door handle with key and indicator

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Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
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 ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
Hotel lock with 09-611 "Do not disturb" indicator - Latchbolt is operated by key outside or by knob/lever inside. Outside knob/lever is always fixed. Deadbolt is thrown or retracted by inside thumb...
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 ...
Von Duprin offers two options:The CDSI/HDSI Dogging Indicator provides an at-a-glance verification of the status of the door from inside of the room. Visible “LOCKED” and “UNLOCKED” indicators show...