BEST 8K Series Privacy Non-Key...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$904.00
$557.96
BEST BEST 8K Series - Privacy (L) Non-Keyed Grade 1 Heavy Duty Knob Lock BEST-8K-L

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

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Model: 8K30L4ASTK626
$904.00
$557.96
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$904.00
$557.96
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BEST 8K Series Privacy Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock

Premium Grade 1 Heavy-Duty Cylindrical Knob Lock for Commercial Applications

The BEST 8K Series Privacy Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock delivers dependable security for high-traffic commercial applications. This premium knob set features knobs machined from solid brass or bronze bar stock with a 2 1/8" diameter and 2 7/8" projection from door. Designed with a 2 1/16" diameter chassis to fit standard 2 1/8" door holes and adjustable for door thickness from 1 3/8" to 2", this Grade 1 lock exceeds ANSI requirements for security and reliability with a 9/16" throw deadlocking latch.

Professional Features & Benefits

  • Grade 1 Heavy-Duty Construction: Exceeds ANSI Grade 1 requirements with knobs machined from solid brass or bronze bar stock for exceptional durability in commercial applications.
  • Precision Dimensions: 2 1/8" diameter knobs with 2 7/8" projection and 2 1/16" diameter chassis designed for standard 2 1/8" door bore holes.
  • Adjustable Door Compatibility: Standard adjustment accommodates door thickness from 1 3/8" to 2" with special E trim available for 2 1/8" to 3" doors.
  • Enhanced Security Features: Snap-on inside rose with no exposed screws and rotating knob face for easy hand-of-door changes without knob removal.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis ensures wear-resistant, reliable performance.
  • Professional Latch System: 9/16" throw deadlocking latch with 2 1/4" x 1 1/8" beveled front fits standard 1" edge bore.
  • Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liner for long product life.
  • Optional Breakaway Protection: Available breakaway feature prevents lockset damage from wrench attacks while maintaining security integrity.

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: Privacy/Bed/Bath
  • 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 from 1 3/8" to 2" and standard 2 1/8" bore hole with 1" edge bore for latch.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for the 2 1/16" diameter chassis.
  3. Prepare door by drilling required 2 1/8" bore hole and 1" edge bore as specified in manufacturer instructions.
  4. Install chassis and secure the lockset components to door per manufacturer torque specifications using threaded rose system.
  5. Adjust knob alignment and rose positioning for proper operation and verify smooth knob rotation throughout full range of motion.
  6. Test lockset operation to verify proper latch function with 9/16" throw 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
  • Government and Military Facilities
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • International Projects Without ADA Requirements

Why Choose BEST Quality?

BEST 8K Series cylindrical locks deliver professional-grade reliability with solid brass or bronze construction and Grade 1 certification that exceeds ANSI requirements for security and durability. The precision-machined components and corrosion-resistant internal parts ensure dependable performance in demanding commercial applications. Engineered for high-traffic environments where reliable access control and long-term performance 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:
Privacy/Bed/Bath
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K30L4ASTK626 – Frequently Asked Questions

