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

BEST 8K Series Dormitory Function Single Cylinder Grade 1 Heavy Duty Knob Lock

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Model: 8K37T4ASTK626
$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 Dormitory Function Single Cylinder Grade 1 Heavy Duty Knob Lock

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

The BEST 8K Series delivers dependable security for high-traffic commercial environments with Grade 1 heavy-duty construction. This dormitory function single cylinder knob lock features knobs machined from solid brass or bronze bar stock with a 2 1/16" diameter chassis designed to fit 2 1/8" door holes. The 9/16" throw deadlocking latch provides reliable security, while the adjustable door thickness accommodation from 1 3/8" to 2" ensures versatile installation compatibility.

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 high-traffic applications.
  • Chassis Specifications: 2 1/16" diameter chassis fits standard 2 1/8" door holes with adjustable door thickness from 1 3/8" to 2" for versatile installation options.
  • Deadlocking Latch System: 9/16" throw deadlocking latch with 2 1/4 x 1 1/8" beveled front provides reliable security and smooth operation.
  • Enhanced Security Design: Keyed knob removable only after core removal, snap-on inside rose with no exposed screws, and no keeper hole on keyed knobs for added security protection.
  • BEST Interchangeable Core System: Quick, economical rekeying with BEST interchangeable core technology and 7-pin housing that accepts all BEST cores (less SFIC core).
  • Rotating Knob Face: Allows easy hand of door change without removing the knob, plus steel retractor with low friction bearings for smooth, wear-resistant operation.
  • Optional Breakaway Protection: Available breakaway feature prevents the lockset from being overpowered by a wrench for vandal-resistant applications.
  • Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel with brass or bronze roses reinforced with steel liner for long-term durability.

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: Corridor/Dormitory
  • 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 (1 3/8" to 2" standard), 2 1/8" bore hole, and 1" latch hole dimensions.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper chassis and latch alignment.
  3. Prepare door by drilling required 2 1/8" diameter hole for chassis and 1" hole in door edge for latch housing per manufacturer specifications.
  4. Install chassis, latch assembly, and mounting hardware, securing the device to door per manufacturer torque specifications with threaded roses.
  5. Adjust knob alignment and test rotating knob face functionality for proper hand of door operation and smooth movement throughout full range of motion.
  6. Test lock operation with interchangeable core installed to verify proper function, deadlocking latch engagement, and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

Why Choose BEST Quality?

BEST 8K Series knob locks deliver professional-grade reliability with solid brass or bronze construction that exceeds ANSI Grade 1 requirements for demanding commercial applications. The premium workmanship includes corrosion-treated internal components and carefully designed features like steel retractors with low friction bearings for long-term performance. Engineered for high-traffic environments where dependable security and smooth operation are essential, backed by BEST’s proven track record in commercial door hardware solutions.

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:
Corridor/Dormitory
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K37T4ASTK626 – Frequently Asked Questions

