BEST 8K Series Communicating Function Double Cylinder Grade 1 Heavy Duty Knob Lock

BEST 8K Series Communicating Function Double Cylinder Grade 1 Heavy Duty Knob Lock

Premium Grade 1 Cylindrical Knob Lock for Heavy-Duty Commercial Applications

The BEST 8K Series delivers dependable security for high-traffic commercial environments with Grade 1 heavy-duty construction. This communicating function double cylinder knob lock features knobs machined from solid brass or bronze bar stock with a 2 1/16" diameter chassis designed to fit 2 1/8" door holes. The 9/16" throw deadlocking latch provides reliable security, while the adjustable door thickness accommodation from 1 3/8" to 2" ensures versatile installation compatibility.

Professional Features & Benefits

• Grade 1 Heavy-Duty Construction: Exceeds ANSI Grade 1 requirements for security and reliability in demanding commercial applications.
• Solid Machined Knobs: Knobs machined from solid brass or bronze bar stock provide exceptional durability and premium feel with 2 1/8" diameter and 2 7/8" projection from door.
• Adjustable Door Compatibility: Standard adjustment from 1 3/8" to 2" door thickness with special E trim available for 2 1/8" to 3" doors.
• Enhanced Security Features: Cores must be removed before keyed knobs to deter break-in attempts, with snap-on inside rose featuring no exposed screws for tamper resistance.
• Deadlocking Latch System: 9/16" throw deadlocking latch with 2 1/4" x 1 1/8" beveled front fits 1" hole in door edge for secure engagement.
• Smooth Operation Design: Steel retractor with low friction bearings and long bearing length in chassis ensures smooth, wear-resistant operation throughout the lock’s service life.
• Rotating Knob Face: Allows easy hand of door change without removing the knob, simplifying installation and reconfiguration.
• Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel for long product life in demanding environments.

Technical Specifications

• Commercial/Residential: Commercial
• Department: Door Hardware
• Door Hand Direction: Non-Handed
• Duty Level: Heavy Duty
• Electronic: No
• Grade: Grade 1
• Handle Type: Knob
• Keyed: No
• Keyed Function: Double Cylinder
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Communicating
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Series: 8K Series
• Subcategory: Bored Locksets

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness from 1 3/8" to 2" and 2 1/8" bore hole for lock housing.
2. Use manufacturer-provided templates to mark mounting hole locations accurately including 1" hole for latch tube in door edge.
3. Prepare door and frame by drilling required holes including 2 1/8" diameter bore for chassis and routing as specified in manufacturer instructions.
4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications, ensuring proper rose threading to chassis.
5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion, utilizing the rotating knob face feature for hand changes if needed.
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

• Government and Military Facilities
• Commercial Office Buildings
• Educational Institutions
• Healthcare Facilities
• Industrial and Warehouse Buildings
• Multi-Tenant Residential Properties
• International Projects Without ADA Requirements

Why Choose BEST Quality?

BEST 8K Series knob locks deliver professional-grade reliability with solid brass or bronze construction and Grade 1 certification that exceeds ANSI requirements for security and durability. The premium workmanship and carefully designed components ensure long-term performance in high-traffic commercial applications. Engineered for demanding environments where dependable security and smooth operation are essential for years of reliable service.