BEST 6K Series Double Dummy Trim Grade 2 Cylindrical Knob Lock

BEST 6K Series Double Dummy Trim Grade 2 Cylindrical Knob Lock

Professional Non-Keyed Cylindrical Lock Solution

The BEST 6K Series Double Dummy Trim cylindrical knob lock delivers Grade 2 performance for standard traffic commercial applications. This non-keyed dummy function lockset features a 2 1/8" diameter cylindrical case with 1/2" throw deadlocking latch and accommodates door thickness from 1 3/8" to 1 7/8". Built with brass and bronze components plus corrosion-treated internal steel mechanisms, this lockset exceeds ANSI Grade 2 standards and is UL listed for 3-hour fire-rated doors.

Professional Features & Benefits

• Door Compatibility: Accommodates door thickness from 1 3/8" to 1 7/8" with 2 1/8" diameter bore for standard commercial installations.
• Grade 2 Performance: Exceeds ANSI Grade 2 standards and BHMA A156.2 Series 4000 Grade 2 certification for reliable medium-duty applications.
• Fire Rating Compliance: UL listed for use on 3-hour A label fire-rated single doors up to 4' x 8' for code compliance.
• Durable Construction: Brass and bronze component parts with corrosion-treated internal steel mechanisms for long-term reliability in normal atmospheric conditions.
• Quick Core System: BEST interchangeable core system allows rapid rekeying without lockset removal for efficient key management.
• Concealed Mounting: Snap-on inside rose design eliminates exposed mounting screws for clean appearance and tamper resistance.
• Reversible Operation: Lockset reversible for either hand of door without removing keyed knob for installation flexibility.
• Multiple Backset Options: Available in 2 3/8", 2 3/4", 3 3/4", and 5" backsets across the 6K series for various door configurations.

Technical Specifications

• Commercial/Residential: Commercial
• Department: Door Hardware
• Duty Level: Medium Duty
• Electronic: No
• Grade: Grade 2
• Handle Type: Knob
• Keyed: No
• Keyed Function: Non-Keyed
• Product Attribute: Cylindrical Locks
• Product Category: Mechanical Locks
• Product Function: Dummy
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Series: 6K Series
• Standard Latch: 1/2" Throw
• Standard Strike: 2-3/4" x 1-1/8" with Curved Lip
• Subcategory: Bored Locksets

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness from 1 3/8" to 1 7/8", 2 1/8" diameter bore, and appropriate backset for the specific 6K series model.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for the cylindrical case and latch assembly.
3. Prepare door by drilling the required 2 1/8" diameter bore for lock housing and 1" or 7/8" diameter hole for latch tube as specified.
4. Install the latch assembly and secure the cylindrical lock housing to door per manufacturer torque specifications using concealed mounting hardware.
5. Adjust the threaded outside rose for proper door thickness and ensure snap-on inside rose is properly seated with no exposed mounting screws.
6. Test dummy function operation to verify proper knob movement and alignment. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Commercial Office Buildings
• Educational Facilities
• Healthcare Institutions
• Retail Establishments
• Industrial and Warehouse Facilities
• Multi-Tenant Residential Properties
• Government and Municipal Buildings

Why Choose BEST Quality?

BEST 6K Series cylindrical locks deliver professional-grade reliability with brass and bronze construction and corrosion-treated internal mechanisms rated to exceed ANSI Grade 2 standards. UL listed for 3-hour fire-rated applications and BHMA certified for Series 4000 Grade 2 performance. Engineered for demanding commercial applications where dependable medium-duty performance and quick rekeying capability are essential.