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

BEST 8K Series Grade 1 Heavy Duty Storeroom Function Double Cylinder 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 storeroom 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: Accommodates door thickness from 1 3/8" to 2" standard, with special E trim available for 2 1/8" to 3" doors.
• Enhanced Security Design: 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 latching.
• Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis ensures smooth, wear-resistant operation throughout the lock's service life.
• Quick Rekeying Capability: BEST interchangeable core system allows economical rekeying without lock replacement for efficient key management.
• Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liner for long-term durability.

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: Storeroom
• 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 (1 3/8" to 2" standard), 2 1/8" bore hole, and 1" edge hole for latch housing.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper chassis and strike plate positioning.
3. Prepare door by drilling 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing per manufacturer specifications.
4. Install chassis, latch assembly, and strike plate using appropriate mounting hardware and secure per manufacturer torque specifications.
5. Adjust knob operation and latch alignment for proper function, ensuring 9/16" throw deadlocking latch engages securely with strike plate.
6. Test lock operation to verify proper function of both keyed and non-keyed sides, 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 (Non-ADA Compliant Regions)

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 demanding commercial applications where dependable security is essential. Engineered for high-traffic environments with corrosion-resistant internal components and smooth-operating steel retractor systems for lasting functionality.