The Schlage 24759664 is the OEM electrified lock case for the LM Series, specifically built for use with the LM9291, LM9293, and LM9295 motor-driven lever control functions. It's the lock body that houses the motor mechanism, latch assembly, and switch circuitry for three of the highest-security functions in the Schlage L Series mortise lock family. When the existing lock case fails on an LM9291/93/95 installation, or when a new installation requires the lock body sourced separately from trim, this is the correct OEM replacement.

This lock case is not compatible with standard L9000 Series mechanical functions or other LM Series functions outside of LM9291, LM9293, and LM9295. Match the function number on the installed lock before ordering.

What the Schlage LM9291, LM9293, and LM9295 Functions Do

The "LM" prefix in the Schlage function family means motor-driven lever control. These are L Series mortise locks where an internal motor in the lock case electrically controls lever operation rather than using a solenoid. The motor delivers ultra-quiet activation and a low holding current that eliminates heat buildup in electrically locked applications, which is the chronic failure mode of solenoid-based designs on doors that stay locked continuously.

The LM9291, LM9293, and LM9295 functions are the double-lever lockdown variants. Per Schlage's electrified lock installation instructions (Allegion document 110539), LM9291/93/95 functions lock both the inside and outside levers simultaneously. This is the critical distinguishing specification. Standard electrified L Series functions like the L9082EL and L9092EL control only the outside lever, leaving the inside lever always free for egress. The LM9291/93/95 functions can electrically lock both sides, a capability that places strict code requirements on the application. These functions must not be installed on egress doors without compliant panic hardware. They're specified for pharmaceutical storage rooms, psychiatric and behavioral health secure units, high-value asset rooms, and any application where complete bi-directional lever lockdown is a code-permitted security requirement.

Schlage L Series Parts: Lock Case Specifications

The 24759664 electrified lock case uses the standard L/LV/LM 9000 Series chassis dimensions. Case size is 4-7/16" x 6-1/16" x 1" (113 mm x 154 mm x 25 mm). Backset is 2-3/4" (70 mm). Door range is 1-3/8" to 2-1/2" (35 mm to 64 mm). Lock front is 1-1/4" x 8" x 7/32". Center of deadbolt is 3-1/32" (77 mm) above the latch centerline.

The lock case runs on 12VDC or 24VDC and auto-detects the input voltage with no configuration required when switching between supply voltages. The EL (Electrically Locked, Fail Safe) or EU (Electrically Unlocked, Fail Secure) setting is field selectable via a case-mounted switch, meaning the operating mode can be changed in the field without opening the lock case or reordering. Power supply must be a UL 294/UL 603 listed, Class 2 power-limited source.

Schlage L Series Levers and Trim Compatibility for LM9291/93/95

The 24759664 lock case uses specific trim templates for each function variant. Per the Schlage L Series Door Template Index: LM9291 uses rose trim templates L938 and L954, or escutcheon templates L937 and L953. LM9293 uses L940/L956 for rose and L939/L955 for escutcheon. LM9295 uses L942/L958 and L941/L957 respectively.

The LM Series lock case includes a spring-loaded fusible link that provides fail secure mode in a fire event, a security blocking hub that prevents lock access by removing the levers, and provisions for RX (request to exit), LX (latchbolt monitor), and DPS (door position switch) monitoring. The LM9200 is a related but separate function for two-point locking applications and uses a different lock case.

SecurityParts stocks OEM Schlage L Series and LM Series electrified lock cases, trim assemblies, and parts.