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The SCHLAGE COMMERCIAL K510330625 is a replacement emergency button designed for use with L9040 and L9440 series mortise locks. This small-profile component provides the physical actuation point for emergency egress or override functions built into these lock bodies. It is a hardware-level part, not an electronic component, and is finished in Bright Chrome to match standard commercial trim aesthetics. Licensed locksmiths, commercial door hardware installers, and facilities maintenance technicians typically source this part when the original button is worn, damaged, or missing. Its compact footprint — 0.75 inches long by 0.75 inches wide by 0.25 inches tall — makes it a direct form-factor replacement in the existing lock assembly.
This emergency button is intended for commercial and institutional door hardware applications where L9040 or L9440 mortise locksets are installed. These lock series are common in office buildings, healthcare facilities, schools, and other settings that require compliant emergency egress or privacy override capability. The Bright Chrome finish is suited to installations where polished chrome trim is the specified hardware finish standard. This part ships as a single unit and is intended for service and repair use rather than new-construction volume installation.
Designed for use with SCHLAGE COMMERCIAL L9040 and L9440 series mortise locksets in Bright Chrome finish configurations.
Installation should be performed by a licensed locksmith or qualified commercial door hardware technician. Before servicing the lock body, confirm the door is in a safe and accessible state and coordinate with facility management to avoid locking out occupants during the repair. Consult the L9040 or L9440 lock body service documentation to confirm correct button orientation and seating before reassembly. Work performed on egress hardware in commercial buildings may be subject to local building codes and fire egress requirements.
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