BEST 8K Series Exit Non-Keyed ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$786.00
$522.54
BEST BEST 8K Series - Exit (Y) Non-Keyed Grade 1 Heavy Duty Knob Lock BEST-8K-Y

BEST 8K Series Exit Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock

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Model: 8K30Y4ASTK626
$786.00
$522.54
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$786.00
$522.54
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BEST 8K Series Exit Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock

Premium Heavy-Duty Cylindrical Knob Lock for Commercial Applications

The BEST 8K Series delivers Grade 1 heavy-duty performance with knobs machined from solid brass or bronze bar stock for exceptional durability. This non-keyed exit function lock features a 2 1/16" diameter chassis designed for 2 1/8" door holes with adjustable door thickness from 1 3/8" to 2". The 9/16" throw deadlocking latch provides reliable security while exceeding ANSI Grade 1 requirements for commercial applications.

Professional Features & Benefits

  • Heavy-Duty Construction: Knobs machined from solid brass or bronze bar stock with steel-reinforced roses for exceptional durability in high-traffic applications.
  • Grade 1 Performance: Exceeds ANSI Grade 1 requirements for security and reliability with proven performance in demanding commercial environments.
  • Adjustable Door Compatibility: Standard door thickness range of 1 3/8" to 2" with special E trim available for 2 1/8" to 3" doors.
  • Precision Engineering: 2 1/16" diameter chassis fits standard 2 1/8" door holes with 9/16" throw deadlocking latch for secure operation.
  • Enhanced Security Features: Snap-on inside rose with no exposed screws and optional breakaway feature prevents lockset from being overpowered by wrenches.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis ensures wear-resistant, reliable performance.
  • Versatile Installation: Standard 2 3/4" backset with 3 3/4" and 5" options available, plus multiple rose styles including 3 3/4" round and 2 9/16" round configurations.
  • Corrosion Resistance: Internal components treated for corrosion resistance with brass or corrosion-treated steel construction for long product life.

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: 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: 8K Series
  • Subcategory: Bored Locksets

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness range of 1 3/8" to 2" and 2 1/8" bore hole diameter.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for the selected backset configuration.
  3. Prepare door by drilling the required 2 1/8" diameter hole for the chassis and 1" hole in door edge for the latch housing.
  4. Install the chassis, latch assembly, and trim components according to manufacturer specifications, ensuring proper alignment of the 9/16" throw deadlocking latch.
  5. Adjust knob operation and rose positioning for smooth function throughout the full range of motion, utilizing the rotating knob face feature for proper door hand configuration.
  6. Test lockset operation to verify proper latch engagement and smooth knob operation. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Military Facilities
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • High-Traffic Commercial Environments

Break-Away Protection Design

The optional breakaway feature prevents the lockset from being overpowered by a wrench, providing enhanced vandal resistance in vulnerable installations. This security enhancement helps protect the lock mechanism from forced entry attempts while maintaining normal operational functionality.

Why Choose BEST Quality?

BEST 8K Series cylindrical knob locks deliver professional-grade reliability with solid brass or bronze construction that exceeds ANSI Grade 1 requirements for demanding commercial applications. The precision-machined components and corrosion-treated internal parts ensure long-term performance in high-traffic environments. Engineered for dependable security where reliable access control and durability are essential.

Product Specs

Series:
8K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Non-Keyed
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
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K30Y4ASTK626 – Frequently Asked Questions

