BEST 6K Series Exit Function G...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$218.00
$198.29
BEST BEST 6K Series - Exit (Y) Function Grade 2 Non-Keyed Knob Locks BEST-6K-Y

BEST 6K Series Exit Function Grade 2 Non-Keyed Cylindrical Knob Lock

(No reviews yet) Write a Review

Model: 6K30Y4CSTK626
$218.00
$198.29
Selected Finish is
Selected Strike is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$218.00
$198.29
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

BEST 6K Series Exit Function Grade 2 Non-Keyed Cylindrical Knob Lock

Professional Grade 2 Cylindrical Lock Solution

The BEST 6K Series Exit Function knob lock delivers reliable performance for standard traffic commercial applications. This Grade 2 cylindrical lock features a 2 1/8" bore mounting system 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 non-keyed exit function lock exceeds ANSI Grade 2 standards for dependable long-term service.

Professional Features & Benefits

  • Door Compatibility: Designed for 1 3/8" to 1 7/8" door thickness with 2 1/8" diameter bore for versatile installation options.
  • Grade 2 Performance: Exceeds ANSI Grade 2 standards and meets BHMA A156.2, Series 4000, Grade 2 requirements for commercial applications.
  • Durable Construction: Brass and bronze component parts with internal steel mechanisms featuring corrosion treatment for normal atmospheric conditions.
  • Quick Rekeying System: BEST interchangeable core allows rapid rekeying without disassembly for enhanced security management.
  • Fire Rating Compliance: UL Listed for use on 3-hour A label single doors (4' x 8') for code compliance applications.
  • Reversible Operation: Lockset reversible for either hand of door without removing keyed knob for installation flexibility.
  • Concealed Mounting: Snap-on inside rose with no exposed mounting screws and threaded outside rose adjustable for door thickness.
  • Deadlocking Security: 1/2" throw deadlocking latch with standard 2 3/4" x 1 1/8" curved lip strike for reliable latching performance.

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: Exit
  • 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"), 2 1/8" diameter bore, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces including 1" or 7/8" diameter latch tube bore.
  3. Prepare door and frame by drilling required holes 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 Series 4000 Grade 2 performance. Engineered for demanding commercial applications where dependable 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:
Exit
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 6K30Y4CSTK626 – Frequently Asked Questions

