BEST 8K Series Storeroom Funct...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,043.00
$660.37
BEST BEST 8K Series - Storeroom Function (D) Single Cylinder Grade 1 Heavy Duty Knob Lock, SFIC Less Core BEST-8K-D

BEST 8K Series Storeroom Function Grade 1 Heavy Duty Cylindrical Knob Lock with SFIC Core

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Model: 8K37D4ASTK626
$1,043.00
$660.37
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,043.00
$660.37
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BEST 8K Series Storeroom Function Grade 1 Heavy Duty Cylindrical Knob Lock with SFIC Core

Premium Heavy-Duty Cylindrical 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 demanding commercial applications. This storeroom function cylindrical knob lock features a 2 1/16" diameter chassis for 2 1/8" door holes, 9/16" throw deadlocking latch, and accepts BEST interchangeable cores for flexible key management. Designed to exceed ANSI Grade 1 requirements with premium workmanship and corrosion-resistant internal components for long-term reliability.

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 9/16" throw deadlocking latch and strong retractor springs.
  • Enhanced Security Design: Cores must be removed before keyed knobs to deter break-in attempts, with snap-on inside rose featuring no exposed screws for tamper resistance.
  • Flexible Door Compatibility: Adjustable for door thickness from 1 3/8" to 2" standard, with special E trim available for 2 1/8" to 3" doors.
  • Quick Rekeying System: BEST interchangeable core system allows economical rekeying without lock removal for efficient key management.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis ensures wear-resistant, reliable operation.
  • 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 Security Features: Available with breakaway feature to prevent overpowering by wrench, knurled knob for accessibility applications, and spin-free operation.

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: Yes
  • Keyed Function: Single Cylinder
  • Product Attribute: Cylindrical Locks
  • Product Category: Mechanical Locks
  • Product Function: Storeroom
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Product Type: Knobsets
  • Series: 8K Series
  • Standard Cylinder: 7-pin housing, accepts all BEST cores (less SFIC core)
  • Subcategory: Bored Locksets

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness from 1 3/8" to 2", 2 1/8" bore hole, and 1" edge hole for latch housing.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper backset alignment.
  3. Prepare door by drilling 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing per manufacturer specifications.
  4. Install latch assembly in door edge and secure chassis in door bore hole, ensuring proper alignment with strike preparation on frame.
  5. Adjust knob projection and rose positioning for proper door thickness accommodation and smooth operation throughout full range of motion.
  6. Test lock operation with key and verify proper latching, deadlocking function, and smooth knob rotation. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

Anti-Microbial Option

Optional Agion® antimicrobial finish available for enhanced hygiene in healthcare and high-touch applications, providing continuous protection against harmful microorganisms on door hardware surfaces.

Why Choose BEST Quality?

BEST 8K Series cylindrical locks deliver professional-grade reliability with solid brass or bronze construction and steel-reinforced components designed to exceed ANSI Grade 1 performance standards. Premium workmanship and corrosion-resistant internal parts ensure dependable operation in demanding commercial applications where security and durability are essential. Engineered for heavy-duty use with proven reliability in high-traffic environments.

Product Specs

Series:
8K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Single Cylinder
Standard Cylinder:
7-pin housing, accepts all BEST cores (less SFIC core)
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Knobsets
Subcategory:
Bored Locksets
Keyed:
Yes
Electronic:
No
Commercial/Residential:
Commercial
Handle Type:
Knob
Product Attribute:
Cylindrical Locks
Product Function:
Storeroom
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K37D4ASTK626 – Frequently Asked Questions

