BEST 9K Intruder Function Grade 1 Cylindrical Lever Lock with Visual Lockdown Indicator

BEST 9K Intruder Function Grade 1 Cylindrical Lever Lock with Visual Lockdown Indicator

Professional Classroom Security Solution with Emergency Lockdown Capability

The BEST 9K Intruder Function cylindrical lever lock provides critical classroom security with a visual lockdown indicator that shows which way to turn the key for secure emergency locking. This Grade 1 heavy-duty lock features a 2-3/4" backset, solid brass 9/16" latch throw, and cast construction lock hub designed for 1-3/4" to 2-1/4" doors. Tested to exceed 10 times the BHMA Grade 1 criteria by UL, this lock delivers proven reliability for educational facility security applications.

Professional Features & Benefits

• Visual Lockdown Indicator: Easy-to-understand marking on classroom side shows which way to turn the key for emergency locking from inside the classroom.
• Grade 1 Heavy-Duty Performance: Tested to exceed 10 times the BHMA Grade 1 criteria by UL for exceptional durability in high-traffic educational environments.
• Cast Construction Lock Hub: Protects critical lock components from everyday use and abuse with hardened steel through-bolt studs for maximum lever torque resistance.
• Pre-Assembled Chassis Design: Out-of-the-box installation with 2-1/16" diameter chassis to fit standard 2-1/8" door holes conforming to ANSI A115.2.
• Solid Brass Latch: 9/16" throw latch with 2-1/4" x 1-1/8" beveled front provides secure latching performance.
• Attack-Resistant Design: Rose locking pin assembly and slotted key release cam create maximum attack resistance while maintaining key access and lever functionality.
• Interchangeable Core System: Allows for quick re-keying and customized master keying for facility-wide access control management.
• 10 Year Limited Warranty: Comprehensive manufacturer warranty provides long-term protection and confidence in product reliability.

Technical Specifications

• ANSI/BHMA: F11
• Backset (Distance): 2-3/4"
• Commercial/Residential: Commercial
• Department: Door Hardware
• Door Hand Direction: Non-Handed
• Duty Level: Heavy Duty
• Electronic: No
• Function Description: Latch: Turning the key in the inside/outside lever, Rotating the inside or outside lever. Outside lever lock or unlocked by turning the key in the outside lever. Inside lever is locked or unlocked by turning the key in the inside lever
• Grade: Grade 1
• Handle Type: Lever
• Keyed: Yes
• Keyed Function: Double Cylinder
• Lock Function: Intruder
• Lock Type: Cylindrical
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Intruder
• Product Group: Mechanical Locks
• Product Model: S
• Product Subgroup: Bored Locksets
• Product Substrate: Corrosion-Treated Steel
• Product Type: Leversets
• Series: 9K Series
• Standard Latch: 9/16" Throw
• Standard Strike: 2-3/4 x 1-1/8" with curved lip and box
• Subcategory: Cylindrical Locks
• Warranty: 10 Year Limited

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/4" to 2-1/4"), backset distance (2-3/4" standard), and handing as applicable to this product.
2. Use manufacturer-provided templates to mark mounting hole locations accurately including standard ANSI A115.2 preparation plus two additional 5/16" diameter through-bolt holes at 12 o'clock and 6 o'clock positions.
3. Prepare door by drilling required holes including 2-1/8" chassis hole and through-bolt mounting holes as specified in manufacturer instructions.
4. Install the pre-assembled chassis and secure with hardened steel through-bolt studs per manufacturer torque specifications for maximum lever torque resistance.
5. Adjust lever operation and visual lockdown indicator alignment for proper emergency locking function and smooth operation throughout the full range of motion.
6. Test device operation including key function from both sides, lever operation, and visual indicator clarity. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Educational Facility Classroom Security
• School Administrative Offices
• Healthcare Institution Patient Areas
• Commercial Office Buildings
• Government and Municipal Buildings
• Multi-Tenant Residential Properties
• Emergency Lockdown Applications

Why Choose BEST Quality?

BEST 9K Series cylindrical locks deliver professional-grade reliability with cast construction components and corrosion-treated steel rated to exceed 10 times BHMA Grade 1 criteria. The 10 Year Limited warranty provides comprehensive protection for demanding commercial and educational applications. Engineered for critical security applications where dependable emergency lockdown performance and visual operation indicators are essential for protecting occupants and staff.