Sargent KESO F1-4270 UL437 Listed High-Security Mortise Lock CylinderProfessional UL437 Listed Security Cylinder SolutionThe Sargent KESO F1-4270 Series cylinder delivers UL437 Listed security performance with enhanced pick and drill resistance for high-security mortise lock applications. Features hardened steel pins and advanced tumbler design with ten-minute attack resistance under standardized UL testing protocols. Listed in the Underwriters Laboratories Burglary Protection Equipment directory under locking cylinders (241 012) for verified security credentials and professional-grade protection against picking, drilling, and forced entry attempts.Professional Features & Benefits UL437 Listed Security Performance: Underwriters Laboratories Burglary Protection Equipment List certification under locking cylinders (241 012) for verified ten-minute attack resistance. Enhanced Pick Resistance: Advanced tumbler design resists aligning tumblers and opening the lock by means of picking tools for superior security protection. Drill Resistant Construction: Hardened steel pins and reinforced cylinder body resist drilling the plug or cylinder body to prevent unauthorized access attempts. Forced Entry Protection: Cylinder design resists opening by forcing tools into the key slot and applying rotary force with pliers or wrenches. Ten-Minute Attack Resistance: UL performance testing verifies resistance to picking, drilling, and forced entry attempts for at least ten minutes under standardized protocols. Multiple Finish Options: Available in finishes 03, 04, 09, 10, 10B, 10BE, 10BL, 14, 15, 20D, 32, 32D, BSP, and WSP for architectural coordination requirements. System Compatibility: Can be keyed into total security systems when requirements are established at system design phase for integrated access control. Mortise Lock Integration: Designed specifically for mortise lock applications with professional-grade security performance and reliable operation.Technical Specifications Refer to manufacturer documentation for complete technical specifications.Installation & Operation Review 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 Applications High-Security Commercial Buildings Government and Municipal Facilities Financial Institution Security Healthcare Facility Restricted Areas Educational Institution Administrative Zones Industrial Facility Secure Storage Multi-Tenant Residential Security SystemsWhy Choose Sargent Quality?Sargent KESO F1-4270 Series cylinders deliver professional-grade security with UL437 Listed performance and hardened steel pin construction rated for ten-minute attack resistance. Listed in the Underwriters Laboratories Burglary Protection Equipment directory under locking cylinders for verified security credentials. Engineered for demanding high-security applications where dependable protection against picking, drilling, and forced entry is essential.