1) What does dormitory function mean on a BEST 8K knob lock, and is that the right function for a student room door?
Dormitory function on the 8K Series means corridor/dormitory operation: the outside knob is locked or unlocked by key, and the inside knob always retracts the latch for free egress. It is a single cylinder lock, keyed on the outside only. That is the function used on student rooms and corridor doors where the occupant keys in from the hall and walks out without a key. If you want a door that stays locked outside at all times and never unlocks by key rotation, you want a storeroom function instead, such as the Sargent 8XG04 Grade 1 storeroom knob lock.
2) What door prep does a BEST 8K knob lock need, and will it drop into an existing 161 bore?
The 8K needs a 2-1/8 inch cross bore in the face and a 1 inch hole in the door edge for the latch. The chassis measures 2-1/16 inches in diameter, so it drops straight into a standard 2-1/8 inch bored prep, which is what most existing cylindrical knob doors already have. Backset is where you have to pay attention: 2-3/4 inch is the standard option and a 5 inch backset version is also offered for doors with wide stiles or narrow lites.
3) Will the BEST 8K latch into the strike that is already in my frame?
The 8K latch throws 9/16 inch and is deadlocking, with a 2-1/4 x 1-1/8 inch beveled front. That front size is the standard cylindrical latch face, so it reuses most existing knob lock latch preps in the door edge. On the frame side you pick your strike when you order: a standard strike or an ANSI strike. If your frame is prepped for the 4-7/8 inch ANSI strike, which is typical on hollow metal commercial frames, order the ANSI strike and you will not have to touch the jamb.
4) Does the BEST 8K come with a core, or do I have to order cores separately?
It ships less core. The 8K has a 7-pin housing that takes any BEST small format interchangeable core, so you order the cores separately and key them into your existing BEST system. That is the point of buying it this way: a locksmith or facility keyshop pins the cores and rekeying later is a core swap, not a lock teardown. Budget a core plus a control key for every opening.
5) What is the closest Grade 1 heavy duty knob lock to the BEST 8K Series if a different brand is specified on the job?
The Sargent 8XG04 is the closest peer on grade and duty. It is a Grade 1, heavy duty single cylinder knob lock in the 8X Line Series with a 2-3/4 inch backset, and the BEST 8K Series is likewise a Grade 1 heavy duty single cylinder knob lock offered with a 2-3/4 inch standard backset. The functions differ: the 8XG04 is storeroom, where the 8K covered here is corridor/dormitory. Storeroom keeps the outside knob locked at all times, so if the opening needs the dormitory behavior the function has to be matched separately.
6) Which knob lock other than the BEST 8K Series takes an interchangeable core for a facility keyed on a small format system?
The Falcon X101 is the other interchangeable core knobset in the group: a Grade 1 heavy duty cylindrical passage knobset with an interchangeable core, fire rated, and a 1-3/8 inch to 2-1/4 inch door thickness range. The BEST 8K Series uses a 7-pin housing that accepts all BEST cores and ships less core. The X101 is passage, so it carries no cylinder in service - it is the match for the unkeyed openings in a building where the keyed doors run BEST 8K.
7) What goes on the unkeyed doors in a building where the entry doors use BEST 8K knob locks?
For the closets, halls and interior doors that need no key, the Corbin Russwin CK4310 is the Grade 1 non-keyed match - a passage/closet cylindrical lock with a Global knob and a 1-3/8 inch to 2 inch door thickness range, the same thickness range the BEST 8K accommodates. The Schlage D10S is another Grade 1 heavy duty non-keyed passage latch with an Orbit knob in the D Series. Both keep the corridor at Grade 1 while leaving the keyed openings to the 8K.
8) Which keyed knob lock fits a thicker commercial door when the BEST 8K is being considered?
The BEST 8K Series adjusts from 1 3/8 inch to 2 inch door thickness. Among keyed peers, the Corbin Russwin CK4851 entrance/office cylindrical lock with a Global knob covers the same 1-3/8 inch to 2 inch range. Most of the Grade 2 and Grade 3 keyed knobs stop at 1-3/4 inch - the Dexter C2000 entry/office and the Cal-Royal BER00 entrance/office both list 1-3/8 inch to 1-3/4 inch - so on a 2 inch door those are ruled out on thickness before function even comes up.
9) Which knob lock should be used for a classroom door instead of a BEST 8K dormitory function?
The BEST 8K Series covered here is a corridor/dormitory function. For a classroom opening, the Dexter C2000 Series classroom cylindrical ball knob lock is a Grade 2 keyed, non-clutching classroom function for 1-3/8 inch to 1-3/4 inch doors. Function is what changes: classroom is keyed from the outside only and the inside knob is always free, which is a different lockdown behavior from dormitory. Confirm the function letter against the drawing before ordering either.
