Ives FB52/FB53 Top Bolt with Auxiliary Fire Latch – 3/4″ Throw Non-HandedProfessional Constant Latching Flush Bolt SolutionThe Ives FB52/FB53 Top Bolt with Auxiliary Fire Latch provides constant latching functionality for metal door applications where the inactive door remains latched until the active door is opened. This non-handed flush bolt features a 3/4″ bolt throw with 7/8″ vertical adjustment and 3/4″ bolt backset, designed specifically for use with metal doors only. The FB52 model eliminates the bottom bolt with auxiliary fire latch, while the FB53 includes a retrofit plate to cover existing bottom bolt preparation.Professional Features & BenefitsPrecise Bolt Specifications: 3/4″ bolt throw with 7/8″ vertical adjustment and 3/4″ bolt backset for reliable latching performance.Constant Latching Operation: Inactive door remains latched until active door is opened, releasing automatic bottom bolt before top bolt can be manually released.Fire-Rated Construction: UL Listed for 3-hour fire door applications meeting ANSI/BHMA A156.3 Type 27 standards.Low Actuation Forces: Engineered for smooth operation with minimal effort required for manual release.Non-Handed Design: Universal installation eliminates field determination requirements and reduces inventory needs.Auxiliary Fire Latch: FB52 eliminates bottom bolt while FB53 includes retrofit plate to cover existing bottom bolt preparation.Standard Rod Configuration: 12″ standard rod length measured from center of flush bolt body to bolt for consistent installation.Metal Door Compatibility: Specifically designed for hollow metal door applications in commercial environments.Technical SpecificationsANSI/BHMA: ANSI A156.3 Type 27Commercial/Residential: CommercialDepartment: Door HardwareDoor Hand Direction: Non-HandedDoor Strike: W: 15/16″, L: 2-1/4″, D: 1/16″Fire Rating: YesProduct Category: Door Trim and AccessoriesProduct Dimension: W: 1″, L: 6-3/4″, D: 2″Product Group: Door Trim and AccessoriesProduct Model: FB52/FB53Product Subgroup: Flush BoltsProduct Type: Flush BoltsSubcategory: Flush Bolts and CoordinatorsUL Listing Type: UL Listed 3 HoursInstallation & OperationReview manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.Professional ApplicationsCommercial Office BuildingsEducational FacilitiesHealthcare InstitutionsRetail EstablishmentsIndustrial and Warehouse FacilitiesMulti-Tenant Residential PropertiesGovernment and Municipal BuildingsWhy Choose Ives Quality?Ives flush bolt products deliver professional-grade reliability with UL Listed 3-hour fire rating and ANSI/BHMA A156.3 Type 27 compliance for demanding commercial applications. The constant latching design with low actuation forces ensures dependable operation while meeting stringent fire door requirements. Engineered for demanding commercial applications where dependable performance and code compliance are essential.