1) Does the BEST 8K storeroom knob lock come with a core, or do I need to order one separately?
It ships less core. The 8K chassis has a 7-pin housing that accepts all BEST small format interchangeable cores, so you add the core keyed to your system. That is the point of the design for a facility with an existing BEST keyway: you rekey by pulling the core with a control key instead of pulling the lock off the door. Budget the core, and the control key, as a separate line on the order.
2) What door prep does the BEST 8K knob lock need, and will it drop into an existing 161 bore?
Standard cylindrical prep: a 2-1/8 inch bore through the door face and a 1 inch hole in the edge for the latch. The chassis itself is 2-1/16 inch diameter, so it seats in that 2-1/8 inch hole. If the door already carries a standard cylindrical lockset at a matching backset, the holes are already there and you are mainly matching backset and strike.
3) What door thickness will the BEST 8K cylindrical lock fit?
Standard range is 1-3/8 to 2 inches, adjustable. For thicker doors, 2-1/8 up to 3 inches, you have to specify the special E trim. That covers most commercial 1-3/4 inch doors straight out of the box.
4) Which backset should I order for a BEST 8K knob lock, and will it work on a door with a 5 inch backset?
Two backsets are orderable: 2-3/4 inch standard and 5 inch. The 5 inch covers wide-stile and some aluminum or institutional doors where the bore sits further from the edge. The series also offers 3-3/4 inch as an option. Measure from the door edge to the center of the existing 2-1/8 inch bore and match it, since backset is not field adjustable on this chassis.
5) Will the BEST 8K latch work with the strike already in my frame?
The latch has a 9/16 inch throw deadlocking latchbolt. You can order it with either a standard strike or an ANSI strike, so match the frame prep you have: ANSI (4-7/8 inch) prep is the usual commercial hollow metal frame, while a standard T-strike suits wood frames and older prep. If your existing strike box has enough depth for a 9/16 inch throw and the lip is right for the jamb, you can reuse it.
6) What is the closest Grade 1 heavy duty storeroom knob lock to the BEST 8K Series from another manufacturer?
The Sargent 8XG04 is the closest match: a Grade 1 heavy duty storeroom/closet knob lock with a single cylinder and a 2-3/4 inch backset, from the 8X Line Series. The BEST 8K storeroom knob lock is also Grade 1 heavy duty with a single keyed cylinder and a 2-3/4 inch standard backset, and its 7-pin housing accepts all BEST interchangeable cores, so key systems built on BEST small format cores stay intact with the 8K.
7) I need a Grade 1 knob that always stays unlocked instead of storeroom function - what do I use?
Use a Grade 1 passage knobset. The Falcon X101 is a heavy duty Grade 1 cylindrical passage knobset with an interchangeable core, fire rated, for doors 1-3/8 to 2-1/4 inches, and the Schlage D10S is a Grade 1 heavy duty passage latch knob lock with an Orbit knob. The BEST 8K storeroom function is keyed, so the outside knob stays locked and requires a key while the inside knob always retracts the latch.
8) Is there a lighter duty storeroom knob lock if Grade 1 is more than the opening needs?
Yes. The Sargent 6G04 is a Grade 2 standard duty storeroom/closet knob lock with a single cylinder, from the 6 Line Series. The BEST 8K storeroom knob lock is Grade 1 heavy duty with solid brass or bronze knobs and steel-reinforced roses, which is the specification for high-traffic commercial openings; the 6G04 is the standard duty option for the same storeroom function.
9) Will a Kwikset or Master Lock keyed knob work as a replacement for a BEST 8K on a commercial storeroom door?
They are a different class of hardware. The Kwikset 400P-CP keyed entry knob is Grade 3 for doors 1-3/8 to 1-3/4 inches, and the Master Lock BC Series biscuit knob keyed entry is also Grade 3. The BEST 8K is a Grade 1 heavy duty commercial lock with storeroom function, solid brass or bronze knobs, a 9/16 inch throw deadlocking latch, and BEST interchangeable core capability for rekeying without removing the lock.
10) I need a storeroom knob for an exit device, not a bored lock - is the BEST 8K right?
No. For exit device trim, the Imperial USA ED-BKL580 is knob trim with storeroom function for the ED-500 Series, and the Sargent 28C-KNOB is exit device trim with knob and rose for 1-3/4 inch doors. The BEST 8K is a complete cylindrical bored lockset that installs in a 2-1/8 inch bore with a 1 inch edge bore for the latch, not trim mounted to a rim or mortise exit device.
11) Do I have to specify handing for the BEST 8K knob lock?
No. It is non-handed, and the knob face rotates so you can change hand of door in the field. One part number covers left and right hand openings, which simplifies stocking when you are standardizing a building.
12) What knob styles, roses, and finishes can I get on the BEST 8K?