1) Will the BEST 6K knob lock fit a 1-3/8 inch wood door and a 1-3/4 inch metal door?
Both work. The 6K covers door thickness from 1-3/8 to 1-7/8 inches, with a threaded outside rose that adjusts to the thickness, so the same lock handles standard 1-3/4 inch commercial doors and older 1-3/8 inch interior doors. Door prep is a 2-1/8 inch cross bore plus a 1 inch or 7/8 inch latch tube bore.
2) Which backset do I order for a BEST 6K exit knob lock?
Four backsets are offered: 2-3/8 inch, 2-3/4 inch, 3-3/4 inch and 5 inch. Measure center of the existing bore to the door edge. Commercial openings are almost always 2-3/4 inch; 2-3/8 inch shows up on lighter residential-prep doors, and the 3-3/4 and 5 inch options exist for wide-stile or special prep doors where the hole sits farther in.
3) Can the BEST 6K exit lock go on a fire rated door?
Yes. The 6K is UL Listed for use on 3-hour A label single doors up to 4 by 8 feet, and the 1/2 inch throw latch is deadlocking, which is what a fire door needs for positive latching. It also meets BHMA A156.2, Series 4000, Grade 2.
4) I want the inside to open freely but I still need to key in from outside. What should I buy instead?
Not the 6K exit function, which has no outside cylinder at all. For keyed outside entry with free inside egress, look at a storeroom or entrance function knob lock: the Sargent 6G04 Grade 2 storeroom knob or the Corbin Russwin CK4851 entrance/office knob, which fits 1-3/8 to 2 inch doors. Both take a cylinder; the 6K Y does not.
5) Is a passage knob lock the same thing as the BEST 6K exit function lock?
They are not the same function. The BEST 6K covered here is an exit function, non-keyed cylindrical knob lock. A passage latch has no locking action from either side at all: the Arrow MK01 and Arrow RK01 are Grade 2 non-keyed passage/hall/closet knob locks, the Dexter C2000 passage ball knob is Grade 2 non-keyed passage, and the Falcon W101 is a Grade 2 medium duty passage/closet latch with a 2-3/4 inch backset. Confirm the function code on the door schedule before substituting one for the other.
6) What is the closest Grade 1 alternative to the BEST 6K exit function knob lock for a high-traffic opening?
The BEST 6K knob lock is a Grade 2 medium duty cylindrical lockset. If the opening calls for Grade 1 heavy duty in a non-keyed knob, the Schlage D10S passage latch is a Grade 1 heavy duty cylindrical non-keyed knob lock with an Orbit knob, and the Falcon X101 is a Grade 1 heavy duty cylindrical passage knobset with an interchangeable core and a 1-3/8 inch to 2-1/4 inch door thickness range. The Corbin Russwin CK4310 is a Grade 1 non-keyed passage/closet cylindrical lock with a Global knob covering 1-3/8 inch to 2 inch doors.
7) The opening needs to be locked from the outside with a key, not exit only. What knob lock should I use instead?
The BEST 6K exit function lockset is non-keyed, so it cannot be secured with a key. For keyed commercial knob functions, the Sargent 6G04 is a Grade 2 standard duty storeroom/closet knob lock with a single cylinder, the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet single cylinder knob lock with a 2-3/4 inch backset, the Dexter C2000 entry/office ball knob is Grade 2 keyed, and the Dexter C2000 classroom ball knob is Grade 2 keyed.
8) Which knob lock matches the BEST 6K door thickness range for a 1-7/8 inch door?
The BEST 6K accepts door thickness from 1-3/8 inch to 1-7/8 inch with a threaded outside rose adjustable for thickness. Among comparable knob products, the Schlage A170 single dummy trim lists the same 1-3/8 inch to 1-7/8 inch range, while the Corbin Russwin CK4310 passage/closet lock and the Deltana 6171 Round Knob entry go to 2 inch. Many Grade 2 and Grade 3 knobsets, including the Arrow MK01 and the Dexter C2000 series, stop at 1-3/4 inch.
9) We need extended backsets. Do the alternatives to the BEST 6K cover a 5 inch backset?
The BEST 6K is offered in 2-3/8 inch, 2-3/4 inch, 3-3/4 inch and 5 inch backsets with either an ANSI strike or the standard strike. Among the comparable knob locks, backset choice is generally fixed: the Falcon W101 is listed at 2-3/4 inch, the Sargent 8XG04 at 2-3/4 inch, and the Baldwin Estate 5000 passage and Omnia 458/0 at 2-3/8 inch. For a wide stile or an out-of-standard prep, the extended backsets keep you in the 6K family.
10) Is this knob lock handed? I don't know the handing of the door yet.
Handing is not a problem here. The 6K lockset is reversible for either hand of door, and on the exit function there is no keyed outside knob to remove, so you set the hand during install rather than at order time. One part number covers left and right hand openings.
11) Which rose size should I pick to cover up the old lock's marks?
Two rose diameters are offered: the standard 2-9/16 inch and a larger 3-3/8 inch. The bigger rose is the one to use when you are replacing an older lock that left a wider paint ring or scuffed area around the bore. The inside rose snaps on with no exposed mounting screws, and the outside rose threads on so it can be run to the door thickness.
12) What finishes does the BEST 6K knob come in if I need to match existing hardware across a building?
