BEST 8K Series Double Cylinder Grade 1 Heavy Duty Knob Lock with SFIC Core

BEST 8K Series Double Cylinder Grade 1 Heavy Duty Knob Lock with SFIC Core

Premium Heavy-Duty Cylindrical Knob Lock for High-Traffic Commercial Applications

The BEST 8K Series delivers dependable security in high-traffic commercial environments with Grade 1 heavy-duty construction. This double cylinder knob lock features knobs machined from solid brass or bronze bar stock with a 2 1/8" diameter and 2 7/8" projection from door. Designed with a 2 1/16" diameter chassis to fit 2 1/8" door holes and adjustable for door thickness from 1 3/8" to 2" standard, with special E trim available for 2 1/8" to 3" doors. The 9/16" throw deadlocking latch provides reliable security performance.

Professional Features & Benefits

• Grade 1 Heavy-Duty Construction: Exceeds ANSI Grade 1 requirements for security and reliability with knobs machined from solid brass or bronze bar stock for exceptional durability.
• 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 for versatile installation options.
• 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.
• SFIC Interchangeable Core System: Quick, economical rekeying with BEST interchangeable core technology for efficient key management and security updates.
• Precision Engineering: 2 1/16" diameter chassis fits 2 1/8" door holes with steel retractor featuring low friction bearings for smooth, wear-resistant operation.
• Rotating Knob Face: Provides easy hand of door change without removing the knob, with no keeper hole on keyed knobs for added security.
• Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with friction insert inside rose to resist loosening for long-term reliability.
• Optional Breakaway Feature: Prevents the lockset from being overpowered by a wrench for enhanced vandal resistance in vulnerable applications.

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
• PDF:8K Series Catalog: https://zensupply.com/content/pdf/best/8K-Series-Catalog.pdf
• PDF:Service Manual for 8K Series: https://zensupply.com/content/pdf/best/4418820857627
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Special
• 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" standard, with 2 1/8" bore hole and 1" edge hole requirements.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper chassis and latch alignment.
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 hardware securing all components to door and frame per manufacturer torque specifications.
5. Adjust knob operation and latch alignment for proper 9/16" throw engagement and smooth operation throughout the full range of motion.
6. Test device operation to verify proper function, core installation, 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 heavy-duty performance that exceeds ANSI requirements. The precision-machined components and corrosion-resistant internal parts ensure dependable operation in demanding commercial applications. Engineered for strength, security, and long-term performance where reliable access control is essential.