BEST 8K Series Classroom Function Single Cylinder Grade 1 Heavy Duty Knob Lock

BEST 8K Series Classroom Function Single 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 knobs machined from solid brass or bronze bar stock and a 2 1/16" diameter chassis designed to fit 2 1/8" door holes. This Grade 1 heavy-duty cylindrical knob lock features a 9/16" throw deadlocking latch with 2 3/4" standard backset and accommodates door thickness from 1 3/8" to 2" standard. The classroom function (R) provides single cylinder operation with SFIC core compatibility for quick, economical rekeying.

Professional Features & Benefits

• Grade 1 Heavy-Duty Construction: Exceeds ANSI Grade 1 requirements with knobs machined from solid brass or bronze bar stock for exceptional durability in commercial applications.
• Precision Door Compatibility: 2 1/16" diameter chassis fits 2 1/8" door holes with adjustable door thickness from 1 3/8" to 2" standard, plus special E trim available for 2 1/8" to 3" doors.
• Enhanced Security Design: Keyed knob removable only after core removal to deter break-in attempts, with snap-on inside rose featuring no exposed screws for additional tamper resistance.
• SFIC Core System: 7-pin housing accepts all BEST cores (less SFIC core) enabling quick, economical rekeying with BEST interchangeable core technology.
• Smooth Operation Components: Steel retractor with low friction bearings and long bearing length in chassis provide smooth, wear-resistant operation throughout the lock’s service life.
• Versatile Rose Options: Multiple rose configurations including round 3 3/4" diameter (A), round 2 9/16" diameter (C), and convex round 3 3/8" diameter (D) for various aesthetic and functional requirements.
• Professional Strike Options: Standard STK strike (2 3/4" x 1 1/8") for 1 3/8" doors and S3 strike (4 7/8" x 1 1/4") for 1 3/4" doors, both conforming to ANSI standards.
• Corrosion-Resistant Materials: Internal components are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liner for long-term reliability.

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: Yes
• Keyed Function: Single 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: Classroom
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Series: 8K Series
• Standard Cylinder: 7-pin housing, accepts all BEST cores (less SFIC core)
• Subcategory: Bored Locksets

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including 2 1/8" bore hole, 1" edge hole for latch, and door thickness compatibility (1 3/8" to 2" standard).
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces, ensuring proper backset alignment (2 3/4" standard).
3. Prepare door by drilling required 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing.
4. Install latch assembly with 9/16" throw deadlocking mechanism and secure chassis to door per manufacturer torque specifications.
5. Mount appropriate rose configuration (A, C, or D style) and install knobs, ensuring rotating knob face is properly aligned for hand of door requirements.
6. Test lock operation including key function, latch engagement, and knob rotation to verify proper installation and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Educational Facilities and Classroom Security
• Government and Military Buildings
• Commercial Office Buildings
• Healthcare Institutions
• Industrial and Warehouse Facilities
• Multi-Tenant Residential Properties
• International Projects Requiring Heavy-Duty Hardware

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 precision-machined components and corrosion-resistant internal parts ensure dependable performance in demanding commercial applications where long-term security and smooth operation are essential.