BEST 8K Series Grade 1 Heavy D...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$786.00
$498.18
BEST BEST 8K Series - Passage (N) Non-Keyed Grade 1 Heavy Duty Knob Lock BEST-8K-N

BEST 8K Series Grade 1 Heavy Duty Passage Knob Lock with Non-Keyed Operation

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Model: 8K30N4ASTK626
$786.00
$498.18
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$786.00
$498.18
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BEST 8K Series Grade 1 Heavy Duty Passage Knob Lock with Non-Keyed Operation

Premium Heavy-Duty Cylindrical Knob Lock for Commercial Applications

The BEST 8K Series Grade 1 Heavy Duty Passage Knob Lock delivers professional-grade security and durability for high-traffic commercial environments. This non-keyed passage function lock features knobs machined from solid brass or bronze bar stock with a 2 1/8" diameter and 2 7/8" projection from door. Built with a 2 1/16" diameter chassis to fit standard 2 1/8" door holes, the lock includes a 9/16" throw deadlocking latch and accommodates door thicknesses from 1 3/8" to 2" standard. Exceeds ANSI Grade 1 requirements for commercial heavy-duty applications.

Professional Features & Benefits

  • Heavy-Duty Construction: Knobs machined from solid brass or bronze bar stock with steel-reinforced roses for exceptional durability in commercial applications.
  • Grade 1 Performance: Exceeds ANSI Grade 1 requirements for security and reliability with strong retractor springs and premium internal components.
  • Flexible Door Compatibility: 2 1/16" diameter chassis fits standard 2 1/8" door holes with adjustable door thickness from 1 3/8" to 2" standard.
  • Professional Latch System: 9/16" throw deadlocking latch with 2 1/4" x 1 1/8" beveled front fits 1" hole in door edge.
  • Enhanced Security Design: Snap-on inside rose with no exposed screws and friction insert inside rose resists loosening for added security.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis for wear-resistant, smooth operation throughout product life.
  • Versatile Installation: 2 3/4" standard backset with 3 3/4" and 5" options available, plus rotating knob face for easy hand of door changes.
  • Optional Break-Away Protection: Available breakaway feature prevents lockset from being overpowered by wrench attacks for enhanced vandal resistance.

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: Passage/Hall/Closet
  • 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 (1 3/8" to 2" standard), 2 1/8" bore hole, and 1" edge hole for latch.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for proper chassis and latch positioning.
  3. Prepare door by drilling required 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing per specifications.
  4. Install chassis, latch assembly, and mounting hardware securing the device to door per manufacturer torque specifications with appropriate strike plate.
  5. Adjust knob operation and latch alignment for proper function, ensuring smooth operation and proper deadlocking latch engagement.
  6. Test device operation to verify proper passage 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
  • Government and Military Facilities
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • International Projects Without ADA Requirements

Anti-Microbial Option

BEST offers Agion® antimicrobial finish options for healthier door hardware applications. This advanced coating provides continuous antimicrobial protection for enhanced hygiene in healthcare, educational, and high-touch commercial environments.

Why Choose BEST Quality?

BEST 8K Series knob locks deliver professional-grade reliability with solid brass or bronze construction and steel-reinforced components that exceed ANSI Grade 1 requirements. Premium workmanship and carefully designed internal components ensure long-term performance in demanding commercial applications. Engineered for high-traffic environments where dependable operation and enhanced security 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:
Passage/Hall/Closet
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K30N4ASTK626 – Frequently Asked Questions

