Quick Answer

The Schlage N123 is an NDE series wireless cylindrical lock. Before ordering any Schlage N123 parts, confirm three things:

• Confirm the model is N123, not N523. Both are NDE wireless locks, but they use different part numbers. The N123 and N523 keycam and plunger assemblies are not interchangeable. The model number is printed on the back of the inside trim or in the project hardware schedule.
• Keycam assemblies: 12 N123 keycam assemblies are stocked, each corresponding to a specific lock function. The part number encodes the function. Replacing a keycam with the wrong function code changes how the lock operates.
• Plunger assemblies: Five plunger types are stocked: push button, push-turn button, spanner button, emergency turn button, and emergency button. The correct type matches the inside trim of the installed lock.
• 21 Schlage N123 parts are stocked at Security Parts across keycam assemblies, plunger assemblies, the RX switch upgrade kit, HSLR screwpack, and mounting screw.

Call 845-935-0301 for pre-order compatibility support before placing your order.

What the Schlage N123 Is

The Schlage N123 is part of the NDE series, Schlage's wireless cylindrical lock platform designed for access control integration in commercial and institutional buildings. NDE locks communicate wirelessly with the access control system through a credential reader built into the outside trim, eliminating the need for data wiring at each door.

The N123 is configured for applications where the door or lock geometry differs from the standard N523 configuration. While both models are NDE wireless cylindrical locks, they use different internal components. The keycam assemblies, plunger assemblies, and other trim parts are specific to each model and cannot be substituted between them.

The N123 is commonly found in healthcare facilities, educational buildings, and government offices where wireless access control was installed during construction or renovation. Replacement parts are ordered when a keycam wears or fails (most often seen as difficulty retracting the latch with a key), when a plunger assembly needs replacement due to physical wear or button malfunction, or when the access control integrator adds an RX switch function to the existing installation.

The N123 is also an appropriate replacement lock when a facility is upgrading from an older Schlage ND Series cylindrical lock (non-wireless) to the NDE wireless platform on doors where the physical prep does not accommodate the standard N523. Because the NDE platform integrates directly with credential management systems, the parts that control the mechanical function of the lock, particularly the keycam and plunger, are specified at the time of installation to match the access control behavior required at each opening. Replacing any of these components requires confirming both the mechanical part number and the intended lock function before ordering.

For the companion guide covering the N523 model, see the Schlage NDE wireless lock parts guide. That guide covers N523-specific keycam assemblies, cylinder options, and tailpiece configurations, which are not applicable to the N123.

How to Confirm You Have an N123, Not an N523

Ordering parts for the wrong NDE model is the most common ordering error on N123 service calls. Before placing any order, confirm the model number using one of these methods:

• Label on the inside trim: Remove the inside trim rose cover. The model number is typically printed or stamped on the back of the inside escutcheon or the lock chassis.
• Hardware schedule: The original project hardware schedule submitted during construction specifies the exact model number for each opening. This is the most reliable source for facilities teams managing a building with a consistent hardware specification.
• Work order documentation: If the installation was performed under a service contract, the original work order typically records the lock model and function code for each door.

If the model number is not accessible from any of these sources, call 845-935-0301. The Security Parts team can help identify the correct model based on part numbers already installed or hardware schedule details.

Schlage N123 Keycam Assemblies

Schlage N123-076 Keycam Assembly. View product page and order.

The keycam assembly is the internal mechanical component that translates key cylinder rotation into latch retraction. The keycam part number specifies both the physical geometry and the lock function (storeroom, classroom, office, etc.). Using a keycam with the wrong function code causes the lock to operate incorrectly, so the replacement must match the installed function exactly.

Twelve N123 keycam assemblies are stocked at Security Parts, covering the complete range of standard functions available for the N123 wireless lock.

Keycam replacement is the most common mechanical service call on the N123. The symptom is typically that the key will not retract the latch, or that it retracts with significantly more force than normal. This indicates that the keycam follower or the cam itself has worn past the service threshold. In high-turnover institutional environments, keycam wear is accelerated by the volume of key turns and the frequency of forced or rushed key operation by staff and students. A worn keycam that is not replaced promptly increases wear on adjacent components, including the cylinder and the latch chassis.

When replacing a keycam assembly, confirm the function code of the installed keycam before ordering. The function code determines how the lock responds to a key turn: whether the latch retracts freely, requires a credential to unlock first, or remains locked regardless of credentials. An incorrect keycam function changes the security behavior of the door.

Schlage N123 Plunger Assemblies

Schlage N123-087 Spanner Button Plunger Assembly. View product page and order.

