BEST 6K Series Privacy Functio...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$291.00
$205.21
BEST BEST 6K Series - Privacy (L) Function Grade 2 Non-Keyed Knob Locks BEST-6K-L

BEST 6K Series Privacy Function Grade 2 Cylindrical Knob Lock

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Model: 6K30L4CSTK626
$291.00
$205.21
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$291.00
$205.21
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BEST 6K Series Privacy Function Grade 2 Cylindrical Knob Lock

Professional Privacy Lock Solution for Commercial Applications

The BEST 6K Series Privacy Function Cylindrical Knob Lock delivers Grade 2 performance for standard traffic commercial applications. This non-keyed privacy lock 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 and internal steel mechanisms with corrosion treatment, this lockset exceeds ANSI Grade 2 standards for reliable long-term performance.

Professional Features & Benefits

  • Door Thickness Compatibility: Standard installation for 1 3/8" to 1 7/8" door thickness with threaded outside rose adjustment for precise fit.
  • Grade 2 Performance: Exceeds ANSI Grade 2 standards and BHMA A156.2 Series 4000 Grade 2 listing for commercial reliability.
  • Durable Construction: Brass and bronze component parts with internal steel mechanisms featuring corrosion treatment for normal atmospheric conditions.
  • Quick Core System: BEST interchangeable core allows rapid rekeying without lockset removal for flexible key management.
  • Concealed Mounting: Snap-on inside rose design eliminates exposed mounting screws for clean professional appearance.
  • Universal Installation: Lockset reversible for either hand of door without removing keyed knob for installation flexibility.
  • Fire Rating Compliance: UL Listed for use on 3-hour A label single doors (4' x 8') for code compliance applications.
  • Multiple Backset Options: Available in 2 3/8", 2 3/4", 3 3/4", and 5" backsets (62K, 63K, 64K, 65K 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: Privacy/Bed/Bath
  • 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 (1 3/8" to 1 7/8" standard), backset selection, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes (2 1/8" diameter bore for lock housing, 1" or 7/8" diameter for latch tube) and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. 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 internal steel mechanisms rated to exceed ANSI Grade 2 standards. UL Listed for 3-hour fire rating applications and BHMA certified for commercial performance. Engineered for demanding commercial applications where dependable privacy function and long-term durability 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:
Privacy/Bed/Bath
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 6K30L4CSTK626 – Frequently Asked Questions

