Schlage Residential FC21 Alexandria Knob Passage/Privacy Cylindrical Lock - Grade 2 Non-KeyedDual-Function Residential Lock with Easy InstallationThe Schlage Residential FC21 Alexandria Knob combines passage and privacy functions in a single Grade 2 cylindrical lock designed for 1-3/8" to 1-3/4" doors. This non-keyed lock operates as passage by default and converts to privacy with an interior pushbutton, featuring dual backset compatibility for 2-3/8" or 2-3/4" installations. ANSI/BHMA A156.2-2017 Grade 2 certified with stainless steel construction for reliable residential performance.Professional Features & BenefitsDoor Thickness Compatibility: Fits 1-3/8" to 1-3/4" doors with dual backset options for 2-3/8" or 2-3/4" installations.Dual Function Operation: Default passage function with privacy conversion via interior pushbutton, plus emergency unlock capability from exterior.Grade 2 Certification: ANSI/BHMA A156.2-2017 Grade 2 and A156.39-2015 Residential Grade AAA certified for reliable performance.Professional Latch System: 1" x 2-1/4" latch with 1/4" radius corner faceplate, 1/2" throw, and universal drive-in design.Stainless Steel Construction: Durable stainless steel substrate provides long-lasting performance and corrosion resistance.Easy Installation: 3-step installation process requires only a screwdriver with included universal latch and full lip radius strike.Fire Door Compatible: Available UL Listed for 90-minute fire door applications when required.Manufacturer Warranty: 10 Year warranty coverage for added confidence and protection.Standard FeaturesCertification:ANSI/BHMA A156.2-2017 Grade 2ANSI/BHMA A156.39-2015 Residential Grade AAAAvailable UL Listed for 90 minute fire doorLatch: 1"x 2-1/4", 1/4" radius corner faceplate, 1" housing diameter, 1/2" throw, circular drive-in included, universal latchStrike: 1-5/8" x 2-1/4" radius corner, full lipBackset: Dual backset latches, fits either 2-3/8" or 2-3/4" backsetsCylinder: 5-Pin, C keyway, keyed alike (KA4)Door Range: 1-3/8" 1-3/4"Keys: Two per lock, 5-pin, C sectionInstallation & OperationReview manufacturer specifications and verify door preparation requirements including door thickness between 1-3/8" and 1-3/4" and backset measurement of either 2-3/8" or 2-3/4".Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for the cylindrical lock installation.Prepare door by drilling required holes per manufacturer specifications for the 1" housing diameter and latch installation.Install the universal latch system and full lip radius strike using provided mounting hardware per manufacturer torque specifications.Mount the lock assembly and adjust for proper alignment, ensuring smooth knob operation and proper latch engagement.Test both passage and privacy functions including pushbutton operation and emergency unlock capability. Refer to manufacturer documentation for complete installation details and troubleshooting.Professional ApplicationsResidential Interior DoorsBedroom and Bathroom PrivacyHall and Closet AccessMulti-Family Housing UnitsApartment and Condominium BuildingsSingle-Family Home ConstructionResidential Renovation ProjectsWhy Choose Schlage Residential Quality?Schlage Residential FC21 locks deliver professional-grade reliability with stainless steel construction and Grade 2 ANSI/BHMA certification for demanding residential applications. The 10 Year warranty coverage and dual-function design provide versatile performance for passage and privacy needs. Engineered with easy 3-step installation and universal compatibility for reliable long-term service.