1) Will the BEST 8K Series privacy knob lock fit a 2 inch thick door?
Yes. The 8K Series cylindrical knob lock adjusts for door thickness from 1-3/8 inches to 2 inches as standard, which covers everything from an older 1-3/8 inch interior door up through heavy 2 inch commercial doors. If you are working with a thicker door, special E trim is available to take it from 2-1/8 inches to 3 inches. Note that 2 inch and thicker doors generally want the 3-3/8 inch concave thick-door rose rather than the standard concave rose.
2) What door prep does a BEST 8K knob lock need, and will it drop into an existing 2-1/8 inch bore?
Standard cylindrical prep. The chassis is 2-1/16 inches in diameter so it goes straight into a standard 2-1/8 inch cross bore, and the latch takes a 1 inch edge bore. The latch front is 2-1/4 x 1-1/8 inches beveled. If the door already carries a bored lockset in that prep, the 8K goes in without redrilling the face.
3) Does the BEST 8K privacy knob come in a 5 inch backset for a door with a wide stile or a push plate?
Both 2-3/4 inch standard and 5 inch backsets are offered on the 8K Series. The 5 inch is what you order when the knob needs to sit further off the door edge, typically on a wider stile or where trim or a plate crowds the standard position. Backset is an order-time choice, so specify it up front.
4) Do I have to specify handing when ordering a BEST 8K knob lock?
No. The 8K is non-handed, and the knob face rotates so you can change hand of door without pulling the knob off. For a property manager stocking spares across a building, that means one part covers left and right hand openings.
5) Will the BEST 8K latch throw into my existing strike?
The latch is a deadlocking latch with a 9/16 inch throw, and the lock can be ordered with either a standard strike or an ANSI strike. If the frame is already prepped for an ANSI 4-7/8 inch strike, order the ANSI version so the new lock matches the existing frame cutout; if it is a standard T-strike prep, take the standard strike. Ordering the wrong one means chiseling the frame.
6) Can a knob lock be used on an ADA-required opening?
No. A knob requires grasping and twisting, which is why the 8K Series is called out for international projects without ADA requirements. On any opening where ADA operable-hardware rules apply, specify a lever instead. Knobs are still fine on the non-regulated openings in the same building.
7) Is there a lighter-duty privacy knob lock for a bathroom door in a low-traffic building?
Yes. The Dexter C2000 privacy ball knob is a Grade 2 privacy/bed/bath cylindrical knob for doors 1-3/8 inch to 1-3/4 inch thick, and the Pamex FTF Baron and Cal-Royal BER20 are Grade 3 privacy knob locksets over the same 1-3/8 inch to 1-3/4 inch range. The BEST 8K privacy knob sits at Grade 1 heavy duty and adjusts to 2 inch doors, so it covers thicker doors and higher-cycle traffic than that set.
8) I need a keyed lock on the same door prep instead of a privacy knob. What are my options?
The BEST 8K privacy knob is non-keyed. For a keyed cylindrical knob in the same family of openings, the Corbin Russwin CK4851 is an entrance/office knob lock with a conventional cylinder rated Grade 1 for 1-3/8 inch to 2 inch doors, and the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet single cylinder knob lock with a 2-3/4 inch backset, which matches the standard backset the 8K is offered in. Sargent 6G04 covers the same storeroom function at Grade 2 standard duty.
9) Which knob products look like a substitute for a privacy knob lock but will not lock the bathroom door?
Dummy and passage trim will not. The Schlage A170 is single dummy trim with no latch action, and the Emtek Hammered Egg, Georgetown and Providence knobsets are sold as dummy pairs, as are the Omnia 434/0 and 442/00 latchsets and the Bravura Biloxi knobset. Passage products such as the Arrow MK01 and RK01 latch the door but have no privacy function. The BEST 8K carries a privacy/bed/bath function, so only another privacy-function lock replaces it on a bed or bath door.
10) My doors are thicker than 1-3/4 inch. Which commercial knob locks handle that?
The BEST 8K adjusts from 1 3/8 inch to 2 inch as standard, with special E trim for 2 1/8 inch to 3 inch doors. Among comparable commercial knob locks, the Corbin Russwin CK4310 passage and CK4851 entrance/office both list 1-3/8 inch to 2 inch, and the Falcon X101 Grade 1 passage knobset lists 1-3/8 inch to 2-1/4 inch. Grade 2 and Grade 3 sets such as the Dexter C2000 passage and Cal-Royal BER00 stop at 1-3/4 inch.
11) What do I need to specify when ordering a BEST 8K privacy knobset?
Five choices decide the part: backset (2-3/4 inch standard or 5 inch), knob style (round or tulip), rose (2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch concave thick-door, or 3-3/8 inch convex), strike (ANSI or standard), and finish. Nothing else is keyed or cored on a privacy function, so there is no keyway or core to call out.
12) How much does a BEST 8K knob stick out from the door face?
The knob measures 2-1/8 inches in diameter with a 2-7/8 inch projection from the door. That matters where a door swings into a tight corridor, next to a wall return, or where an adjacent door leaf or cabinet could clash with the knob at full swing.
13) Is a Grade 1 knob lock overkill for a restroom or bedroom door, or should I use a Grade 2?
Grade 1 is the heavy duty tier, and the 8K is built for it: knobs machined from solid brass or bronze bar stock, brass or corrosion-treated steel internals, and roses reinforced with a steel liner. On a school restroom, a healthcare bed/bath door, or a dorm, that traffic justifies it. On a low-traffic private office or a residential unit interior, a Grade 2 privacy knob like the Dexter C2000 Series privacy ball knob covers the same function at a lighter duty level, and the Cal-Royal BER20 is a Grade 3 privacy knob for light residential use.