10) Do I need to specify handing when I order a BEST 8K knob lock?
No. The 8K is non-handed. The knob face rotates so you can change hand of door without pulling the knob off, which means one part number covers left and right hand openings and your stockroom carries half the inventory. Handy on a fleet of dorm or corridor doors where the swings are mixed.
11) What do I have to specify when ordering a BEST 8K knob lock?
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. There are ten finishes, from 605 bright brass through 626 satin chrome and 690 statuary dark bronze, including 626AM satin chrome antimicrobial. Cores are a separate line item.
12) Is a Grade 1 knob lock worth it over a Grade 2 for a dorm or apartment corridor?
On a door that gets cycled dozens of times a day, yes. The 8K is Grade 1 heavy duty, with knobs machined from solid brass or bronze bar stock, brass or corrosion treated steel internals, and roses reinforced with a steel liner. Grade 2 knob locks such as the Dexter C2000 entry or the Corbin Russwin CK4410 are built to a lighter cycle and strength standard and belong on interior and lower traffic openings. For a back office or a closet inside the same building, Grade 2 saves money without hurting you; for the corridor door itself, Grade 1.
13) What is the alternative to a BEST 8K if I do not run BEST interchangeable cores?
The 8K only makes sense inside a BEST SFIC keying system, since the housing is 7-pin and takes BEST cores. If your building is keyed on a different system, the Falcon X101 is the closest thing in the same class: Grade 1, heavy duty, cylindrical knob with interchangeable core, and it fits 1-3/8 to 2-1/4 inch doors. For a Grade 1 keyed knob on a conventional cylinder rather than an IC core, the Corbin Russwin CK4851 covers 1-3/8 to 2 inch doors.
14) How secure is a BEST 8K knob against someone attacking the knob itself?
Several things work against a pull or wrench attack. The keyed knob only comes off after the core is removed, so nobody strips it without the control key. The inside rose snaps on with no exposed screws, and there is no keeper hole on the keyed knob. A breakaway option is available too, which lets the knob give way rather than let someone overpower the chassis with a pipe wrench. Worth specifying on ground floor and public corridor openings.
15) When would I need the 5 inch backset version of the BEST 8K instead of the standard?
The 5 inch backset pushes the knob further from the door edge, which you need when a wide stile, a glass lite, or a rail puts the standard position too close to something. Standard commercial prep is the 2-3/4 inch backset and that is what the vast majority of hollow metal and wood doors are bored for. Measure from the door edge to the center of the existing bore before you order; if it reads 2-3/4 inches, take the standard.
16) What Grade 2 passage knob matches a BEST 8K on a 2 inch thick door?
On thickness, the Corbin Russwin CK4410 passage/closet cylindrical lock is Grade 2 with a Global knob but stops at 1-3/4 inch, as do the Arrow MK01 and Arrow RK01 passage knobs at 1-3/8 inch to 1-3/4 inch. The BEST 8K adjusts to 2 inch and offers a 3-3/8 inch concave thick door rose. For a passage function that reaches a 2 inch door, the Grade 1 Corbin Russwin CK4310 at 1-3/8 inch to 2 inch is the one that carries the range.
17) Is a Grade 2 knob lock like the Sargent 6G04 an acceptable substitute for a BEST 8K on a dormitory corridor door?
They are built to different levels. The Sargent 6G04 is a Grade 2 standard duty single cylinder knob lock in the 6 Line Series with a storeroom function. The BEST 8K Series is Grade 1 and heavy duty with a corridor/dormitory function. On a high traffic corridor the grade and duty difference is the deciding factor, and the function differs as well - storeroom versus dormitory changes how the door behaves for the occupant, not just how long the lock lasts.
18) Can a Kwikset or Schlage Residential knob be used in place of a BEST 8K on an apartment corridor door?
They are built for a different service level. The Kwikset 400P-CP keyed entry knob is Grade 3 with a 1-3/8 inch to 1-3/4 inch door thickness range, 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 Series is a Grade 1 heavy duty commercial knob lock with a corridor/dormitory function. Unit entry doors inside a multi-family building are where the residential product tends to land; the shared corridor side is where the Grade 1 commercial lock is normally specified.
19) What looks like a BEST 8K knob lock but will not lock a door?
Dummy and trim-only knobs share the appearance and none of the mechanism. The Schlage A170 single dummy trim is a Grade 2 non-keyed dummy with no latch action, the Cal-Royal BA40 is a dummy knob in the Barrington BA Series, and the Sargent 78-2875 is an outside knob only with B design. The Emtek Arts and Crafts hammered egg knobset and the Georgetown crystal knobset are also dummy pairs. The BEST 8K Series is a keyed single cylinder lock with a 9/16 inch throw deadlocking latch - if the opening needs to latch or lock, a dummy trim is not the part.
