BEST 6K Series Double Dummy Tr...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$232.00
$146.26
BEST 6K Series Double Dummy Trim Grade 2 Cylindrical Knob Lock

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

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Model: 6K02DT4C626
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$232.00
$146.26
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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.

Product Specs

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

BEST 6K02DT4C626 – Frequently Asked Questions

1) What does double dummy trim mean on the BEST 6K 2DT knob lock?
Double dummy means a fixed knob on each face of the door with no latch and no key. The 6K 2DT is a non-keyed dummy function, so the knobs do not turn or retract anything. Use it on inactive leaves of a pair, on closet or cabinet doors held shut by ball catches or roller catches, or where you want the opening to match the operating hardware on the rest of the building without any latching action.
2) Will the BEST 6K dummy knob fit a 1-3/4 inch commercial door?
Yes. The 6K Series covers door thickness from 1-3/8 to 1-7/8 inches, so a standard 1-3/4 inch commercial leaf is in the middle of that range, and older 1-3/8 inch interior doors work too. The outside rose is threaded so it adjusts to the actual thickness, and the inside rose snaps on with no exposed screws.
3) Can I use a dummy knob on a fire-rated door?
The BEST 6K Series is UL listed for use on 3-hour A label fire-rated single doors up to 4 by 8 feet. Note the function, though: dummy trim does not latch. A fire door assembly has to positively latch, so a dummy is only appropriate on an inactive leaf or an opening that is not part of the rated latching function. If the leaf must latch, order a latching 6K function instead.
4) What is the difference between a single dummy and this double dummy trim?
A double dummy gives you two knobs, one per face, for an opening that gets pulled from both sides. A single dummy is one knob on one face only, typically for an inactive leaf you never touch from the back. If you only need one side, the Schlage A170 single dummy trim is the Grade 2 cylindrical equivalent and covers 1-3/8 to 1-7/8 inch doors, the same thickness range as the 6K. Ordering a double when you need a single leaves you with a spare knob; ordering a single when you need a double leaves a bare face.
5) Do I need a strike or a latch with the BEST 6K double dummy trim?
No strike is used with a dummy, because there is no latchbolt to catch. Hold the door shut with a ball catch, roller catch, or magnetic catch instead. If you are ordering other 6K functions for the same job, those use the standard 2-3/4 by 1-1/8 inch strike with a curved lip, which is worth knowing when you are matching frame prep across a run of openings.
6) What is the closest commercial equivalent to the BEST 6K double dummy knob trim from another manufacturer?
The Schlage A170 is the nearest commercial match. It is a Grade 2 cylindrical non-keyed knob lock in dummy function from the A Series, and it carries the same 1-3/8 inch to 1-7/8 inch door thickness range as the BEST 6K, which is also Grade 2 and non-keyed in dummy function. The A170 is catalogued as single dummy trim, so on a pair of doors or a double door where you want knob trim on both faces, you would order two of them against one BEST 6K double dummy set.
7) I only need dummy trim on one face of the door - what should I use instead of a double dummy set?
The BEST 6K 2DT is a double dummy, meaning knob trim on both faces. For a single face, single dummy options include the Schlage A170 single dummy trim, a Grade 2 non-keyed cylindrical knob lock, and the Omnia 458/0 single dummy knob latchset, which is built with a 2-3/8 inch backset and solid brass construction. The Omnia 442/00 is another single dummy knob latchset with a 2-5/8 inch rose.
8) The door actually needs to latch - what takes the place of the BEST 6K dummy trim?
Dummy trim does not latch; the BEST 6K 2DT is a non-keyed dummy function with no operating latch retraction. If the door has to latch, a Grade 2 passage knob in the same knob format includes the Corbin Russwin CK4410 passage/closet cylindrical lock with a Global knob and a 1-3/8 to 1-3/4 inch door range, the Dexter C2000 passage ball knob, or the Falcon W101 passage/closet knob lock with a 2-3/4 inch backset. For Grade 1, the Schlage D10S passage latch and the Falcon X101 passage knobset are heavy duty.
9) Does the BEST 6K double dummy need a 2-1/8 inch bore in the door?
