Sargent 8259 School Security Double Locking Function Grade 1 Mortise Lock with 2 3/4″ BacksetProfessional Grade 1 Mortise Lock SolutionThe Sargent 8259 mortise lock delivers maximum security, performance, and durability with heavy-duty Grade 1 construction for demanding commercial applications. This professional-grade lever-style mortise lock features a 2 3/4″ backset, 1 3/4″ door thickness compatibility, and 3/4″ latchbolt throw for reliable operation. UL tested to 16 million cycles with Grade 1 operational rating, this lock integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying options.Professional Features & Benefits Heavy-Duty Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional long-term reliability in high-traffic applications. Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and performance standards. Standard Door Compatibility: 2 3/4″ backset depth and 1 3/4″ door thickness accommodate standard commercial door preparations with 3/4″ latchbolt throw. EcoFlex Technology: Electromechanical version operates from 12 to 24VDC with EcoFlex technology reducing power consumption up to 96% for energy-efficient operation. Universal Key System Integration: Compatible with all SARGENT key systems (Degree, Signature, KESO, and XC) for flexible master keying options and system integration. Multi-Functional Design: Available in 56 different functions including electromechanical, security and monitoring configurations with field-reversible handing. Fire-Rated Construction: UL 10C Fire-Rated up to 3 hours with NFPA 80 compliance for life safety applications and code requirements. Comprehensive Warranty: 10-year limited warranty with 2-year coverage on electrical components for added confidence and protection.Technical Specifications Refer to manufacturer documentation for complete technical specifications.Installation & Operation Verify electrical requirements match available power supply. Confirm voltage (12 to 24VDC for electromechanical version) and current capacity before proceeding. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures. Mount the unit in the specified location ensuring adequate clearance for wiring access, ventilation, and future service requirements. Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application. Configure operational settings including field-reversible handing and any configurable options per application requirements. Restore power and test all functions including normal operation, locking mechanisms, and integration with connected systems. Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, and troubleshooting.Professional Applications Educational Facilities and School Security Systems Commercial Office Buildings Healthcare Institutions Government and Municipal Buildings Multi-Tenant Residential Properties Industrial and Warehouse Facilities Retail EstablishmentsWhy Choose Sargent Quality?Sargent 8200 Series mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in independently verified testing. With comprehensive fire ratings up to 3 hours, Grade 1 operational certification, and a 10-year limited warranty with 2-year electrical coverage, these locks are engineered for demanding commercial applications where dependable performance and maximum security are essential.