The Schlage 48106794 is the OEM indicator chassis with exterior indicator for the Schlage ND Series ND50 (Entrance/Office) and ND53 (Entrance Lock) functions - the OS (Outside/Exterior) indication trim configuration. It ships unfinished: no factory finish is applied, and the installer applies the finish to match the existing hardware. This is the trim assembly chassis that enables an ND50 or ND53 cylindrical lock to display the Locked/Unlocked indicator from the corridor side of the door, not from inside the room.

This is a distinct configuration from the inside indicator (IS-IND) versions of the same functions. Confirm whether the installed specification calls for corridor-side (exterior/OS) or room-side (inside/IS) indicator visibility before ordering.

Exterior vs Inside Indicator on the ND50 and ND53

The Schlage ND Series indication trim is offered in two configurations for the ND50 and ND53 functions. The inside indicator (IS-IND) version places the indicator window on the inside trim - the person inside the room can see whether the lock is in the Locked or Unlocked state. The exterior indicator (OS-IND) version, which this chassis supports, places the indicator window on the outside trim so corridor-facing personnel can see the lock state without testing the lever.

Per the official Schlage ND Series Indication Trim product page, the exterior indicator configuration is offered as "keyed, single cylinder exterior indicator trim only" for the ND50 Entrance/Office, ND52 Keyed Privacy, ND53 Entrance Lock, ND55 Entrance Lock with Automatic Unlocking, and ND73 Corridor Lock functions. The 48106794 chassis specifically serves the ND50 and ND53 in this outside indicator configuration.

The Allegion installation instruction for this configuration (document 016111) is titled "ND50/52/53/55/73-OS-IND" - confirming this is the OS (Outside) indicator assembly.

How the Exterior Indicator Works on the ND50/53

On the ND50 entrance/office function with exterior indicator, the indicator sign is visible from the corridor. When the inside push button is engaged and the outside lever is locked, the indicator on the exterior trim raises to show "Locked" - corridor personnel can immediately see the room is secured without approaching and testing the lever. When the key from outside retracts the latch and releases the inside button, or when the inside lever is turned to release the push button, the indicator lowers to show "Unlocked" and the outside lever is again operable.

On the ND53 entrance lock with exterior indicator, the sequence works similarly: push the inside button to lock the outside lever, indicator raises to "Locked"; rotate the inside lever to release the button, or use the key from outside, and the indicator lowers to "Unlocked."

The exterior indicator application is specified in facilities where staff in the corridor or adjacent spaces need to monitor room occupancy or security status without disturbing the occupant - hospital nursing stations monitoring adjacent patient rooms, school administrative staff monitoring faculty offices, or security personnel monitoring controlled access points.

Schlage Indicator Chassis: Unfinished vs Factory Finished

The "Unfinished" designation on the 48106794 means the chassis body ships without any plated or coated factory finish. This is specified when the project requires a custom or non-standard finish, or when the chassis is being installed in an application where the finish will be field applied to match existing hardware. Factory-finished indicator chassis versions are available in specific finishes ordered through the standard ND Series configuration. If a factory-finished chassis is required, confirm the finish code with the Schlage ND Series specification before ordering the unfinished version.

For the complete Schlage ND Series indicator trim and chassis catalog including inside indicator, outside indicator, and unfinished configurations, SecurityParts stocks OEM components.