1) Which backsets can I order the BEST 8K knobset in?
Two backsets are orderable: 2-3/4 inch, which is the standard commercial backset, and 5 inch for doors with wide stiles or narrow-glass openings. The 8K family also documents a 3-3/4 inch option. Measure from the door edge to the center of the bore before you pick.
2) Will the 8K latch engage my existing strike, or do I need to change it?
The latch is a deadlocking type with a 9/16 inch throw. You can order the lockset with either a standard strike or an ANSI strike, so if your frames are already prepped to the ANSI 4-7/8 inch cutout, choose the ANSI strike and reuse the prep; on older frames with a small lip strike, take the standard strike.
3) I need a knob on this door that locks with a key. Is the BEST 8K the right part?
No. The 8K exit function has no cylinder and no keyway at all. For a keyed opening look at a keyed function instead, such as the Sargent 8XG04 Grade 1 storeroom knob lock on a 2-3/4 inch backset, or the Corbin Russwin CK4851 entrance/office with a conventional cylinder. Keep the 8K for doors that only need free egress.
4) Is a knob trim for an exit device the same thing as the BEST 8K exit function knob lock?
No. The Sargent 28C-KNOB is exit device trim with a knob and rose for 1-3/4 inch doors, the Sargent 78-2875 is an outside knob only for the 7800 Series, and the Imperial USA ED-BKL580 is knob trim in the ED-500 Series - all of those mount to a separate exit device. The BEST 8K exit (Y) function is a standalone cylindrical knob lockset with a 2-1/16 inch chassis for a 2-1/8 inch bore and its own deadlocking latch.
5) What is the closest Grade 1 non-keyed cylindrical knob lock to the BEST 8K exit function from another manufacturer?
Two close Grade 1 non-keyed knob options are the Schlage D10S passage latch with Orbit knob, listed as Grade 1 heavy duty in the D Series, and the Corbin Russwin CK4310 passage/closet cylindrical lock, listed as Grade 1 with a Global knob and a 1-3/8 inch to 2 inch door thickness range. The BEST 8K is also Grade 1 heavy duty and non-keyed, with a 1-3/8 inch to 2 inch adjustable door thickness range and 2-3/4 inch or 5 inch backset choices. The difference to check is function: the 8K here is the exit (Y) function, while the D10S and CK4310 are catalogued as passage latch functions.
6) Is there a Grade 1 knobset that takes an interchangeable core if I need the opening keyed instead of exit function?
The Falcon X101 is a heavy duty Grade 1 cylindrical passage knobset in the X Series with an interchangeable core, a fire rating, and a 1-3/8 inch to 2-1/4 inch door thickness range. For a keyed Grade 1 knob, the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet single cylinder knob lock with a 2-3/4 inch backset. The BEST 8K exit function is non-keyed, so if the opening needs a key on the outside one of those keyed functions is the right direction.
7) Which knob products look like a substitute for the BEST 8K exit lock but will not actually latch a door?
Dummy trims are the common mix-up. The Schlage A170 single dummy trim, Cal-Royal BA40 dummy knob, Bravura Biloxi dummy knobset, Omnia 434/0 and 458/0 single dummy latchsets, and the Emtek Hammered Egg and Georgetown dummy pairs are all catalogued as dummy function, meaning fixed trim with no latch operation. The Sargent 78-2875 is an outside knob only. The BEST 8K exit function is a complete cylindrical lockset with a 9/16 inch throw deadlocking latch.
8) Do any comparable knob locks handle a door thicker than 1-3/4 inch?
Yes. The Falcon X101 Grade 1 knobset covers 1-3/8 inch to 2-1/4 inch, the Corbin Russwin CK4310 and CK4851 cover 1-3/8 inch to 2 inch, and the Deltana 6171 round knob entry is listed for 1-3/8 inch to 2 inch. The BEST 8K is adjustable from 1-3/8 inch to 2 inch as standard, with special E trim for 2-1/8 inch to 3 inch doors and a 3-3/8 inch concave thick-door rose option.
9) Do I have to worry about handing when ordering the 8K exit knob lock?
No. The 8K is non-handed, and the knob face rotates so you can set it for the door's hand during install. One part number covers left and right openings, which is why property managers can stock a single lock for a whole building.
10) Which rose and knob styles do I choose to match the other doors in the building?
Knob style is Round or Tulip. Roses come in 2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch convex, and a 3-3/8 inch concave thick-door version. The larger 3-3/8 inch rose is the one to pick if you are covering an old prep or scars from a previous lock; the thick-door rose goes with the deeper door applications.
