BEST 8K Series Hotel Function ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,139.00
$632.78
BEST BEST 8K Series - Hotel Function (H) Single Cylinder Grade 1 Heavy Duty Knob Lock, SFIC Less Core BEST-8K-H

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

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Model: 8K37H4ASTK626
$1,139.00
$632.78
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,139.00
$632.78
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BEST 8K Series Hotel Function Single Cylinder Grade 1 Heavy Duty Knob Lock

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

The BEST 8K Series Hotel Function Single Cylinder Grade 1 Heavy Duty Knob Lock delivers dependable security for high-traffic commercial environments. Featuring knobs machined from solid brass or bronze bar stock with a 2 1/8" diameter and 2 7/8" projection, this Grade 1 cylindrical lock exceeds ANSI requirements for security and reliability. The 9/16" throw deadlocking latch provides secure engagement, while the 2 1/16" diameter chassis fits standard 2 1/8" door preparations with adjustable door thickness from 1 3/8" to 2".

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 proven performance in high-traffic environments.
  • Secure Latch Design: 9/16" throw deadlocking latch with 2 1/4" x 1 1/8" beveled front provides reliable engagement and security.
  • 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.
  • Enhanced Security Features: Keyed knob removable only after core removal, snap-on inside rose with no exposed screws, and no keeper hole design for added protection.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis for wear-resistant, reliable performance.
  • Quick Rekeying: BEST interchangeable core system allows economical rekeying without lock replacement.
  • Vandal Resistance: Optional breakaway feature prevents lockset from being overpowered by wrenches or tools.

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: Faculty/Hotel/Restroom
  • 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 2 1/8" bore for lock housing, 1" hole for latch tube, and door thickness compatibility from 1 3/8" to 2".
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper chassis and latch installation.
  3. Prepare door by drilling required 2 1/8" diameter bore and 1" latch hole, ensuring proper alignment and door edge preparation.
  4. Install chassis, latch assembly, and trim components according to manufacturer torque specifications, ensuring proper rose threading and secure mounting.
  5. Adjust knob operation for smooth function, verify deadlocking latch engagement, and test rotating knob face for proper hand-of-door operation.
  6. Test lock operation with key and verify proper latch throw, knob function, and security features. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Hotel and Hospitality Guest Rooms
  • Commercial Office Buildings
  • Educational Facility Classrooms
  • Healthcare Institution Patient Rooms
  • Government and Military Facilities
  • Multi-Tenant Residential Properties
  • Industrial and Warehouse Administrative Areas

Why Choose BEST Quality?

BEST 8K Series knob locks deliver professional-grade reliability with solid brass or bronze construction and Grade 1 performance that exceeds ANSI requirements. Internal components feature corrosion-resistant treatment and steel retractors with low friction bearings for long-term durability in demanding commercial applications. Engineered for heavy-duty use where dependable security and smooth operation are essential.

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:
Faculty/Hotel/Restroom
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K37H4ASTK626 – Frequently Asked Questions

