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

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

Premium Commercial-Grade Security Solution

The BEST 9K Series cylindrical lever lock delivers professional-grade security with Grade 1 BHMA certification and heavy-duty construction. This communicating function lock features double cylinder keying for maximum access control, 2-3/4" backset, and 9/16" latch throw for reliable performance. Built with corrosion-treated steel chassis and brass components, this lock is engineered for demanding commercial applications requiring superior durability and attack resistance.

Professional Features & Benefits

• Grade 1 BHMA Certification: A156.2 Series 4000 Grade 1 listing ensures maximum durability and security for heavy-duty commercial applications.
• Attack-Resistant Design: Rose locking pin and assembly design offers exceptional torque resistance, preventing twisting, bending, or breaking under attack.
• Innovative Key Access Protection: Slotted key release cam and locking lug assembly provide maximum attack resistance while maintaining key access even when damaged.
• Heavy-Duty Construction: Corrosion-treated steel chassis with brass latch components and zinc hubs with shrouded locking lug for superior quality and torque resistance.
• Smooth Operation: Hub-mounted torsion spring and strong retractor springs prevent lever sag and provide smooth, snappy operation throughout the lock’s service life.
• Reinforced Mounting: Strong through-bolt mounting studs increase torque resistance with heavy rose liner material for enhanced attack resistance.
• Interchangeable Core Ready: Allows for quick re-keying and customized master keying systems for flexible access control management.
• 10 Year Limited Warranty: Comprehensive manufacturer warranty provides added confidence and long-term protection for your investment.

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: Communicating
• Lock Type: Cylindrical
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Communicating
• 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" standard), backset (2-3/4" standard), and handing as applicable to this product.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces, including two additional 5/16" diameter holes for through-bolts at 12 o’clock and 6 o’clock positions.
3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions, ensuring 2-1/8" hole for chassis installation.
4. Install all mounting hardware including through-bolt mounting studs and secure the device to door and frame per manufacturer torque specifications.
5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion, ensuring 9/16" latch throw engagement.
6. 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

• Commercial Office Buildings
• Educational Facilities
• Healthcare Institutions
• Retail Establishments
• Industrial and Warehouse Facilities
• Multi-Tenant Residential Properties
• Government and Municipal Buildings

Anti-Microbial Option

BEST UltraShield™ antimicrobial protected coating is available (finish 626AM) to inhibit the growth of bacteria and other microbes on hardware surfaces. This option is 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 components rated for Grade 1 heavy-duty performance. The 10 Year Limited warranty and BHMA A156.2 Series 4000 certification provide added confidence for demanding commercial applications. Engineered with innovative attack-resistant features and interchangeable core capability, the 9K Series ensures dependable security where professional performance is essential.