Sargent 8289 Heavy Duty Single Cylinder Mortise Lock with EcoFlex Technology and Holdback FunctionIndustry Benchmark Grade 1 Mortise Lock with Advanced Energy ManagementThe Sargent 8289 represents the industry benchmark for mortise locks, delivering maximum security, performance, and durability through high-quality components and patented design. This heavy duty single cylinder mortise lock features holdback lock function with Grade 1 operational rating and operates from 12 to 24VDC with revolutionary EcoFlex technology that reduces power consumption up to 96%. Tested to 16 million cycles and certified to multiple industry standards including UL 10C fire rating up to 3 hours with 3/4" latchbolt throw for maximum security.Professional Features & Benefits Ultra-High Cycle Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional longevity in high-traffic commercial applications. EcoFlex Energy Technology: Revolutionary power management creates up to 89% energy savings on electromechanical functions while maintaining reliable 12 to 24VDC operation. Grade 1 Security Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification with 3/4" latchbolt throw and curved lip strike for maximum security. Universal Key System Integration: Compatible with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying options. Field-Reversible Installation: Multifunctional lockbody allows on-site function changes and field reversible handing for reduced inventory requirements and installation flexibility. Fire-Rated Construction: UL 10C positive pressure fire-rated up to 3 hours with NFPA 80 compliance for life safety applications. Comprehensive Certifications: ADA compliant, ASTM E330 certified, Florida Building Code approved, and Environmental Product Declaration (EPD) available. Extended Warranty Protection: 10-year limited warranty on mechanical components with 2-year coverage on electrical components for long-term reliability assurance.Technical Specifications Refer to manufacturer documentation for complete technical specifications.Installation & Operation Verify electrical requirements match available power supply. Confirm 12 to 24VDC voltage 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 function changes per application requirements. Restore power and test all functions including normal operation, holdback function, 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 Commercial Office Buildings Healthcare Institutions Educational Facilities Government and Municipal Buildings Industrial Facility Access Control Multi-Tenant Residential Properties Emergency Exit Compliance ApplicationsWhy Choose Sargent Quality?Sargent mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles through independent UL testing. The 10-year limited warranty on mechanical components and 2-year electrical warranty provide comprehensive protection for demanding commercial applications. Engineered with EcoFlex technology and Grade 1 certification, this industry benchmark lock ensures dependable performance where maximum security and energy efficiency are essential.