Sargent 8243-ET Heavy Duty Mortise Lock with Deadbolt – Grade 1 Apartment Corridor FunctionIndustry Benchmark Mortise Lock with Maximum Security and PerformanceThe Sargent 8243-ET represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This Grade 1 apartment corridor function lock features a heavy-duty single cylinder with deadbolt design, 2 3/4″ backset depth, and 1 3/4″ door thickness compatibility. The multi-functional lock body accommodates a variety of lever and escutcheon styles while maintaining robust construction that exceeds independently verified testing standards.Professional Features & Benefits Heavy-Duty Durability: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for exceptional longevity in high-traffic commercial applications. Grade 1 Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification ensures maximum security and reliability for demanding commercial environments. Door Compatibility: Designed for 1 3/4″ door thickness with 2 3/4″ backset depth for standard commercial door installations. Fire-Rated Construction: UL 10C Fire-Rated up to 3 hours with positive pressure certification for life safety applications. Universal Key System Integration: Integrates with all SARGENT key systems including Degree, Signature, KESO, and XC for flexible master keying options. Field Reversible Handing: Accommodates both left and right-hand door installations without additional parts or modifications. Comprehensive Certifications: ADA compliant, NFPA 80 compliant, and certified to multiple ASTM standards including E330, E1996, E1886, and TAS 201/202/203. Manufacturer Warranty: 10-year limited warranty on mechanical components with 2-year coverage on electrical components for added confidence and protection.Technical Specifications Refer to manufacturer documentation for complete technical specifications.Installation & Operation Review manufacturer specifications and verify door preparation requirements including 1 3/4″ door thickness, 2 3/4″ backset depth, and handing as applicable to this mortise lock. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper mortise preparation. Prepare door and frame by drilling required holes and routing mortise cavity as specified in manufacturer instructions. Install all mounting hardware including strike plate and secure the lock body to door per manufacturer torque specifications. Adjust operational components including latchbolt throw for proper alignment, latching, and smooth operation throughout the full range of motion. Test device operation to verify proper function of both latch and deadbolt mechanisms and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.Professional Applications Commercial Office Buildings Educational Facilities Healthcare Institutions Retail Establishments Industrial and Warehouse Facilities Multi-Tenant Residential Properties Government and Municipal BuildingsWhy Choose Sargent Quality?Sargent mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in UL testing. The 10-year limited warranty on mechanical components with 2-year electrical coverage demonstrates confidence in long-term performance. Engineered for demanding commercial applications where dependable security and maximum durability are essential.