1) Will the BEST 8K knob lock fit a 2-1/8 inch bore, and what door thickness does it cover?
The 8K chassis is 2-1/16 inches in diameter, so it drops into a standard 2-1/8 inch cross bore with a 1 inch hole for the latch tube. Standard trim adjusts for doors 1-3/8 to 2 inches thick. Thicker doors are not out of reach: special E trim covers 2-1/8 to 3 inch doors, and one of the rose choices is a 3-3/8 inch concave thick-door rose.
2) What does hotel function mean on a BEST 8K knob lock, and where should I use it?
Hotel function on the 8K is the faculty/hotel/restroom function: a keyed single cylinder outside knob with the shutout behavior that lets an occupant lock out ordinary keys while a designated key still gets in. It is the function specified for guest rooms, faculty offices, patient rooms and restrooms where the room occupant controls entry but the building keeps override. If you want a straight lock-it-from-the-outside storeroom function instead, that is a different function code, not this one.
3) Does the BEST 8K knob lock take a small format interchangeable core, and does a core come with it?
The 8K uses a 7-pin housing that accepts all BEST cores, and it ships less core, so you supply or order the SFIC core and key it into your existing system. That is the point of the design for a multi-building keyway: rekeying is a core swap, not a lock replacement. The keyed knob can only be pulled after the core is removed, so nobody walks off with the outside knob.
4) Which backset do I order for a BEST 8K knob lock, 2-3/4 or 5 inch?
Two backsets are built: 2-3/4 inch, which is the standard commercial backset and what most hollow metal and wood commercial doors are bored for, and 5 inch for wide stile applications where the bore sits further off the door edge. Measure from the door edge to the center of the 2-1/8 inch bore before ordering. The wrong backset will not reach the latch prep.
5) What is the closest Grade 1 heavy duty cylindrical knob lock to the BEST 8K if a different brand is specified?
The Sargent 8XG04 is a Grade 1 heavy duty single cylinder knob lock in the 8X Line Series with a 2-3/4 inch backset, which matches the BEST 8K on grade, duty level, keyed single cylinder operation and the standard 2-3/4 inch backset. The functional difference is the lock function: the 8XG04 is a storeroom/closet lock, where the 8K covered here is a Faculty/Hotel/Restroom function. Storeroom keeps the outside knob locked at all times, so it is a match for the 8K only where the opening does not need the hotel function behavior.
6) Which knob lock takes an interchangeable core like the BEST 8K does?
The Falcon X101 is a heavy duty Grade 1 cylindrical knobset with an interchangeable core, in the X Series, fire rated, with a door thickness range of 1-3/8 to 2-1/4 inches. The BEST 8K uses a 7-pin housing that accepts all BEST cores and ships less SFIC core. The X101 is a passage function, so it is non-keyed in operation; a facility keying its cylinders on a small-format core program should confirm which core format each chassis is prepped for before mixing the two.
7) What should be used on a classroom door instead of a hotel function knob lock?
The Dexter C2000 Series classroom knob lock is a Grade 2 keyed cylindrical ball knob lock, non-clutching, for doors 1-3/8 to 1-3/4 inches thick. Classroom function is keyed from the outside and always free from the inside, which is the behavior a teaching space normally requires. The BEST 8K covered here is a Faculty/Hotel/Restroom function, a different keying behavior, so a classroom opening should be specified as a classroom lock rather than substituted with this one.
8) Is a residential keyed entry knob a substitute for the BEST 8K in an apartment building?
The Kwikset 400P-CP Polo keyed entry knob is a Grade 3 entrance lock for doors 1-3/8 to 1-3/4 inches with a round corner adjustable latch and round corner strike, and the Master Lock BC01 is a Grade 3 keyed entry knob in the BC Series. Both are keyed like the BEST 8K, but the 8K is a Grade 1 commercial heavy duty chassis with knobs machined from solid brass or bronze bar stock and steel reinforced roses, and it is offered with an ANSI strike as well as a standard strike. Where a specification calls out ANSI Grade 1 or an ANSI strike prep, a Grade 3 residential knob does not meet it.
9) What knob lock works on a thicker door than a standard commercial knobset covers?