1) What door prep does the BEST 8K knob lock need, and will it drop into an existing 2-1/8 inch bore?
It drops straight in. The 8K chassis is 2-1/16 inches in diameter, sized for a standard 2-1/8 inch cross bore, and the latch takes a 1 inch hole in the door edge with a 2-1/4 x 1-1/8 inch beveled front. If you are replacing another cylindrical knobset that used the same 2-1/8 inch bore and 2-3/4 inch backset, no new drilling is needed beyond checking the latch face and strike prep line up.
2) Which backset do I order for the BEST 8K knob lock on a wide stile or unusual door?
Two backsets are orderable: 2-3/4 inches, which is the standard commercial backset, and 5 inches for doors where the bore sits farther from the edge. Measure from the door edge to the center of the 2-1/8 inch bore before you order, because the backset is built into the latch and is not field adjustable on this lock.
3) Will the BEST 8K passage latch work with my existing strike plate?
The latch throws 9/16 inch and deadlocks, with a 2-1/4 x 1-1/8 inch beveled front. If the strike already in your frame has the same lip projection and a pocket deep enough for a 9/16 inch throw, it will latch. If you are not sure, the lock is orderable with either a standard strike or an ANSI strike (the 4-7/8 inch type used in most commercial hollow metal frame prep), so pick the one matching your frame cutout rather than reusing an old strike.
4) Which knob locks fit a 2 inch thick door like the BEST 8K does?
The BEST 8K covers 1-3/8 inch to 2 inch as its standard door thickness range and offers a 3-3/8 inch concave thick-door rose. Others that reach 2 inch: the Corbin Russwin CK4310 passage knob at 1-3/8 inch to 2 inch, the Corbin Russwin CK4851 entrance/office knob at 1-3/8 inch to 2 inch, the Falcon X101 passage knobset at 1-3/8 inch to 2-1/4 inch, and the Deltana 6171 Round Knob and 3381 Egg Knob entry sets at 1-3/8 inch to 2 inch. Sets that stop at 1-3/4 inch, including the Arrow MK01, the Corbin Russwin CK4410, the Dexter C2000 passage knob and the Deltana 6901 Portland entry knob, will not reach a 2 inch leaf.
5) What is the closest Grade 1 equivalent to the BEST 8K passage knob lock from another manufacturer?
The Corbin Russwin CK4310 is the nearest match: a Grade 1 passage/closet cylindrical knob lock in the CK4300 Series, non-keyed, with a 1-3/8 inch to 2 inch door thickness range that matches the 8K's 1-3/8 inch to 2 inch standard range. The Schlage D10S passage latch is also Grade 1 heavy duty non-keyed with the Orbit knob, and the Falcon X101 is a Grade 1 heavy duty cylindrical passage knobset that carries a fire rating and covers 1-3/8 inch to 2-1/4 inch doors. All three are non-keyed passage function like the 8K, so the latch retracts from either side with no locking.
6) Is there a lighter duty passage knob lock for interior doors that do not need Grade 1?
Yes. The Falcon W101 is a Grade 2 medium duty cylindrical knob lock with passage/closet latch function on a 2-3/4 inch backset, which is the same backset the BEST 8K uses as standard, and it carries a fire rating. The Corbin Russwin CK4410 is a Grade 2 passage/closet knob with the Global knob for doors 1-3/8 inch to 1-3/4 inch. Arrow's MK01 and RK01 are Grade 2 passage cylindrical knob locks, non-keyed, for the same 1-3/8 inch to 1-3/4 inch thickness range, the RK01 with a ball knob. The Dexter C2000 passage ball knob is Grade 2 non-clutching for 1-3/8 inch to 1-3/4 inch doors. The distinction that matters on the door: all of these top out at 1-3/4 inch, while the 8K is built for 1-3/8 inch to 2 inch and offers a 3-3/8 inch concave thick-door rose.
7) The BEST 8K passage knob does not lock. What should I order for a door that needs to lock?
Passage function on the 8K is non-keyed, so the knob never locks from either side. For a restroom or bedroom that needs a thumbturn, the Dexter C2000 privacy ball knob is a Grade 2 privacy/bed/bath non-keyed knob for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal BER20 is a Grade 3 privacy knob with brass trim for the same range. For a keyed opening, the Corbin Russwin CK4851 is an entrance/office cylindrical lock with a conventional cylinder and a Global knob covering 1-3/8 inch to 2 inch doors, and the Dexter C2000 entry/office ball knob is Grade 2 keyed. For a door that must stay locked outside and always free to exit, the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet knob lock with a single cylinder on a 2-3/4 inch backset, the same backset as the 8K standard.
8) Will a dummy knob work as a substitute for the BEST 8K passage knob?
