BEST 8K Series Service Station...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,043.00
$602.62
BEST BEST 8K Series - Service Station Function (E) Single Cylinder Grade 1 Heavy Duty Knob Lock, SFIC Less Core BEST-8K-E

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

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Model: 8K37E4ASTK626
$1,043.00
$602.62
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,043.00
$602.62
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BEST 8K Series Service Station 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 in high traffic commercial environments with knobs machined from solid brass or bronze bar stock. This Grade 1 heavy-duty cylindrical knob lock features a 9/16" throw deadlocking latch, 2 1/16" diameter chassis for 2 1/8" door bore, and adjustable door thickness from 1 3/8" to 2" standard. Exceeds ANSI Grade 1 requirements for security and reliability with corrosion-resistant internal components designed for long-term performance.

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 Security Performance: Exceeds ANSI Grade 1 requirements with 9/16" throw deadlocking latch and enhanced security features including core removal requirement before knob removal.
  • Flexible Door Compatibility: 2 1/16" diameter chassis fits standard 2 1/8" door bore with adjustable thickness from 1 3/8" to 2" standard, special E trim available for 2 1/8" to 3" doors.
  • Quick Economical Rekeying: BEST interchangeable core system allows rapid rekeying without lock removal for efficient key management.
  • 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 protection.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis provide wear-resistant, reliable operation throughout the lock's service life.
  • Vandal-Resistant Options: Optional breakaway feature prevents lockset from being overpowered by wrench attacks, rotating knob face allows hand changes without knob removal.
  • Corrosion Protection: Internal components treated for corrosion resistance with brass or corrosion-treated steel construction for extended product life.

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: Service Station
  • 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" standard, 2 1/8" bore diameter, and 1" edge bore for latch housing.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for proper chassis and latch alignment.
  3. Prepare door by drilling required 2 1/8" bore hole and 1" edge hole, ensuring proper door thickness compatibility with standard or special E trim options.
  4. Install chassis, latch assembly, and strike hardware securing all components per manufacturer torque specifications with provided mounting screws.
  5. Adjust knob projection (2 7/8" standard), rose configuration, and operational components for proper alignment, latching, and smooth operation throughout full range of motion.
  6. Test device operation including key function, latch engagement, and deadlocking mechanism to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

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 are treated for corrosion resistance and designed with steel retractors and low friction bearings for long-term durability in demanding commercial applications. Engineered for heavy-duty performance 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:
Service Station
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K37E4ASTK626 – Frequently Asked Questions

1) What does the BEST 8K service station function actually do at the door?
Service station is a keyed single cylinder knob function on the 8K Series: it is a commercial bored lockset built around BEST's interchangeable core, so the key controls the outside knob and the core can be pulled and rekeyed without taking the lock off the door. Note that the keyed knob only comes off after the core is removed, which is a security feature but also means a locksmith needs a control key in hand before any teardown. The chassis is non-handed, so one lock works on a left or right hand opening with no field conversion.
2) Will a BEST 8K knob lock fit my existing 2-1/8 inch door prep?
Yes. The 8K chassis is 2-1/16 inches in diameter and drops into the standard 2-1/8 inch cross bore, with a 1 inch edge bore for the latch housing. That is the same prep almost every commercial cylindrical lockset uses, so an 8K goes into a door already bored for another bored lock without new holes, provided the backset matches.
3) What door thickness will the 8K Series knob lock handle, and what do I order for a thick door?
Standard 8K trim adjusts from 1-3/8 to 2 inches, which covers 1-3/4 inch commercial doors and older 1-3/8 inch interior doors without any special parts. For doors from 2-1/8 up to 3 inches, the special E trim is required. There is also a thick door rose option, the 3-3/8 inch concave thick door rose, that goes with those heavier doors.
4) Which backset do I need on a BEST 8K knob lock, and does it work on a wide stile aluminum door?
Two backsets are offered: 2-3/4 inch, which is the standard on commercial hollow metal and wood doors, and 5 inch for wide stile openings where the bore sits farther from the door edge. Measure from the door edge to the center of the existing 2-1/8 inch bore before ordering; a 5 inch backset lock will not reach the latch prep on a 2-3/4 inch door and vice versa.
5) Will the 8K latch drop into the strike I already have in the frame?