The BEST 8K adjusts for 1-3/8 to 2 inch doors as standard, with special E trim available for 2-1/8 to 3 inch doors, and a 3-3/8 inch concave thick door rose is offered. Among comparable chassis, the Falcon X101 covers 1-3/8 to 2-1/4 inches and the Corbin Russwin CK4310 covers 1-3/8 to 2 inches, while Grade 2 and Grade 3 knobsets such as the Dexter C2000 entry and the Pamex FTF Baron stop at 1-3/4 inches. On a thick door, confirm the range before ordering.
10) What knob lock covers a 5 inch backset opening?
The BEST 8K is offered in a 2-3/4 inch standard backset and a 5 inch backset. Comparable knobsets state narrower backset choices: the Falcon W101 is a 2-3/4 inch backset, the Sargent 8XG04 is a 2-3/4 inch backset, and the Baldwin Estate 5000 Baltimore knob passage lock is a 2-3/8 inch backset with a full lip strike. Where the existing bore sits 5 inches from the door edge, the backset has to be matched before anything else about the lock is considered.
11) Do I have to worry about handing when ordering a BEST 8K knob lock?
No. The 8K is non-handed, so one lock covers left and right hand openings and you can stock a single part number across a building. The knob face rotates to suit the hand of the door during install.
12) How do I match a BEST 8K knob lock to the knobs and roses already on my other doors?
Knob shape and rose are both selectable. Knobs come round or tulip, and roses come as 2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch concave thick-door, or 3-3/8 inch convex. Pick the larger 3-3/8 inch rose when you are covering an old prep or a scarred door face, and the 2-9/16 inch when the existing trim is small. Ten finishes are built, from 605 bright brass through 626 satin chrome and 690 statuary dark bronze, including 626AM satin chrome antimicrobial for healthcare.
13) Is a Grade 1 knob lock worth it over a Grade 2 or 3 for a high traffic door?
On doors that cycle all day, Grade 1 is the ANSI tier for heavy duty commercial use and it is what the 8K is built to, with knobs machined from solid brass or bronze bar stock and steel reinforced roses. Most knob locks in this category sit lower: the Dexter C2000 keyed knobs and Corbin Russwin CK4410 are Grade 2, and Cal-Royal BER00 and Pamex FTF are Grade 3. Those are fine for interior and light commercial doors, but for a guest room or classroom corridor door the Grade 1 chassis is the one that survives the cycle count.
14) What else could I buy instead of the BEST 8K if I do not want a BEST keyway?
Two Grade 1 heavy duty cylindrical knob locks sit alongside it. The Sargent 8XG04 is a Grade 1 heavy duty single cylinder knob lock with a 2-3/4 inch backset in storeroom function, and the Falcon X101 is a Grade 1 heavy duty knobset with an interchangeable core and a 1-3/8 to 2-1/4 inch door thickness range, though the X101 is passage, not keyed. Corbin Russwin CK4851 is a keyed entrance/office knob lock covering 1-3/8 to 2 inch doors. None of them is hotel function, so if the occupant shutout behavior is what you need, stay with the 8K.
15) Is a Grade 2 knob lock enough instead of the BEST 8K on an interior office door?
For a lower traffic interior opening, the Sargent 6G04 is a Grade 2 standard duty storeroom/closet knob lock with a single cylinder in the 6 Line Series, and the Corbin Russwin CK4851 is an entrance/office cylindrical knob lock with a conventional cylinder rated for doors 1-3/8 to 2 inches thick. The BEST 8K is Grade 1 heavy duty and adjusts for doors 1-3/8 to 2 inches standard. Grade 2 chassis are built to a lower ANSI cycle and strength requirement than Grade 1, so the choice comes down to expected traffic and whether the facility standardizes on one grade.
16) What is the right choice for a restroom or bedroom door that only needs to lock from inside?
A privacy lock covers that opening: the Dexter C2000 Series privacy knob lock is a Grade 2 non-keyed cylindrical ball knob for doors 1-3/8 to 1-3/4 inches, and the Cal-Royal BER20 is a Grade 3 privacy knob lock with brass trim for the same door thickness range. The BEST 8K is a keyed single cylinder lock, so it is specified where a key is part of how the door is controlled rather than where a simple inside-only lock is all that is needed.
17) Can a Schlage D Series knob lock replace the BEST 8K on a heavy traffic opening?
The Schlage D10S is a Grade 1 heavy duty cylindrical knob lock in the D Series with an Orbit knob, matching the BEST 8K on grade and duty level. The D10S is a passage latch and non-keyed, meaning it latches the door but never locks. The 8K is a keyed single cylinder lock, so the D10S is a same-grade chassis for the opening only where no key control is wanted.
18) Which knob locks look like the BEST 8K but will not secure a door at all?
