The Schlage 47710918 is the OEM indicator mechanism for the Schlage ND Series cylindrical lock indicator function family. It is the mechanical assembly inside the trim that links the interior push-button lock operation to the indicator window display - the component responsible for physically changing the indicator from Vacant to Occupied, or from Unlocked to Locked, when the push button is engaged or released. When this mechanism fails, the indicator either stays in one position regardless of the push-button state, moves sluggishly, or binds - leaving the occupancy or security status display unreliable. The 47710918 is the field replacement for the indicator mechanism without replacing the full trim assembly.

Compatible with nine ND Series indicator functions per the Schlage ND Series Service Manual: ND40, ND44, ND50, ND52, ND53, ND55, ND78, ND91, and ND92. All nine are Trim Assembly placements - the mechanism seats in the trim and is not part of the lock chassis.

Schlage Indicator Lock Functions: IND OS vs IND IS

The nine compatible functions split into two categories based on which side of the door the indicator window faces.

IND OS (Outside Indicator) functions show the indicator status from the corridor or public side of the door. The ND40 IND OS is the bath and bedroom privacy lock with outside indicator - used in hotel rooms, residential suites, and any room where staff or other occupants need to see at a glance whether the room is occupied without knocking. The ND44 IND OS is the hospital privacy lock with outside indicator, which adds an emergency outside turn-button so clinical staff can release the privacy lock without a key. The ND52 IND OS is the keyed privacy lock - a key from outside can release the interior push-button lock in addition to showing the indicator. The ND55 IND OS is the entrance lock with automatic unlocking and outside indicator, which releases the outside lever automatically after a set time following key operation.

IND IS (Inside Indicator) functions show the indicator status from inside the room. The ND50 IND IS is the entrance/office lock with an inside indicator - the person inside can confirm the door is locked without testing the outside lever. The ND53 IND IS is the entrance lock with an inside indicator. The ND78 IND IS is the classroom security lock with 180-degree lockdown capability and inside indicator, used in K-12 and higher education applications where the indicator confirms lockdown status at a glance from inside the classroom. The ND91 IND IS and ND92 IND IS are Vandlgard functions - ligature-resistant lever trim with inside indicator for high-risk healthcare environments.

Schlage Occupancy Indicator: How the 47710918 Mechanism Works

The indicator mechanism is a spring-loaded rotating or sliding drum inside the trim body that moves in response to the push-button plunger position. When the interior push button is engaged (pressed in and latched), the plunger movement drives the indicator mechanism to rotate or shift, bringing the "Occupied" or "Locked" lens window into the visible position on the trim face. When the push button releases - either by turning the inside lever, by key override from outside, or by emergency turn on ND44 - the mechanism spring returns the indicator to the "Vacant" or "Unlocked" position.

The indicator sign (the actual text lens that displays "Occupied/Vacant" or "Unlocked/Locked") is a separate part from the mechanism. The 47858867 sign (Vacant/Occupied) and 47858868 sign (Unlocked/Locked) are the visual elements that mount in the indicator window carrier of this mechanism. Replacing the 47710918 mechanism restores the linkage function; if only the sign text is damaged or incorrect, only the sign needs replacement.

Schlage ND Series Indicator Lock Parts: Ordering Notes

The 47710918 mechanism is the same part across all nine compatible functions. It does not need to be specified differently for IND OS vs IND IS applications - the trim orientation (outside-facing or inside-facing) is determined by the trim assembly itself, not by the mechanism variant. Confirm the installed ND function (ND40, ND44, ND50, ND52, ND53, ND55, ND78, ND91, or ND92) is one of the nine listed before ordering.

For the complete Schlage ND Series indicator function parts catalog including indicator signs, plunger bar assemblies, and emergency cylinders, SecurityParts stocks OEM replacement parts.