Sargent DL Series Grade 1 Passage Tubular Lock with Standard Lever - 2 3/4" Backset Commercial HardwareProfessional Passage Lock Solution for Commercial ApplicationsThe Sargent DL Series tubular lock combines style and function with ease of installation, exceeding the expectations of demanding architects, design professionals, and building contractors. This Grade 1 commercial passage lock features a 2 3/4" standard backset, accommodates door thickness from 1 3/8" to 1 3/4", and includes a 1/2" latchbolt throw for reliable operation. UL-cUL fire-rated up to 3 hours and ADA compliant for accessibility requirements.Professional Features & Benefits Door Compatibility: Standard 2 3/4" backset with adjustable range from 2 3/8" to 2 3/4" accommodates various door preparations. Door Thickness Range: Fits doors from 1 3/8" minimum to 1 3/4" maximum thickness for versatile installation options. Grade 1 Commercial Construction: ANSI/BHMA A156.4 Grade 1 rated for heavy-duty commercial applications and high-traffic environments. Non-Handed Design: Universal installation eliminates field confusion and reduces inventory requirements for contractors. Fire Rating Compliance: UL-cUL fire-rated up to 3 hours for code compliance in fire-rated door assemblies. ADA Accessibility: Americans with Disabilities Act compliant design meets accessibility requirements for commercial buildings. Decorative Hardware Options: Available with Studio Collection, Coastal Series, and standard trim options including roseless configurations. Manufacturer Warranty: 10 Year Limited warranty provides confidence and protection for commercial installations.Technical Specifications Refer to manufacturer documentation for complete technical specifications.Installation & Operation Review manufacturer specifications and verify door preparation requirements including door thickness between 1 3/8" and 1 3/4", and backset requirements from 2 3/8" to 2 3/4". Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for tubular lock installation. Prepare door by drilling required holes per manufacturer specifications, ensuring proper alignment for smooth operation. Install tubular lock mechanism and secure all mounting hardware per manufacturer torque specifications. Adjust latchbolt operation for proper 1/2" throw and verify smooth lever operation throughout full range of motion. Test passage function to verify proper operation 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 Multi-Tenant Residential Properties High-End Apartment and Condominium Projects Government and Municipal Buildings Interior Office and Conference Room ApplicationsWhy Choose Sargent Quality?Sargent DL Series tubular locks deliver professional-grade reliability with Grade 1 commercial construction rated for heavy-duty applications. UL-cUL fire-rated up to 3 hours and backed by 10 Year Limited warranty coverage. Engineered for demanding commercial applications where dependable performance and code compliance are essential.