BEST 9K Series Grade 1 Institutional Cylindrical Lever Lock with Double Cylinder Keying

BEST 9K Series Grade 1 Institutional Cylindrical Lever Lock with Double Cylinder Keying

Premium Commercial-Grade Security Solution

The BEST 9K Series represents the pinnacle of cylindrical lock engineering, combining top-quality materials with exceptional craftsmanship for demanding institutional applications. This Grade 1 double cylinder institutional lock features a 2-3/4" backset, 9/16" latch throw, and heavy-duty construction rated for commercial use. Built with corrosion-treated steel chassis components and brass critical elements, the 9K delivers maximum security with smooth, reliable operation for high-traffic environments.

Professional Features & Benefits

• Grade 1 BHMA Certification: Listed by BHMA for A156.2, Series 4000, Grade 1 providing the highest level of commercial lock performance and durability.
• Heavy-Duty Construction: Critical latch and chassis components are brass or corrosion-treated steel with zinc hubs and hardened steel alloy lever sleeve for maximum attack resistance.
• Institutional Function: Double cylinder keying allows key control from both inside and outside levers for enhanced security in institutional environments.
• Attack-Resistant Design: Rose locking pin assembly prevents twisting, bending, or breaking under attack while slotted key release cam maintains key access even when damaged.
• Through-Bolt Mounting: Strong through-bolt mounting studs increase torque resistance and provide superior attachment strength compared to standard mounting methods.
• Interchangeable Core Ready: Allows for quick re-keying and customized masterkeying systems for facility management flexibility.
• ADA Compliant Operation: Design and operation meets ANSI A117.1 section 404.2.6 requirements for accessibility compliance.
• 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: Institutional
• Lock Type: Cylindrical
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Institutional
• 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"), 2-1/8" diameter bore hole, and backset distance of 2-3/4".
2. Use manufacturer-provided templates to mark mounting hole locations accurately including 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 standard ANSI A115.2 preparation plus through-bolt holes using recommended drill jig for accuracy.
4. Install chassis assembly and secure with through-bolt mounting studs per manufacturer torque specifications for maximum attack resistance.
5. Adjust lever operation and latch alignment for proper function, ensuring smooth operation and proper strike engagement with 9/16" latch throw.
6. Test lock operation with keys from both inside and outside positions to verify proper institutional function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Healthcare Institutions and Hospitals
• Educational Facilities and Schools
• Government and Municipal Buildings
• Correctional and Detention Facilities
• Mental Health and Treatment Centers
• Senior Living and Care Facilities
• High-Security Commercial Buildings

Anti-Microbial Option

Available with UltraShield antimicrobial protected coating (finish 626AM) that inhibits the growth of bacteria and other microbes on hardware surfaces. Recommended for healthcare, elderly care, education, transportation, food service, and hospitality applications where product cleanliness is a high priority.

Why Choose BEST Quality?

BEST 9K Series cylindrical locks deliver professional-grade reliability with corrosion-treated steel construction and brass critical components rated for Grade 1 commercial performance. Protected by multiple patents and backed by a 10 Year Limited Warranty, the 9K Series is engineered for demanding institutional applications where dependable security and smooth operation are essential. The combination of attack-resistant design features and ADA-compliant operation makes this the premium choice for facilities requiring the highest level of lock performance.