14) I need a matching passage or storeroom lock for the other doors on the same corridor. What pairs with a Grade 1 knob lock?
Privacy is a bed/bath function only, so hall, closet and storeroom doors need a different function on the same opening style. For a Grade 1 heavy duty knob to sit alongside it, the Falcon X101 is a Grade 1 heavy duty passage knobset with interchangeable core prep and a 1-3/8 to 2-1/4 inch door range, the Schlage D10S is a Grade 1 heavy duty passage latch with an orbit knob, and the Sargent 8XG04 is a Grade 1 heavy duty storeroom knob lock on a 2-3/4 inch backset. Finishes will not match BEST exactly across brands, so keep one brand per corridor if appearance matters.
15) Which rose size should I order on a BEST 8K knob lock?
Four roses are offered: 2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch concave for thick doors, and 3-3/8 inch convex. The larger 3-3/8 inch sizes are the ones to pick when you are covering wear rings or an oversized cutout left behind by the old lock; the 2-9/16 inch concave is the smaller footprint. The inside rose snaps on with no exposed screws.
16) Is there an antimicrobial finish option on the BEST 8K knob for a healthcare facility?
Yes, 626AM satin chrome antimicrobial is one of the ten finishes offered, alongside 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, and 690 statuary dark bronze. For patient room bath doors and other high-touch openings, 626AM matches standard 626 visually while carrying the antimicrobial treatment.
17) Is the BEST 8K privacy knob an electronic or keyed lock?
Neither. It is a mechanical, non-keyed privacy function: it locks from the inside for a bed or bath door and has no cylinder, no key and no electronics. If you need a key override or credential control on that door, you want a keyed function such as the Corbin Russwin CK4851 Grade 1 entrance/office knob lock, which takes a conventional cylinder and fits 1-3/8 to 2 inch doors.
18) What privacy knob should I use on a residential-style interior door where the commercial look is not wanted?
The Deltana 6112 St. Thomas privacy knob covers 1-3/8 inch to 2 inch doors with a decorative knob, and the Baldwin Estate 5077 Bethpage privacy knob with R027 rose and the Baldwin Estate 5000 Baltimore privacy knob with 5148 rose and 2-3/8 inch backset are traditional-styled privacy sets. The BEST 8K privacy knob is a commercial Grade 1 knob offered in round and tulip knob styles on 2-3/4 inch and 5 inch backsets.
19) I need a fire-rated knob lock for a rated opening. Which comparable knob locks carry a fire rating?
Two in the comparable range list a fire rating: the Falcon X101 Grade 1 heavy duty passage knobset and the Falcon W101 Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset. Both are passage function rather than privacy, so they suit a rated corridor or closet door rather than a bed or bath door.
20) Is a Kwikset or Schlage residential knob an equivalent replacement for a BEST 8K knob in an apartment building?
They are different classes of product. The Kwikset 400P-CP Polo keyed entry knob is Grade 3 for 1-3/8 inch to 1-3/4 inch doors, the Kwikset 200P Polo is a passage knob with a 6AL latch and round corner strike, and 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. The BEST 8K is a commercial Grade 1 heavy duty knob with knobs machined from solid brass or bronze bar stock and a 9/16 inch throw deadlocking latch, offered with an ANSI strike option.
21) What should I use instead of a knob if the opening needs lever operation or exit device trim?
A knob lock does not cover those openings. For exit device trim with a knob, the Sargent 28C-KNOB is trim with knob and rose in an entrance function for 1-3/4 inch doors, and the Imperial USA ED-BKL580 is knob trim in a storeroom function for the ED-500 series. The BEST 8K is a bored cylindrical knob lock for a standard 2 1/8 inch bore with a 1 inch edge bore, so it fits a bored door prep rather than an exit device.
22) What is the difference between the Corbin Russwin CK4310 and CK4410 when matching a Grade 1 commercial knob?
The CK4310 is the Grade 1 global knob passage/closet lock in the CK4300 series and adjusts for doors 1-3/8 inch to 2 inch. The CK4410 is the Grade 2 global knob passage/closet lock in the CK4400 series and covers 1-3/8 inch to 1-3/4 inch. If you are matching the Grade 1 heavy duty level of the BEST 8K, the CK4310 is the one that lines up.
23) Does the BEST 8K privacy knob resist someone twisting it off with a wrench?
An optional breakaway feature is available on the 8K that prevents damage to the lockset from wrench attacks while keeping the lock secure. It is worth calling out on the order for restrooms in public buildings, transit facilities, or anywhere the knob is exposed to abuse. Beyond that, the chassis uses a steel retractor on low friction bearings with a long bearing length for wear resistance.
24) Which knob lock should I choose for a door that needs keyless combination entry rather than a privacy button?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function for doors 1 3/16 inch to 2 inch thick. It replaces the credential, not the privacy function: the BEST 8K privacy knob is a non-electronic, non-keyed lock intended for bed and bath openings.
25) I need a classroom-function knob on one door in the same building. What matches?
The Dexter C2000 classroom ball knob lock is a Grade 2 keyed classroom function for doors 1-3/8 inch to 1-3/4 inch. It is a keyed lock, unlike the non-keyed BEST 8K privacy knob, so plan for cylinder and keying on that opening.
How fast can I get the BEST 8K30L4ASTK626 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 8K30L4ASTK626 come with a warranty?
Absolutely. The BEST 8K30L4ASTK626 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 8K30L4ASTK626?
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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