The 8K uses a 9/16 inch throw deadlocking latch. If the existing frame has a standard cylindrical lock strike with the usual lip and box, the latch will engage it. Two strikes are offered with the lock, a standard strike and an ANSI strike, so if the frame is prepped for the larger ANSI 4-7/8 inch cutout, order the ANSI strike rather than trying to fill or shim the opening.
6) Does the BEST 8K come with a core, or do I have to buy the cylinder separately?
It ships less core. The 8K carries a 7-pin housing that accepts all BEST small format interchangeable cores, so you add a core keyed to your existing system, or a construction core while the job is in progress. If a facility already runs BEST SFIC, this lock joins that keying system with no new keyway to manage.
7) What is the closest Grade 1 heavy duty knob lock to the BEST 8K if I need an interchangeable core?
The Falcon X101 is a Grade 1 heavy duty cylindrical knobset with an interchangeable core, covering doors from 1-3/8 inch to 2-1/4 inch and carrying a fire rating. The BEST 8K Series is also Grade 1 heavy duty and uses a 7-pin housing that accepts all BEST cores, supplied less SFIC core. The functional difference to settle before ordering: the X101 is a passage function with no key control at the knob, while the 8K is keyed single cylinder in service station function. If your key system is already BEST small format, the 8K keeps the core interchange you have; if you only need a latch that always retracts, the X101 is the passage equivalent.
8) Sargent 8XG04 or BEST 8K for a keyed knob on a heavy traffic commercial door?
Both are Grade 1 heavy duty single cylinder knob locks. The Sargent 8XG04 is a storeroom/closet function in the 8X Line Series with a 2-3/4 inch backset. The BEST 8K Series is a service station function and offers a 2-3/4 inch standard backset as well as a 5 inch backset for wide stile or narrow-frame conditions. Two things decide it: the function you need at the opening, since storeroom and service station behave differently on the inside knob, and whether the door needs the longer backset, which the 8K covers and the 8XG04 is listed at 2-3/4 inch only.
9) Is the Sargent 6G04 an acceptable substitute for a BEST 8K knob lock?
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 Series is Grade 1 heavy duty. If the specification on the drawing calls for Grade 1, the 6G04 does not meet it. Where the opening is an interior storage or closet door in a lower traffic area and the spec allows Grade 2, the 6G04 covers the same keyed storeroom behavior in a lighter chassis. For government, healthcare and education work where Grade 1 is typically written into the hardware schedule, stay with the 8K.
10) Corbin Russwin CK4851 versus the BEST 8K for a keyed office door?
The Corbin Russwin CK4851 is a Grade 1 entrance/office cylindrical knob lock with a Global knob and a conventional cylinder, fitting doors 1-3/8 inch to 2 inch. The BEST 8K Series is Grade 1 service station function with a 7-pin housing that accepts all BEST cores. The deciding difference is the cylinder platform and the function: the CK4851 takes a conventional cylinder and gives the entrance/office behavior where the inside can lock the outside knob, while the 8K is built around BEST interchangeable core rekeying and runs the service station function. Match to whatever key system the building already runs.
11) Which knob lock should I use for a classroom door instead of a service station function?
Service station function is not classroom function. The Dexter C2000 Series classroom cylindrical ball knob lock is a Grade 2 keyed classroom function for doors 1-3/8 inch to 1-3/4 inch, and the Sargent 28C-KNOB is a classroom function knob and rose trim for exit devices on 1-3/4 inch doors. The BEST 8K Series covered here is service station function. On a classroom opening where the teacher must lock and unlock the outside knob by key, specify the classroom function product, not the service station 8K.
12) What Grade 2 knob lock comes closest to the BEST 8K on door thickness range?
Among the Grade 2 knob locks, the Corbin Russwin CK4410 passage/closet cylindrical lock covers 1-3/8 inch to 1-3/4 inch, and the Dexter C2000 entry/office keyed knob is the same 1-3/8 inch to 1-3/4 inch. The BEST 8K Series runs 1-3/8 inch to 2 inch standard, with special E trim taking it out to 2-1/8 inch to 3 inch. On a thick door, a solid core slab, or a door with an added fire-rated face, the Grade 2 units above stop at 1-3/4 inch while the 8K keeps going.
13) Is a Grade 1 knob lock like the BEST 8K worth it over a Grade 2 for a school or office corridor?
