Corbin Russwin ML2057-KEYED Grade 1 Mortise Storeroom Lock with Field-Reversible LatchboltCommercial-Grade Mortise Storeroom Security for High-Traffic ApplicationsThe Corbin Russwin ML2057-KEYED is a Grade 1 mortise storeroom lockset from the ML2000 Series, engineered for demanding commercial, institutional, industrial, and government environments. Conforming to ANSI function F07, this lock operates with a latchbolt retracted by grip from inside or by key from outside, while the outside grip remains always rigid and the auxiliary latch automatically deadlocks the latchbolt for enhanced security. Designed for 1-3/4″ (44mm) standard door thickness with a field-reversible handing feature, the ML2057 is constructed of heavy-gauge steel with a patented Quick Reversible latchbolt and a 1″ stainless steel deadbolt, making it an ideal solution for offices, schools, hospitals, hotels, and other high-use facilities.Professional Features & BenefitsANSI/BHMA Grade 1 mortise lock per A156.13 Series 1000, Operational and Security Grade 1UL Cycle above and beyond: 14.5 Million Cycles (Verification ID: V875753)Patented Quick Reversible latchbolt reverse handing without disassembling the lock caseMulti-function capability: 12 functions configurable from one ML2054 lockbodyHeavy-gauge steel lockcase 5-7/8″ x 4″ x 15/16″; 1″ stainless steel deadbolt, 1″ throw3/4″ (19mm) throw anti-friction two-piece latchbolt requires less force to closeWide variety of trim designs including Muso, Vineyard, Behavioral Health (BHSS/BLSS)Status indicator options for locked/unlocked visibility (sectional and escutcheon trim)Motorized Electric Latch Retraction (MELR) available for ML20900 seriesThru-bolted trim designs for proper alignment and increased securityCan be used with new or existing Corbin Russwin key systems; accepts most other manufacturers’ cylindersUL/cUL listed, UL10C positive pressure; 3-hour fire door up to 4′ x 10′ single or 8′ x 10′ pairTen-year mechanical warranty; five-year MELR; two-year electricalTechnical SpecificationsGrade: ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1Handing: Handed; quick reversible re-handed without disassembling the lock caseDoor Thickness: 1-3/4″ (44mm) standard; optional thicknesses availableBackset: 2-3/4″ (70mm)Lockcase: Heavy-gauge steel, 5-7/8″ (149mm) x 4″ (102mm) x 15/16″ (24mm)Armored Front: Wrought brass, bronze, or stainless steel, 8″ x 1-1/4″Latchbolt: 2-piece mechanical with anti-friction insert, 5/8″ x 1″ x 3/4″ (19mm) throwAuxiliary Latchbolt: 9/16″ (14mm) effective throw; deadlockingDeadbolt: One-piece stainless steel, 19/32″ x 1-1/4″ x 1″ (25mm) throwStrike: Wrought brass, bronze, or stainless steel, ANSI straight lip, 4-7/8″ x 1-1/4″ x 1-1/8″ lip to centerCylinder: Brass, 6-pin L4 keyway, 0-bitted standardSpacing: C. to c. knob/lever to cylinder: 3-5/8″ (92mm); knob/lever to thumbturn: 2-7/16″ (62mm)Certifications: ANSI/BHMA A156.13 Grade 1; UL/cUL UL10C 3-hour positive pressure; ADA A117.1; California State Fire Marshal; Windstorm/Hurricane certifiedWarranty: Ten-year mechanical; five-year MELR; two-year electricalProfessional ApplicationsCommercial Office BuildingsEducational Facilities and SchoolsHealthcare Institutions and HospitalsHotel and Hospitality PropertiesIndustrial and Warehouse FacilitiesGovernment and Municipal BuildingsMulti-Tenant Residential and Institutional PropertiesTamper-Resistant DesignThe ML2000VR (Vandal Resistant) Series option features stainless steel escutcheons with tapered edges and Torx pin tamper-resistant screws, providing a vandal-resistant barrier for high-risk or high-traffic environments where security and durability are paramount.Why Choose Corbin Russwin Quality?Corbin Russwin ML2000 Series mortise locks deliver professional-grade reliability with heavy-gauge steel construction and a patented Quick Reversible latchbolt, backed by an extraordinary UL Cycle test result of 14.5 Million Cycles (Verification ID: V875753). The ML2057-KEYED is covered by a 10 Year Limited warranty, underscoring the brand’s commitment to long-term performance. Engineered for demanding commercial applications where dependable storeroom security is essential, the ML2000 Series is the trusted choice for offices, schools, hospitals, and government facilities worldwide.