricebook suggests (for a 1-3/4" door) using a 1-3/8" cylinder when installing with an 09-611 occupancy indicator.
The use of Panic Hardware and/or Fire Exit Hardware is required by the International Building Code (IBC) and NFPA 101 – The Life Safety Code, depending on which code and which edition of the code i...
Clear Opening Width for swinging doors is measured (with the door open 90 degree) from the face of door to stop soffit on strike jamb.          &nbs...