1) Will the BEST 6K privacy knob lock fit a 1-3/8 inch door, and what about a thicker 1-7/8 inch door?
Both work. The 6K Series privacy knob lock covers 1-3/8 inch through 1-7/8 inch doors, and the outside rose is threaded so you dial it in to the actual door thickness rather than swapping parts. That range covers standard 1-3/4 inch commercial doors and older 1-3/8 inch interior doors alike.
2) Which backset do I order for a BEST 6K privacy knob lock?
Four backsets are offered: 2-3/8 inch, 2-3/4 inch, 3-3/4 inch and 5 inch, which correspond to the 62K, 63K, 64K and 65K prefixes. Measure from the door edge to the center of the 2-1/8 inch bore. 2-3/8 and 2-3/4 are the two usual ones; the 3-3/4 and 5 inch versions exist for wide-stile or special frame conditions.
3) Can I use the BEST 6K privacy knob on a fire rated door?
The 6K privacy lockset is UL Listed for 3-hour A label single doors up to 4 feet by 8 feet. The 1/2 inch throw deadlocking latch is what carries that listing, so use the latch and strike supplied with the lock, not a substitute.
4) Does this BEST privacy knob take a key or a BEST interchangeable core?
It doesn't. The privacy (L) function is non-keyed: it locks from the inside with a button or turn and releases from the outside by emergency means only. If you need a BEST small format interchangeable core for keyed control, you want a keyed function in the 6K family instead, such as an entrance or storeroom function.
5) Will the BEST 6K latch drop into my existing strike, or do I need to cut the frame?
The standard strike is 2-3/4 inch by 1-1/8 inch with a curved lip, which is the common frame prep on bored lock openings, and the latch throws 1/2 inch. If your frame is prepped for a full ANSI strike (4-7/8 inch face), order the S3 ANSI strike option instead and you won't have to fill and re-route the jamb.
6) What door prep does a BEST 6K knob lock need?
Standard bored prep: a 2-1/8 inch diameter cross bore through the face of the door for the lock case, and a 1 inch or 7/8 inch edge bore for the latch tube, at the backset you ordered. Frame gets the strike cutout. If the door already has 2-1/8 inch bored prep from another cylindrical knob lock, the 6K goes straight in.
7) The door does not need to lock, just latch. What should I order instead of the BEST 6K privacy knob?
Use a passage knob lock instead. The Corbin Russwin CK4410 is a Grade 2 non-keyed passage/closet cylindrical knob lock for doors 1-3/8 inch to 1-3/4 inch, and the Falcon W101 is a Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset. The BEST 6K in the L function is privacy/bed/bath, meaning it has an inside locking button, which a hall or closet door does not need.
8) What is the closest equivalent to the BEST 6K privacy knob lock from another commercial brand?
The Dexter C2000 Series privacy knob lock is the nearest match in function and grade. Like the BEST 6K privacy knob, it is a Grade 2 non-keyed cylindrical knob lock with Privacy/Bed/Bath function. The Dexter unit uses a ball knob and is rated for doors 1-3/8 inch to 1-3/4 inch thick, while the BEST 6K privacy lock covers 1-3/8 inch to 1-7/8 inch, so on a thicker 1-7/8 inch door the BEST is the one that fits.
9) Will a Schlage A170 work as a substitute for a BEST 6K privacy knob?
No. The Schlage A170 is a single dummy trim, a Grade 2 non-keyed knob with no latch and no locking button. It shares the same 1-3/8 inch to 1-7/8 inch door thickness range as the BEST 6K, but a dummy is surface-mounted trim for an inactive leaf. If you need the door to latch and lock from inside, the 6K privacy function with its 1/2 inch throw deadlocking latch is the correct part.
10) Do I have to specify handing on a BEST 6K privacy knob lock?
No handing to call out. The 6K lockset is reversible for either hand of door and the change is made without removing the knob, so one part covers left and right hand openings. That matters for a property manager stocking spares across a building.
11) Which rose size should I pick for the BEST 6K knob?
Two rose diameters are offered: the 2-9/16 inch standard and a 3-3/8 inch rose. Go with the larger 3-3/8 inch rose when you are replacing an older lockset that left a bigger footprint or scarring on the door face, so you cover the marks. The inside rose snaps on with no exposed mounting screws either way.
12) Is a Grade 2 knob lock like the BEST 6K enough for a school or hospital restroom, or should I go Grade 1?
Grade 2 medium duty is the standard-traffic commercial tier and the 6K is rated to exceed ANSI Grade 2 and is BHMA A156.2 Series 4000 Grade 2 listed, with brass and bronze parts over corrosion-treated internal steel. For a high-abuse opening where a Grade 1 knob is specified, the Sargent 8XG04 (Grade 1, heavy duty) or Schlage D Series D10S are the heavy duty knob options, though those are storeroom and passage functions rather than privacy.
13) What are my other options if I need a privacy knob lock and the BEST 6K is not the right fit?
For the same Grade 2 commercial tier, the Dexter C2000 privacy ball knob covers 1-3/8 to 1-3/4 inch doors. If the opening is lighter duty, Cal-Royal BER20 and Pamex FTF privacy knobs are Grade 3, both 1-3/8 to 1-3/4 inch. On a decorative residential door, Deltana 6112 St. Thomas privacy knob handles 1-3/8 to 2 inch. Note that only the BEST 6K here reaches a 1-7/8 inch door with 3-3/4 and 5 inch backset choices.
14) Is there a lower-grade privacy knob lock for light-traffic bedroom and bath doors?
Yes. The Cal-Royal BER20 and the Pamex FTF Baron are both Grade 3 privacy knob locksets for doors 1-3/8 inch to 1-3/4 inch thick. The BEST 6K privacy knob is Grade 2 and is specified as commercial, medium duty, so for a commercial corridor or a school restroom the 6K carries the higher ANSI grade; for interior residential-style doors the Grade 3 units cover the same privacy function.
15) I need a Grade 1 knob lock for a high-traffic opening. What are my options?
For heavy duty service, the Schlage D10S passage latch and the Falcon X101 passage knobset are Grade 1 cylindrical knob locks, and the Falcon X101 accepts an interchangeable core and covers doors 1-3/8 inch to 2-1/4 inch. The Sargent 8XG04 is a Grade 1 heavy duty storeroom knob lock with a 2-3/4 inch backset. The BEST 6K privacy knob is Grade 2 medium duty, so a Grade 1 unit is the move where the spec calls for heavy duty, though those three are passage and storeroom functions rather than privacy.
16) Is the Cal-Royal BER00 or a Kwikset 400P an alternative to the BEST 6K privacy knob?
Not for the same opening. The Cal-Royal BER00 is a Grade 3 entrance/office knob lock with a Kwikset keyway and the Kwikset 400P-CP is a Grade 3 keyed entry knob for doors 1-3/8 inch to 1-3/4 inch. Both are keyed entry functions, meaning they take a key from outside. The BEST 6K in the L function is non-keyed privacy, so it is the wrong swap if the opening needs to be keyed and the right one if it does not.
17) What Grade 2 knob lock should I use for a storeroom door on the same floor as BEST 6K privacy knobs?
The Sargent 6G04 is a Grade 2 standard duty storeroom/closet knob lock with a single cylinder, which suits a storage or janitor door that must stay locked and be opened by key. The BEST 6K privacy knob is non-keyed with an inside button and matches it on Grade 2, so you can pair the two across a floor while keeping the correct function on each opening.
18) What finishes does the BEST 6K privacy knob come in to match the rest of my building?
Seven finishes: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 625 bright chrome and 626 satin chrome. 626 satin chrome is the usual commercial standard, so it is the safe match on most institutional openings.
19) Is the BEST 6K privacy knob an electrified or electronic lock?
Purely mechanical. There is no electrified option on the 6K privacy knob, no wiring, no power draw, and it keeps working in an outage. If access control is the goal on that opening, this is not the lock for it.
20) What privacy knob should I use on a residential or decorative opening instead of the BEST 6K?
For a decorative interior door, the Deltana 6112 St. Thomas privacy knob covers doors 1-3/8 inch to 2 inch and the Baldwin Estate 5077 Bethpage privacy knob with R027 rose and the Baldwin Estate 5000 Baltimore privacy knob with a 2-3/8 inch backset and full lip strike are all privacy-function knobs with period styling. The BEST 6K privacy knob is the commercial-specified option, offered in 605 through 626 architectural finishes.
How fast can I get the BEST 6K30L4CSTK626 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 6K30L4CSTK626 come with a warranty?
Absolutely. The BEST 6K30L4CSTK626 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 6K30L4CSTK626?
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 6K30L4CSTK626 from ZenSupply?
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