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

BEST 8K Series Institutional 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 institutional and commercial environments. This Grade 1 heavy-duty cylindrical knob lock features knobs machined from solid brass or bronze bar stock with a 9/16" throw deadlocking latch. Designed with a 2 1/16" diameter chassis to fit standard 2 1/8" door holes, the 8K Series accommodates door thicknesses from 1 3/8" to 2" with adjustable backset options of 2 3/4", 3 3/4", and 5". The institutional function (W) provides double cylinder operation for enhanced security control.

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 high-traffic applications.
• Institutional Security Design: Double cylinder function with keyed knob removable only after core removal, plus snap-on inside rose with no exposed screws to deter attack attempts.
• Precision Door Compatibility: 2 1/16" diameter chassis fits standard 2 1/8" door holes with adjustable door thickness accommodation from 1 3/8" to 2" standard.
• Flexible Installation Options: Multiple backset configurations (2 3/4", 3 3/4", and 5") with rotating knob face for easy hand-of-door changes without knob removal.
• Enhanced Latch Performance: 9/16" throw deadlocking latch with steel retractor and low-friction bearings for smooth, wear-resistant operation throughout the lock’s service life.
• Interchangeable Core System: Quick, economical rekeying with BEST interchangeable cores for efficient key management in institutional environments.
• Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liners for long-term reliability.
• Optional Security Features: Available with breakaway feature to prevent overpowering by wrench, knurled knob options 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: 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: Asylum/Institution/Utility
• 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 surfaces, selecting appropriate backset (2 3/4", 3 3/4", or 5").
3. Prepare door by drilling required 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing as specified in manufacturer instructions.
4. Install latch assembly and secure the knob lock chassis to door per manufacturer torque specifications, ensuring proper alignment with strike preparation.
5. Adjust knob operation and latch alignment for proper function, utilizing rotating knob face feature for hand-of-door changes if needed.
6. Test lock operation with interchangeable core installed 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
• Institutional Buildings and Dormitories
• Healthcare Facility Utility Areas
• Educational Institution Service Areas
• Commercial Building Mechanical Rooms
• Multi-Tenant Residential Properties
• Industrial Facility Access Points

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 certification that exceeds ANSI requirements. The heavy-duty design features corrosion-treated internal components and steel-reinforced roses engineered for demanding institutional applications where dependable security and long-term performance are essential. Quick interchangeable core rekeying and proven institutional function design make the 8K Series the leading choice for high-security commercial environments.