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

BEST 8K Series Entrance 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, adjustable door thickness from 1 3/8" to 2", and accepts all BEST interchangeable cores with 7-pin housing. Exceeds ANSI Grade 1 requirements for security and reliability in demanding commercial applications.

Professional Features & Benefits

• Heavy-Duty Construction: Knobs machined from solid brass or bronze bar stock with 2 1/8" diameter and 2 7/8" projection for exceptional durability and professional appearance.
• Grade 1 Performance: Exceeds ANSI Grade 1 requirements for security and reliability with 9/16" throw deadlocking latch and steel retractor with low friction bearings.
• Flexible Door Compatibility: Adjustable for 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.
• BEST Interchangeable Core System: 7-pin housing accepts all BEST cores for quick, economical rekeying and master key system integration.
• Professional Installation Features: 2 1/16" diameter chassis fits standard 2 1/8" door hole with multiple backset options including 2 3/4" standard, 3 3/4", and 5".
• Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liner for long-term reliability.
• Optional Security Features: Available with breakaway feature to prevent overpowering by wrench, knurled knob option for accessibility applications, and security head machine screws.

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
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Entrance
• 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 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 in door edge for latch housing.
3. Prepare door by drilling required 2 1/8" diameter hole for chassis and 1" hole for latch tube per manufacturer specifications.
4. Install chassis and latch assembly, selecting appropriate backset (2 3/4" standard, 3 3/4", or 5") and strike configuration for door thickness.
5. Thread roses to chassis and adjust for proper door thickness, ensuring friction insert inside rose prevents loosening.
6. Test knob operation, latch function, and key operation to verify proper installation and smooth operation throughout full range of motion. 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 Manufacturing Plants
• Multi-Tenant Residential Properties
• High-Traffic Commercial Entrances

Why Choose BEST Quality?

BEST 8K Series knob locks deliver professional-grade reliability with solid brass or bronze construction machined from bar stock and Grade 1 performance that exceeds ANSI requirements. Internal components feature corrosion-resistant treatment and steel retractor with low friction bearings for smooth, wear-resistant operation over the long term. Engineered for demanding commercial applications where dependable security and durability are essential.