Dummy trim is the common mistake. The Schlage A170 single dummy trim is a Grade 2 non-keyed knob for doors 1-3/8 to 1-7/8 inches, the Cal-Royal BA40 is a dummy knob for 1-3/8 to 1-3/4 inch doors, and the Emtek Arts and Crafts Hammered Egg knobset is sold as a dummy pair. None of these have a latch or a cylinder; they mount as a pull. The BEST 8K is a keyed single cylinder chassis with a 9/16 inch throw deadlocking latch, so it is what goes on an opening that has to actually latch and lock.
19) Which knob lock is fire rated for a labeled door opening?
Among comparable cylindrical knobsets, the Falcon X101 heavy duty Grade 1 knobset and the Falcon W101 Grade 2 medium duty passage knob lock with a 2-3/4 inch backset both carry a fire rating. The BEST 8K is a Grade 1 heavy duty chassis with a 9/16 inch throw deadlocking latch and a 2-1/4 by 1-1/8 inch beveled front. On a labeled opening, match the lock to the door label and confirm the listing on the specific part being ordered.
20) Is a keyless combination knob lock an alternative to a keyed commercial knobset?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function for doors 1-3/16 to 2 inches thick. It removes keys from the opening entirely, which suits a door where issuing keys is the problem. The BEST 8K is a keyed single cylinder lock with a 7-pin housing that accepts all BEST cores, so it belongs on a door that is part of an existing key system and needs to be rekeyed by swapping the core.
21) What is the difference between the BEST 8K and knob trim sold for an exit device?
The Sargent 28C-KNOB is exit device trim with a knob and rose in the 28 Series for 1-3/4 inch doors, and the Imperial USA ED-BKL580 is storeroom function knob trim in the ED-500 Series. Both are outside trim that mounts to an exit device and has no chassis or latch of its own. The BEST 8K is a complete cylindrical lockset with a 2-1/16 inch diameter chassis that fits a standard 2-1/8 inch bore, so it is the choice for a bored door, not for a door already carrying a panic device.
22) Which comparable knob lock is non-handed like the BEST 8K?
The BEST 8K is non-handed, so one part number covers both left and right hand doors and the rotating knob face is adjusted for hand of door during install. Among comparable heavy duty chassis, the Corbin Russwin CK4310 Grade 1 passage cylindrical lock with a Global knob covers 1-3/8 to 2 inch doors, and the Schlage D10S is a Grade 1 heavy duty cylindrical knob lock. For fleet ordering, a non-handed lock removes the need to survey handing across every opening before placing the order.
23) How much clearance do BEST 8K knobs need off the door face?
The knobs are 2-1/8 inches in diameter with a 2-7/8 inch projection from the door face. Check that against anything mounted close to the opening, a return wall, an adjacent door in a pair, or a push plate, before you commit to a knob rather than a lever.
24) Can I use the BEST 8K on doors where people grab the lock with a wrench?
There is an optional breakaway feature for exactly that. It keeps the lockset from being overpowered by a wrench or pry tool, which is worth specifying on doors in dorms, transit areas, or anywhere unsupervised after hours. The inside rose also snaps on with no exposed screws and there is no keeper hole, so there is less to attack from the secure side.
25) Is there a BEST 8K knob lock finish suitable for a healthcare facility?
626AM, satin chrome with an antimicrobial coating, is one of the ten finishes built for the 8K. It is the one specified for patient rooms, exam rooms and food service areas where a touched surface matters. Plain 626 satin chrome is the same appearance without the coating.
26) Which knobsets suit a decorative residential opening rather than a commercial one?
For a residential or decorative door, the Deltana 6171 Round Knob entry and Deltana 3381 Egg Knob entry both cover 1-3/8 to 2 inch doors, the Baldwin Estate 5011 Colonial passage knob uses a 5058 rose, and the Emtek Porcelain knobs ship as two knobs per set with a threaded rod. The BEST 8K is a commercial chassis with a knob 2-1/8 inches in diameter and 2-7/8 inches in projection, offered in round or tulip knob styles and finishes including 626 satin chrome and 690 statuary dark bronze. The two groups answer different design intents on the door.
How fast can I get the BEST 8K37H4ASTK626 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 8K37H4ASTK626 come with a warranty?
Absolutely. The BEST 8K37H4ASTK626 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 8K37H4ASTK626?
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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