The plunger assembly controls the inside button or thumbturn mechanism of the N123. Five plunger assembly types are stocked, each corresponding to a different inside trim configuration. The correct replacement must match the existing inside button type exactly, because the plunger geometry is specific to each button style.

Identifying Your Plunger Type

Look at the inside trim of the installed N123. The shape and operation of the inside button identifies the correct plunger assembly:

• Push button (momentary press): A simple button that retracts the latch when pressed and releases when lifted. Use the N123-086 push button plunger bar assembly.
• Push-turn button (press and rotate): A button that requires pressing in and turning to hold the latch retracted. Use the N123-085 push-turn button plunger assembly.
• Spanner button (accessible thumb-turn style): A wider, grip-friendly button that allows operation without fine motor grip. Commonly specified under ADA accessibility requirements. Use the N123-087 spanner button plunger assembly.
• Emergency turn button and plunger: An emergency egress button allowing the door to be unlocked from the inside. Use the N123-084 ND Series emergency turn button and plunger.
• Emergency button plunger: A variant of the emergency function in a push-style plunger configuration. Use the N123-034 emergency button plunger.

For access control applications in healthcare, educational, and government facilities where the N123 is commonly installed, see the access control and commercial door hardware integration guide.

Schlage N123-062 RX Switch Upgrade Kit

Schlage N123-062 RX Switch Upgrade Kit. View product page and order.

The N123-062 RX switch upgrade kit adds a request-to-exit (RX) switch to the inside trim of the N123 wireless lock. When the inside lever handle is depressed, the RX switch sends a signal to the access control system indicating that a person is exiting through the door.

The RX switch upgrade is used when:

• The original N123 installation did not include RX switch wiring and the access control system now requires exit signal monitoring
• The security integrator is adding exit logging to previously unmonitored doors
• The facility is upgrading its access control platform to one that uses RX switch input for door control or reporting
• Code compliance or security policy requires that all controlled openings generate an exit event in the access control log

The N123-062 is an upgrade kit, not a standard replacement part. It adds capability that was not present in the original installation. If the lock already has an RX switch installed and it has failed, contact 845-935-0301 to confirm the correct replacement component before ordering.

Schlage N123 Hardware and Installation Components

Schlage N123-120 HSLR Screwpack. View product page and order.

• N123-120 HSLR screwpack: The hardware kit containing the mounting screws for the HSLR (high security long reach) installation configuration. Replace when original screws are stripped, damaged, or missing from the installation. The HSLR configuration is used when the mounting throughbolts must reach through a thicker door or reinforcing plate.
• N123-020 mounting screw: Individual mounting screw for the N123 lock body. Replace when a single screw is stripped or damaged and the full screwpack is not needed. Order the N123-120 screwpack when multiple screws require replacement.

Both the N123-120 screwpack and the N123-020 mounting screw are commonly needed after a lock has been removed and reinstalled multiple times during access control system upgrades or lock swaps. Thread stripping in the door chassis is one of the more common causes of loose lock installation on doors that have seen repeated hardware changes. Keeping a supply of N123-120 screwpacks on hand reduces service time when screws strip during a scheduled replacement program.

For guidance on maintenance schedules that include hardware inspection for wireless locks, see the commercial door hardware replacement and repair guide. For information on ANSI/BHMA performance standards that apply to the N123 as a Grade 1 cylindrical lock, see the ANSI/BHMA door hardware standards guide.

Complete Schlage N123 Parts Reference

Where to Source Schlage N123 Parts

Security Parts stocks all 21 Schlage N123 parts across keycam assemblies, plunger assemblies, the RX switch upgrade kit, HSLR screwpack, and mounting screw. Same-day shipping on stocked components. Call 845-935-0301 for pre-order compatibility support if you need help confirming the correct keycam function code or plunger type before ordering.

For the companion guide covering N523 parts, see the Schlage NDE wireless lock parts guide. For guidance on commercial door hardware maintenance schedules that cover wireless lock inspection intervals, see the commercial door hardware maintenance checklist. For OEM versus aftermarket guidance on Schlage wireless lock parts, see the OEM vs aftermarket commercial door hardware guide. For Schlage deadbolt parts commonly installed alongside the N123, see the Schlage B663 classroom deadbolt guide.

The N123 is widely specified in healthcare facilities, universities and colleges, and government buildings, where wireless access control is integrated with credential management systems on NDE-compatible platforms.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facilities managers, general contractors, and access control integrators since 2001. Security Parts stocks the complete Schlage N123 parts catalog across all keycam assemblies, plunger assemblies, the RX switch upgrade kit, HSLR screwpack, and mounting screw, with same-day shipping on stocked components and pre-order compatibility support at 845-935-0301.