Knob style is round or tulip. Roses are 2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch concave thick-door, or 3-3/8 inch convex, so you can cover old prep scars with the larger rose or keep a tight trim look with the 2-9/16 inch. Finishes run 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 oil-rubbed satin bronze, 619 satin nickel, 625 bright chrome, 626 satin chrome, 626AM satin chrome antimicrobial, and 690 statuary dark bronze. 626 is the usual match for existing commercial hardware.
13) Is a knob lock acceptable, or should I be specifying a lever for accessibility?
Knobs are still specified for storage, mechanical, and utility rooms that are not on an accessible route. Where the opening serves the public or occupants, a lever is generally the required operable hardware, and the 8K is a knob design, so it would be the wrong pick there. For accessibility-related applications on the knob side, BEST offers a knurled knob option, which is the tactile warning treatment for hazardous-area doors.
14) What is the difference between the BEST 8K storeroom knob and a classroom function knob lock?
Function, not grade. The Dexter C2000 classroom cylindrical ball knob lock is Grade 2, keyed and non-clutching, for doors 1-3/8 to 1-3/4 inches; classroom function lets a key lock and unlock the outside knob so the room can be left in a passage state. The BEST 8K storeroom function keeps the outside knob locked at all times and requires the key for every entry, and it is Grade 1 heavy duty.
15) Can I substitute an entrance/office knob lock for the BEST 8K storeroom lock?
They behave differently. The Corbin Russwin CK4851 is an entrance/office cylindrical knob lock with a conventional cylinder for doors 1-3/8 to 2 inches, and entrance/office function allows the outside knob to be left unlocked by a button or turn. The BEST 8K storeroom function has no hold-unlocked feature, so the outside knob cannot be left free, and it uses a 7-pin housing that accepts BEST interchangeable cores rather than a conventional cylinder.
16) For a thick door, does the BEST 8K or a comparable Grade 1 knob lock cover it?
The BEST 8K is adjustable for 1-3/8 to 2 inch doors as standard, with a special E trim for 2-1/8 to 3 inch doors, and a 3-3/8 inch concave thick-door rose is offered. Among Grade 1 peers, the Falcon X101 passage knobset covers 1-3/8 to 2-1/4 inches and the Corbin Russwin CK4310 Grade 1 passage knob covers 1-3/8 to 2 inches, though both are passage rather than storeroom function.
17) I want keyless entry on a storeroom door instead of a keyed BEST 8K knob - what is the option?
The Lockey 3830 is a mechanical keyless combination knob lock with auto-locking passage function for doors 1-3/16 to 2 inches, so entry is by code rather than key. The BEST 8K is a keyed mechanical lock with a single cylinder and no electronic components, using a BEST interchangeable core so the opening can be rekeyed into an existing master key system.
18) Is there an antimicrobial option for healthcare doors?
Yes, order finish 626AM, satin chrome with the Agion antimicrobial treatment, for patient rooms, clinics, and other high-touch openings. It is the same lock otherwise, same storeroom function and same core prep, so it mixes into a facility already standardized on 626 satin chrome.
19) Can someone twist the outside knob off with a wrench on a BEST 8K?
There is an optional breakaway feature that stops the knob being overpowered by a wrench, plus spin-free operation as an option. Security is also built into the core design: the core must be removed before the keyed knob can come off, and the inside rose snaps on with no exposed screws. Worth specifying the breakaway on exterior or unsupervised openings.
20) Is a dummy knob an alternative to the BEST 8K on an inactive leaf?
For an inactive leaf with no latching, yes - dummy trim is the correct choice. The Schlage A170 single dummy trim is a Grade 2 non-keyed knob, and the Cal-Royal BA40 dummy knob covers 1-3/8 to 1-3/4 inch doors. Neither latches or locks. The BEST 8K is a keyed storeroom lock with a 9/16 inch throw deadlocking latch, intended for an active, secured opening.
21) Does the BEST 8K have an antimicrobial option that decorative brass knobsets do not?
Yes. The BEST 8K storeroom knob lock is offered in 626AM satin chrome antimicrobial, using the Agion antimicrobial finish for healthcare and high-touch openings. Decorative solid brass knobsets such as the Omnia 434/PA passage latchset and the Deltana 6171 round knob entry are catalogued without an antimicrobial finish choice and are non-Grade-1 residential-style trim rather than heavy duty commercial storeroom locks.
How fast can I get the BEST 8K37D4ASTK626 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 8K37D4ASTK626 come with a warranty?
Absolutely. The BEST 8K37D4ASTK626 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 8K37D4ASTK626?
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 8K37D4ASTK626 from ZenSupply?
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