ABH A450HD Heavy-Duty Aluminum Continuous Gear Hinge Half Surface with 450 lb CapacityProfessional Half Surface Continuous Hinge SolutionThe ABH A450HD Heavy-Duty Aluminum Continuous Gear Hinge delivers professional-grade performance for commercial door applications requiring superior weight capacity and alignment control. This half surface design accommodates doors up to 48″ width with a maximum weight capacity of 450 lbs, featuring a 9/32″ door inset configuration. BHMA Grade 1 certified construction ensures reliable operation in demanding commercial environments, while fire ratings support both metal doors (90 minutes) and wood doors (60 minutes).Professional Features & BenefitsHeavy-Duty Weight Capacity: Supports doors up to 450 lbs with 48″ maximum door width for versatile commercial applications.Precision Door Inset: 9/32″ door inset provides optimal clearance and professional appearance in half surface installations.BHMA Grade 1 Certification: Meets BHMA 156.25 Grade 1 standards for superior durability and performance in commercial applications.Fire-Rated Construction: Approved for metal swinging fire doors up to 90 minutes and wood swinging fire doors up to 60 minutes.Continuous Weight Distribution: Full-length design eliminates door binding and sagging by evenly distributing weight throughout the entire door and frame.Enhanced Security Design: Eliminates gaps between door and frame to prevent prying attempts and unauthorized access.Surface Application: No mortising required for door or frame installation, simplifying installation and covering old butt hinge cut-outs.Professional Fastening System: Includes 12-24 X 3/4″ undercut self drilling, thread-forming tek machine screws for frame and 1/4-20 sex bolts and shoulder bolts for door.Technical SpecificationsBAA Qualified: YesCommercial/Residential: CommercialDepartment: Door HardwareDoor Weight: 450Fasteners: 12-24 X 3/4″ undercut self drilling, thread forming tek machine screwsHinge Type: Half SurfaceKeyed: N/AKeyed Function: N/APDF:A450HD Aluminum Continuous Gear Hinges Half Surface: https://.com/content/pdf/abh/0000140_a450_aluminum_geared_hinge_02.pdfPDF:Aluminum Continuous Geared Hinge Door Clearance Chart: https://.com/content/pdf/abh/0000383_aluminum_cont_geared_hinge_door_clearance_chart_squared_edged_pg6_rev.pdfPDF: A450HD & A460 Aluminum Continuous Gear Hinges Half Surface – Cut Sheet: https://.com/content/pdf/abh/0000199_a450_a460.pdfPDF: Aluminum Continuous Geared Hinge Cross Reference Chart: https://.com/content/pdf/abh/0000406_cross_reference.pdfPDF: BHMA GRADE 1: https://.com/content/pdf/abh/0002339_bhma_grade_1_for_hinges_compressed.pdfProduct Category: Door Hinges and PivotsProduct Group: Door Hinges and PivotsProduct Model: A450HDProduct Subgroup: Continuous HingesProduct Type: Continuous HingesSeries: A450HD SeriesSubcategory: Half Surface ModelProfessional ApplicationsCommercial Office BuildingsEducational FacilitiesHealthcare InstitutionsRetail EstablishmentsIndustrial and Warehouse FacilitiesMulti-Tenant Residential PropertiesGovernment and Municipal BuildingsWhy Choose ABH Quality?ABH A450HD continuous gear hinges deliver professional-grade reliability with heavy-duty aluminum construction rated for 450 lb door capacity and BHMA Grade 1 certification. The anodized-after-machining process and templated hole patterns ensure consistent performance over time in demanding commercial applications. Engineered for superior weight distribution and security enhancement where dependable door operation is essential.