For high traffic openings, yes. The 8K is Grade 1 heavy duty with knobs machined from solid brass or bronze bar stock, steel reinforced roses, a steel retractor on low friction bearings, and internal parts treated for corrosion. Grade 2 locks are built for lighter cycle counts. Among knob locks we carry, a Grade 2 alternative would be something like the Corbin Russwin CK4410 or the Sargent 6G04; a Grade 1 peer closer to the 8K is the Sargent 8XG04 or the Falcon X101.
14) What is a comparable Grade 1 knob lock with an interchangeable core if I do not run BEST keying?
The Falcon X101 is a heavy duty Grade 1 cylindrical knobset with an interchangeable core, listed for 1-3/8 to 2-1/4 inch doors, so it covers a slightly wider thickness range than the 8K's standard 1-3/8 to 2 inch trim. The Sargent 8XG04 is another Grade 1 heavy duty knob lock, single cylinder, with a 2-3/4 inch backset. Both are worth looking at if the building's key system is not BEST SFIC; if it is, the 8K stays in that system.
15) I need to match the knobs and finishes across a whole building. What does the 8K offer?
Ten finishes and two knob shapes. Finishes run 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. Knobs come 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 if the existing doors have a large rose covering old paint or wear rings, the 3-3/8 inch options hide it where a 2-9/16 inch rose would not.
16) Is there an antimicrobial version of the BEST 8K knob for a hospital or clinic?
Yes, 626AM satin chrome antimicrobial is one of the finish choices on the 8K. It is the same Grade 1 heavy duty knob lock, ordered in the AM finish instead of plain 626 satin chrome, which matters on patient room and corridor doors where touched hardware is part of the infection control spec.
17) How do I stop tenants and vandals from wrenching a knob lock off the door?
The 8K has an optional breakaway feature that keeps the lockset from being overpowered by a wrench attack, and the inside rose snaps on with no exposed screws. Keyed knobs have no keeper hole, and the knob cannot be pulled until the core comes out. Specify the breakaway option when ordering if the opening is exposed, such as an exterior stairwell or a street facing utility door.
18) Should I use a knob lock or a lever for an accessible opening?
The 8K is a knob lockset, and knobs require grasping and twisting. Where an opening has to be operable without tight grasping or wrist twisting, a lever trim is the usual answer, not a knob. Use the 8K on service, storage, mechanical, and back of house doors where a knob is acceptable, and spec a lever lockset on public accessible routes.
19) What Grade 1 knob should I use on the doors that only need to push and pull, not lock?
For openings in the same run that take no key, the Schlage D10S is a Grade 1 heavy duty passage latch with an Orbit knob, and the Corbin Russwin CK4310 is a Grade 1 passage/closet cylindrical lock with a Global knob covering 1-3/8 inch to 2 inch doors. Both hold the Grade 1 level while the BEST 8K, which is keyed single cylinder, handles the openings that need key control. Specifying the passage units alongside the keyed 8K keeps one grade across the corridor without paying for cylinders on doors that never take a key.
20) Can I use a Kwikset 400P or Master Lock BC01 keyed knob instead of a commercial Grade 1 knob lock?
The Kwikset 400P-CP keyed entry knob is Grade 3 and fits doors 1-3/8 inch to 1-3/4 inch; the Master Lock BC01 keyed entry knob in the BC Series is also Grade 3. The BEST 8K Series is Grade 1 heavy duty and is built for commercial use with door thickness from 1-3/8 inch to 2 inch standard. On an apartment interior or a light-use door the Grade 3 knobs do the job. On a corridor, storeroom, or any door in a facility hardware schedule that specifies Grade 1, they are not a substitute for the 8K.
21) What is the difference between the BEST 8K and the Falcon W101 for a commercial interior door?
The Falcon W101 is a Grade 2 medium duty cylindrical knob lock in the W Series, passage/closet latch function with a 2-3/4 inch backset and a fire rating. The BEST 8K Series is Grade 1 heavy duty, keyed single cylinder, and shares the 2-3/4 inch standard backset. Two distinct choices: the W101 gives a non-keyed latch at medium duty for hall and closet doors, the 8K gives keyed control at heavy duty. If the door needs a key, the W101 does not answer the requirement regardless of grade.