No. A dummy knob is trim only, with no latch and no moving chassis, so it will not hold a door closed. The BEST 8K passage lock has a working 9/16 inch throw deadlocking latch with a 2-1/4 inch by 1-1/8 inch beveled front. The Schlage A170 single dummy trim, the Cal-Royal BA40 dummy knob, the Bravura Biloxi dummy knobset, and the Omnia 434/0 and 442/00 single dummy latchsets are all dummy function and belong on a fixed inactive leaf or a closet door held by a ball catch, not on a swinging door that needs to latch.
9) Does the BEST 8K passage knob need to be handed, and can I flip it in the field?
No handing to specify. The 8K passage knob is non-handed, and the knob face rotates so the hand of the door can be changed on site. That matters for a property manager buying a box of them for a building: one part number covers left and right hand openings.
10) Passage function knob versus privacy or entrance: which do I need for a hall or closet door?
Passage is the right function for corridor, hall, and closet doors that never need to lock. The 8K in passage (N) function is non-keyed with no locking at all, so both knobs always retract the latch. If the room needs to be secured from inside, that is a privacy function; if it needs a key outside, that is entrance or storeroom. Within the same heavy duty Grade 1 class, Sargent's 8XG04 is the storeroom knob lock with a single cylinder and a 2-3/4 inch backset.
11) Is a Grade 1 knob lock worth it over a Grade 2 for a school or office corridor?
For high-cycle corridor and classroom doors, yes. The 8K is Grade 1 heavy duty with knobs machined from solid brass or bronze bar stock and steel-reinforced roses. The common Grade 2 passage knobs, Corbin Russwin's CK4410 or the Dexter C2000 passage knob, are built for lighter traffic and the Dexter tops out at 1-3/4 inch doors. If you want Grade 1 but need a different brand, the Schlage D10S and Falcon X101 are both Grade 1 heavy duty passage knobsets, and the Corbin Russwin CK4310 is a Grade 1 passage knob covering 1-3/8 to 2 inch doors like the 8K.
12) Can I put a BEST 8K knob lock on a fire rated door?
Function first: a passage latch on a fire door is only acceptable where the opening does not need to latch for the rating, and most rated openings do require a positive-latching, self-latching lock. If the door assembly needs a labeled fire rated knob lock, the Falcon W101 Grade 2 and Falcon X101 Grade 1 cylindrical knob locks are both carried with a fire rating on record, the X101 in heavy duty.
13) Does the BEST 8K passage knob take an interchangeable core?
No core involved. The 8K in passage function is entirely non-keyed, so there is no cylinder, no core, and nothing to key into your masterkey system. If you are standardizing a facility on BEST small format interchangeable core and need this opening keyed, you want a keyed 8K function instead. For a keyed heavy duty passage-style alternative with an interchangeable core, the Falcon X101 is a Grade 1 cylindrical passage knobset built for IC.
14) For a 5 inch backset opening, which passage knob locks are an option besides the BEST 8K?
The BEST 8K is one of the few passage knobs offered with a 5 inch backset alongside the 2-3/4 inch standard. Among other passage knobs, the Falcon W101 is built on a 2-3/4 inch backset and the Baldwin Estate 5000 Baltimore passage knob on a 2-3/8 inch backset, so neither reaches a 5 inch bore-to-edge dimension. If the door is already prepped at 5 inches, the 8K covers it directly; if the prep is standard, the 8K's 2-3/4 inch backset variant and the W101 both land on the same hole.
15) Which passage knobsets are residential grade rather than commercial, and how do they differ from the BEST 8K?
The BEST 8K is a commercial heavy duty Grade 1 knob lock. The residential-grade passage knobs run lighter: the Kwikset 200P Polo passage knob ships with a 6AL latch and RCS round corner strike for interior hall and closet use, the Pamex FTF Baron passage knobset is Grade 3 for 1-3/8 inch to 1-3/4 inch doors, and the Bravura Albany and Lynchburg round-trim passage knobsets are Grade 2. The Baldwin Estate 5011 Colonial passage knob with 5058 rose is a decorative interior passage set. For a facility standardizing on an ANSI/BHMA Grade 1 knob across a corridor, the 8K is the one that carries the Grade 1 rating and the 1-3/8 inch to 2 inch door range.
16) I need a keyless code entry on a passage door instead of a knob that always turns. What is available?
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, so access is controlled by a code rather than a key or a free-turning knob. The BEST 8K passage knob is non-electronic and non-keyed, meaning both knobs always retract the latch with no credential of any kind. Choose the 3830 where the opening needs to restrict who passes without issuing keys, and the 8K where the door only needs to latch.