Seven BHMA 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. Satin chrome (626) is the usual commercial standard for schools and offices. Brass and bronze parts with corrosion-treated internal steel means these are rated for normal atmospheric conditions, not coastal or pool-room exposure.
13) Is Grade 2 medium duty enough for a school corridor, or should I go Grade 1?
The 6K is Grade 2, medium duty, which suits standard-traffic commercial openings: offices, tenant spaces, back-of-house, most retail. For a high-abuse main corridor or a door cycled constantly, step up to a Grade 1 cylindrical knob such as the Schlage D Series passage knob or the Sargent 8XG04 storeroom knob, both listed as heavy duty Grade 1.
14) What is the difference between the BEST 6K exit function and a plain passage knob set?
A passage latch turns from both sides and is only there to hold the door closed. The 6K exit function turns from the inside only, so the outside knob will not retract the latch and the door cannot be entered from outside. If you actually want two-way free operation, a Grade 2 passage knob like the Corbin Russwin CK4410 (1-3/8 to 1-3/4 inch doors) or the Dexter C2000 passage ball knob is the right item.
15) Will a Grade 3 knob lock work in place of the BEST 6K on an office door?
The BEST 6K is a Grade 2 commercial medium duty knobset, so a Grade 3 set is a step down on the ANSI/BHMA scale and may not satisfy a Grade 2 spec. Grade 3 knob options include the Cal-Royal BER00 entrance/office knob lock with a Kwikset keyway for 1-3/8 inch to 1-3/4 inch doors, the Pamex FTF Baron in entrance/office, privacy, and passage functions for 1-3/8 inch to 1-3/4 inch doors, and the Kwikset 400P-CP keyed entry knob for 1-3/8 inch to 1-3/4 inch doors.
16) What should I use instead of the BEST 6K on a restroom or bedroom door?
The BEST 6K is an exit function, non-keyed set and has no inside privacy locking. For privacy openings, the Dexter C2000 privacy ball knob is Grade 2 non-keyed privacy, the Cal-Royal BER20 is a Grade 3 privacy knob lock with brass trim for 1-3/8 inch to 1-3/4 inch doors, the Pamex FTF Baron privacy is Grade 3 for the same thickness range, and the Deltana 6112 St. Thomas privacy knob covers 1-3/8 inch to 2 inch doors.
17) Is BEST 6K interchangeable core the only knob lock option if we key to an IC system?
The BEST 6K series uses the BEST interchangeable core for rekeying without disassembly, though the exit function set itself is non-keyed. The Falcon X101 is the other interchangeable core knobset in the comparable range, a Grade 1 heavy duty cylindrical passage knobset. Keyed cylindrical knob alternatives such as the Corbin Russwin CK4851 entrance/office use a conventional cylinder rather than an IC format.
18) Can I use a residential knob set in place of the BEST 6K in an apartment building?
The BEST 6K is a commercial Grade 2 cylindrical knobset with a 1/2 inch throw deadlocking latch, UL Listed for 3-hour A label single doors. Residential-style knobs are built to a different intent: the Kwikset 200P Polo passage knob ships with a 6AL latch and round corner strike, the Schlage Residential F500 Plymouth with Georgian knob is a combo pack with adjustable backsets and dual strikes for 1-3/8 inch to 1-3/4 inch doors, and the Baldwin Estate 5000 Baltimore passage knob comes preconfigured with a 2-3/8 inch backset and full lip strike. Check the fire and grade requirement on the opening before choosing between them.
19) Will a Sargent 28C knob trim work as a substitute for the BEST 6K knob lock?
No. The Sargent 28C-KNOB is exit device trim with a knob and rose in an entrance function for 1-3/4 inch doors, and the Sargent 78-2875 is an outside knob only. Those mount to an exit device, not to a bored door. The BEST 6K is a complete cylindrical knob lockset for a 2-1/8 inch bore with its own latch and strike, so the two are not exchangeable on the same opening.
20) What is the difference between the BEST 6K exit knob lock and the Corbin Russwin CK4410?
Both are Grade 2 non-keyed cylindrical knob locks. The Corbin Russwin CK4410 is a passage/closet function with a Global knob and a 1-3/8 inch to 1-3/4 inch door thickness range. The BEST 6K covered here is an exit function set for 1-3/8 inch to 1-7/8 inch doors, with a 1/2 inch throw deadlocking latch and finishes from 605 bright brass through 626 satin chrome.
21) Does the BEST 6K exit lock take a BEST interchangeable core?
The 6K Series is built around the BEST interchangeable core system for fast rekeying without pulling the lock apart, but the exit (Y) function is non-keyed, so no core is used or needed on this one. If you are standardizing a building on BEST cores, order the keyed 6K functions for the doors that need keying and use the Y function only where outside entry is not wanted.
How fast can I get the BEST 6K30Y4CSTK626 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 6K30Y4CSTK626 come with a warranty?
Absolutely. The BEST 6K30Y4CSTK626 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 6K30Y4CSTK626?
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 6K30Y4CSTK626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!