The 6K Series is a cylindrical lockset built around a 2-1/8 inch diameter bore, so it mounts in the same standard cross-bore prep as the keyed and passage functions in the family. That is what makes it useful on an existing opening: if a door already has a bored cylindrical prep, the dummy trim drops into it rather than requiring a new pattern.
10) Which rose size should I order to match the other BEST knobs in my building?
Two rose diameters are offered: the standard 2-9/16 inch and a larger 3-3/8 inch. The 3-3/8 inch is the one to pick when you are covering wear rings, paint shadows, or an oversize prep left by previous hardware. Measure the existing rose footprint on a door you are matching before you commit, since the larger rose will hide a mark the standard one will not.
11) Is a Grade 2 knob lock good enough for a school or office corridor?
Grade 2 under BHMA A156.2 Series 4000 is medium duty, which suits standard commercial traffic. On a dummy function the grade matters mostly for the trim and finish holding up to hands and cleaning rather than for cycle life, since nothing retracts. The 6K uses brass and bronze components with corrosion-treated internal steel. For heavy-traffic latching openings in the same building, step up to a Grade 1 cylindrical such as the Sargent 8XG04 or the Schlage D Series.
12) Does the BEST 6K dummy knob need to be ordered handed?
Handing is not a concern here. The 6K lockset is reversible for either hand of the door, and a dummy has no latch or cylinder to orient in the first place, so one part number covers left and right hand openings.
13) Can I put a BEST interchangeable core in the 6K double dummy trim later?
No. The 2DT is a non-keyed dummy with no cylinder cavity and no latch, so there is nothing for a core to operate. The BEST interchangeable core system runs on the keyed 6K functions, where a core can be pulled and swapped without taking the lockset off the door. If an opening may need to be keyed later, specify a keyed 6K function now rather than planning to convert a dummy.
14) Is there a Grade 1 dummy knob alternative for a heavier-traffic opening?
Among commercial knob locks, the Grade 1 options are latching functions rather than dummy trim: the Corbin Russwin CK4310 passage/closet knob is Grade 1 with a 1-3/8 to 2 inch door range, the Falcon X101 is a Grade 1 heavy duty passage knobset with an interchangeable core, and the Sargent 8XG04 is a Grade 1 storeroom/closet knob lock with a 2-3/4 inch backset. Since dummy trim takes no cycling load, the BEST 6K 2DT Grade 2 double dummy remains appropriate on high-traffic openings where the trim is decorative only.
15) Which knob locks look like a substitute for the BEST 6K dummy trim but are not?
Several knob products share the look but not the function. The Sargent 78-2875 outside knob only with B design and the Sargent 28C-KNOB exit device trim are exit device trims, not standalone bored dummy trim, as is the Imperial USA ED-BKL580 knob trim in storeroom function. Privacy and entrance knobs such as the Dexter C2000 privacy ball knob or the Cal-Royal BER00 Grade 3 entrance/office knob carry locking hardware the BEST 6K 2DT does not, since the 6K double dummy is non-keyed with no locking function at all.
16) My door is thicker than 1-3/4 inches - which knob locks cover that?
The BEST 6K 2DT covers 1-3/8 inch to 1-7/8 inch doors. If you need more range, the Corbin Russwin CK4310 Grade 1 passage knob and the CK4851 entrance/office knob both list 1-3/8 to 2 inch, the Deltana 3381 Egg, 6171 Round and 6112 St. Thomas knobs list 1-3/8 to 2 inch, and the Falcon X101 Grade 1 passage knobset goes to 2-1/4 inch. These are latching functions rather than dummy trim.
17) I need keyed knobs on the same doors as the BEST 6K dummy trim so the set matches - what keyed knob locks pair with it?
The BEST 6K 2DT is non-keyed dummy trim and the 6K series itself uses the BEST interchangeable core system for rekeying without removing the lockset, so keyed 6K functions are the direct match. If you are mixing brands, keyed Grade 2 cylindrical knob locks include the Sargent 6G04 storeroom/closet knob with single cylinder, the Dexter C2000 entry/office ball knob for 1-3/8 to 1-3/4 inch doors, and the Corbin Russwin CK4851 entrance/office knob with conventional cylinder.
How fast can I get the BEST 6K02DT4C626 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the BEST 6K02DT4C626 come with a warranty?
Absolutely. The BEST 6K02DT4C626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the BEST 6K02DT4C626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the BEST 6K02DT4C626 from ZenSupply?
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