17) Which passage knob has an antimicrobial finish option for a healthcare corridor?
The BEST 8K is offered in 626AM satin chrome antimicrobial alongside its standard finishes, which covers a high-touch healthcare or educational corridor with a Grade 1 heavy duty knob. Among the other Grade 1 passage knobs, the Corbin Russwin CK4310 comes with the Global knob and the Schlage D10S with the Orbit knob, both non-keyed passage function, and the Falcon X101 passage knobset is fire rated with an interchangeable core. If the antimicrobial surface is the deciding factor, the 8K in 626AM is the one to specify.
18) Is an exit device knob trim the same thing as a BEST 8K knob lock?
No. Exit device trim mounts to a panic device and has no chassis or latch of its own. The Sargent 28C-KNOB is exit device trim with knob and rose in an entrance function for 1-3/4 inch doors, the Sargent 78-2875 is an outside knob only with B design, and the Imperial USA ED-BKL580 is knob trim in a storeroom function. The BEST 8K is a complete cylindrical lockset with a 2-1/16 inch diameter chassis for a 2-1/8 inch bore and a 9/16 inch throw latch into a 1 inch edge hole, so it installs on a bored door on its own.
19) What should I use instead of a BEST 8K knob on an opening that has to meet ADA?
The BEST 8K is a knob-operated lockset, and knob applications are listed for international projects without ADA requirements. Among the peer knob sets the same limitation applies, since the Corbin Russwin CK4310 uses a Global knob, the Schlage D10S an Orbit knob, and the Arrow RK01 and Dexter C2000 passage sets a ball knob. Where the opening must meet ADA, specify a lever trim; where it does not, the 8K carries the Grade 1 heavy duty rating for the same passage function.
20) Can I match BEST 8K knobs to the brass and bronze hardware already on my building's doors?
Ten finishes are offered: 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. Those are BHMA finish codes, so if the hardware you are matching is stamped with one of them you can order the exact same code and get a match across the opening.
21) What knob shape and rose options come on the BEST 8K, and how far does the knob stick out from the door?
Knobs come round or tulip, 2-1/8 inches in diameter, projecting 2-7/8 inches from the door face. That projection matters where a door swings against a wall or into a tight vestibule. Roses come in 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 rose is the one to pick if you are covering scars from previous hardware. The inside rose snaps on with no exposed screws and has a friction insert to keep it from working loose.
22) Is the vandal-resistant breakaway knob available on the BEST 8K passage lock, and when should I spec it?
A breakaway knob feature is offered on the 8K, and it stops the lockset being overpowered by a wrench or pipe applied to the knob. Worth specifying on exposed corridor doors, public restrooms, transit facilities, and anywhere the hardware takes abuse. It is an option you add at order time, not something retrofitted later.
23) I need a matching knob for a door that only needs a pull, no latch. What do I use with the BEST 8K?
The 8K is a working passage latchset, not a dummy. For a closet leaf or an inactive door that just needs a knob to pull on, you want a dummy trim: the Schlage A170 single dummy is a Grade 2 cylindrical non-keyed knob for doors 1-3/8 to 1-7/8 inches thick, and Cal-Royal's BA40 Barrington dummy knob covers 1-3/8 to 1-3/4 inch doors. Neither carries a latch, so no bore prep beyond the mounting is required.
24) Does the BEST 8K come in a round knob, and which other knobsets offer a similar shape?
The BEST 8K is offered in round and tulip knob styles, with the knobs machined from solid brass or bronze bar stock at a 2-1/8 inch diameter and a rotating knob face for hand-of-door changes. For a comparable round shape, the Arrow RK01 and the Dexter C2000 passage set use a ball knob, the Schlage D10S uses the Orbit knob, and the Deltana 6171 Round Knob entry set is a round profile. For a traditional egg shape instead, the Omnia 434/PA is a passage latchset with solid brass construction and a 3 inch projection, against the 8K's 2-7/8 inch projection from the door.
How fast can I get the BEST 8K30N4ASTK626 delivered?
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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 8K30N4ASTK626 come with a warranty?
Absolutely. The BEST 8K30N4ASTK626 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 8K30N4ASTK626?
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