11) What finishes does the BEST 8K knob lock come in, and is there an antimicrobial option?
Ten finishes: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 619 satin nickel, 625 bright chrome, 626 satin chrome, 626AM satin chrome antimicrobial, and 690 statuary dark bronze. The 626AM is the one healthcare and food service specs usually call for.
12) Is the 8K knob lock strong enough for a high-traffic school or hospital corridor?
It's built for that duty. Grade 1, heavy duty, commercial rated, with knobs machined from solid brass or bronze bar stock, steel-reinforced roses, and a steel retractor on low-friction bearings. Internal parts are corrosion treated. There is also an optional breakaway feature so the knob can't be twisted off with a pipe wrench.
13) Can I use a cheaper Grade 2 or Grade 3 knob lock instead of the BEST 8K on an exit door?
You can where traffic is light and no spec demands Grade 1, but you are stepping down. Options like the Dexter C2000 passage knob and Corbin Russwin CK4410 are Grade 2, and the Pamex FTF passage and Cal-Royal BER20 are Grade 3. Most of those list a narrower 1-3/8 to 1-3/4 inch door range, so on a thicker door the 8K's 1-3/8 to 2 inch range is the one that fits. Institutional specs that call out ANSI/BHMA Grade 1 rule the lighter sets out entirely.
14) For a lower-traffic interior door, what is a lighter-duty alternative to the BEST 8K knob lock?
For lighter interior traffic, the Corbin Russwin CK4410 passage/closet knob lock is Grade 2 with a 1-3/8 inch to 1-3/4 inch door thickness range, the Falcon W101 is a Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset and a fire rating, and the Dexter C2000 passage ball knob is Grade 2 for 1-3/8 inch to 1-3/4 inch doors. The BEST 8K is Grade 1 heavy duty and covers doors from 1-3/8 inch to 2 inch, which is the range to stay with on thicker leaves.
15) I need a bathroom or bedroom door instead of an exit function knob - what should I order?
Privacy function is the one to specify. Options include the Dexter C2000 privacy ball knob, Grade 2 for 1-3/8 inch to 1-3/4 inch doors, the Cal-Royal BER20 Grade 3 privacy knob lock for the same door range, the Pamex FTF Baron in Grade 3 privacy, and the Deltana 6112 St. Thomas privacy knob for 1-3/8 inch to 2 inch doors. The BEST 8K exit function is non-keyed with no privacy locking, so it is not the right choice for a bath or bedroom.
16) What knob lock should I use if the door needs an entrance function with a key outside?
Keyed entrance knob options include the Corbin Russwin CK4851 entrance/office cylindrical lock with a Global knob and conventional cylinder, listed as Grade 1 for 1-3/8 inch to 2 inch doors, the Dexter C2000 entry/office ball knob in Grade 2 for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal BER00 entrance/office Grade 3 knob with a Kwikset keyway. The BEST 8K exit function is non-keyed, so it cannot be cylinder-prepped for outside key control.
17) Which knob locks in this class are residential-grade and not suited to a commercial corridor?
The Kwikset 400P-CP Polo keyed entry knob is Grade 3 for 1-3/8 inch to 1-3/4 inch doors, the Master Lock BC01 biscuit knob keyed entry is Grade 3, the Callan Canova and Santo entrance knobsets are Grade 3, and the Delaney Belton, Galway, and Olivia entrance knobsets are Grade 3. The BEST 8K is Grade 1 heavy duty and catalogued for commercial use, with knobs machined from solid brass or bronze bar stock and steel-reinforced roses.
18) Is the BEST 8K knob lock electronic or does it need any wiring?
Purely mechanical. The 8K is a bored cylindrical knob lock with no electronics, no power feed, and no wiring in the door, so no electrified hinge or transfer is needed and it keeps working when the building loses power.
19) If I need a keyless combination knob lock instead of a mechanical exit function, what is available?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function, listed for doors 1-3/16 inch to 2 inch thick. The BEST 8K exit function is a non-electronic mechanical lockset with no code entry, so credential-free coded access is the point of difference.
How fast can I get the BEST 8K30Y4ASTK626 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 8K30Y4ASTK626 come with a warranty?
Absolutely. The BEST 8K30Y4ASTK626 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 8K30Y4ASTK626?
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
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