20) Is there a fire rated knob lock alternative to the BEST 8K Series?
Two peers carry a fire rating in their specs. The Falcon X101 is a Grade 1 heavy duty passage knobset with an interchangeable core, fire rated, for 1-3/8 inch to 2-1/4 inch doors. The Falcon W101 is a Grade 2 medium duty passage/closet latch function with a 2-3/4 inch backset, also fire rated. Both are passage function rather than keyed, so on a rated opening that also needs to lock they cover the non-keyed leaf while the keyed door stays on a keyed lockset.
21) Does a keyless combination knob lock replace a BEST 8K on a dormitory door?
It answers a different need. The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function for 1 3/16 inch to 2 inch doors - no key, no cylinder, code entry instead. The BEST 8K Series is keyed, single cylinder, with a 7-pin housing that accepts all BEST cores. Where a facility is already keyed on BEST cores, dropping in a combination lock takes that door off the master key system.
22) Which entrance function knob locks compare to the BEST 8K for an office door?
On the Grade 1 side, the Corbin Russwin CK4851 is an entrance/office cylindrical lock with a Global knob and a conventional cylinder covering 1-3/8 inch to 2 inch doors. Stepping down in grade, the Callan Edgewood and Callan Roland are Grade 2 entrance knobsets, and the Pamex FTF Baron is a Grade 3 entrance/office knob lockset. The BEST 8K takes a BEST interchangeable core rather than a conventional cylinder, which is the difference that matters if the building rekeys by swapping cores.
23) Is knob trim for an exit device the same thing as a BEST 8K 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 Imperial USA ED-BKL580 is knob trim in a storeroom function for the ED-500 Series - both mount to an exit device and have no chassis or latch of their own. The BEST 8K Series is a complete cylindrical lock with a 2 1/16 inch chassis for a 2 1/8 inch bore and its own deadlocking latch. Trim is ordered against the exit device model, not against a bored door prep.
24) Which BEST 8K rose should I pick to cover the old holes on a retrofit?
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 3-3/8 inch sizes cover more of the door face, which is what you want when you are replacing an older lockset and the previous trim left marks or oversized prep around the 2-1/8 inch bore. Take the 2-9/16 inch concave when you want the smaller footprint and the door face is clean.
25) Is there a BEST 8K knob finish suitable for a hospital or clinic door?
626AM satin chrome antimicrobial is the one to specify for patient care areas, exam rooms, and food service corridors, where the knob is a high touch surface. It sits in the same finish range as the ten offered, alongside 626 satin chrome, 619 satin nickel and 690 statuary dark bronze, so you can carry it on the clinical wing and match the rest of the facility elsewhere.
26) Can I standardize a whole building on the BEST 8K, including passage and closet doors?
Partly. The 8K in dormitory function is the keyed corridor lock, so it covers the entry doors. Interior openings that need no key are a different function, and for a Grade 1 non-keyed knob in the same heavy duty class the Schlage D10S passage latch or the Corbin Russwin CK4310, which fits 1-3/8 to 2 inch doors, are the ones to pair with it. Keeping the backset at 2-3/4 inches across the job means one door prep everywhere.
27) What is a simpler knob lock for a bathroom or bedroom door in the same building as BEST 8K corridor locks?
Privacy function is the part for those doors, and it is not keyed. The Dexter C2000 privacy cylindrical ball knob lock is Grade 2 non-keyed for 1-3/8 inch to 1-3/4 inch doors, the Cal-Royal BER20 is a Grade 3 privacy knob lock with brass trim for the same thickness range, and the Pamex FTF Baron is a Grade 3 privacy knob lockset. The BEST 8K is a keyed single cylinder lock, which is more than a bath door needs.
28) Will a decorative brass knob set work where a BEST 8K is specified?
They serve different openings. The Deltana 6171 Round Knob entry and the Deltana 3381 Egg Knob entry both cover 1-3/8 inch to 2 inch doors, and the Omnia 434/PA is a traditional egg-shaped knob latchset in solid brass with a 3 inch projection. The BEST 8K is a Grade 1 heavy duty commercial lock offered in round and tulip knob styles with concave and convex roses. On a public corridor in a school, hospital or office the specification usually turns on grade and duty, which the decorative sets do not state.
How fast can I get the BEST 8K37T4ASTK626 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 8K37T4ASTK626 come with a warranty?
Absolutely. The BEST 8K37T4ASTK626 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 8K37T4ASTK626?
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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