22) I need a knob for a restroom or bedroom door on the same job as the BEST 8K. What do I order?
A keyed single cylinder knob lock is the wrong device for a bathroom or bedroom, which needs privacy function. The Dexter C2000 Series privacy ball knob lock is Grade 2 for doors 1-3/8 inch to 1-3/4 inch, the Cal-Royal BER20 is a Grade 3 privacy knob lock with brass trim for the same thickness range, and the Pamex FTF privacy lockset is Grade 3. The BEST 8K Series is service station function and keyed, so it belongs on the corridor and storage doors while the privacy sets handle the occupied rooms.
23) Will a Schlage A170 or an Emtek dummy knob work where I need a BEST 8K?
No. The Schlage A170 is single dummy trim, a Grade 2 non-keyed knob in the A Series, and the Emtek Arts and Crafts hammered egg and Cal-Royal BA40 knobs are dummy function as well. A dummy knob has no latch and no cylinder at all, so it does nothing but give a hand hold on an inactive leaf. The BEST 8K Series is a keyed single cylinder lock with a 9/16 inch throw deadlocking latch. Dummy trim is only a match for the 8K visually, never functionally.
24) Is there a keyless option instead of the BEST 8K for a door where I do not want to issue keys?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function, fitting doors 1 3/16 inch to 2 inch. It replaces key distribution with a code at the door. The BEST 8K Series takes the opposite approach: a 7-pin housing accepting all BEST cores, so rekeying is done by pulling and swapping the core rather than changing a combination. For a shared utility or gate-side door where issuing keys is the problem, the 3830 answers it; where the door belongs to an existing BEST master key system, breaking it out to a combination lock removes it from that system.
25) For a healthcare facility, is there an antimicrobial knob option comparable to standard commercial knob locks?
The BEST 8K Series offers a 626AM satin chrome antimicrobial finish alongside the standard 626 satin chrome, on a Grade 1 heavy duty chassis. Among the commercial knob locks in the same class, the Sargent 8XG04 Grade 1 storeroom and the Corbin Russwin CK4851 Grade 1 entrance/office are specified by grade and function rather than by an antimicrobial finish option. For patient room corridors and clinical areas where the infection control standard drives the hardware selection, the 626AM finish on the 8K is the one that speaks to it directly.
26) I have an exit device on the door. Do I order the BEST 8K for the outside trim?
No. A cylindrical knob lock and exit device trim are different parts. For a device you want the Sargent 28C-KNOB, a knob and rose exit device trim in classroom function for 1-3/4 inch doors, the Sargent 78-2875 outside knob only in the 7800 Series, or the Imperial USA ED-BKL580 knob trim in storeroom function from the ED-500 Series. The BEST 8K Series is a complete cylindrical lockset with its own chassis and deadlocking latch, sized for a 2-1/8 inch bore and 1 inch edge bore. It has no way to drive a device's latch retraction.
27) What are the lower cost Grade 2 and Grade 3 keyed knob options if Grade 1 is more than my door needs?
Stepping down from the Grade 1 heavy duty BEST 8K, the Callan Edgewood is a Grade 2 entrance knobset and the Dexter C2000 entry/office is a Grade 2 keyed ball knob for 1-3/8 inch to 1-3/4 inch doors. Below that, the Cal-Royal BER00 is a Grade 3 entrance/office knob lock with a Kwikset keyway, and the Pamex FTF Baron is a Grade 3 entrance/office lockset, both for the same 1-3/8 inch to 1-3/4 inch range. The BER00's Kwikset keyway matters if the property is already keyed that way; the 8K keeps you in the BEST core system instead.
28) Can the knob orientation be changed after the lock is installed?
On the 8K, the rotating knob face allows hand changes without removing the knob, and the chassis itself is non-handed. So a door that gets re-hung swinging the other way does not need a new lock or a teardown.
29) Is the BEST 8K electronic or does it need any wiring?
Purely mechanical. The 8K knob lock has no electronics and no power requirement, so it keeps working when the building loses power and needs no wire prep in the door or frame. Access is controlled entirely by the BEST core and key system.
30) How far does a BEST 8K knob stick out from the door face?
Standard knob projection on the 8K is 2-7/8 inches. That matters where a door swings back against a wall or an adjacent frame, or where a jamb mounted device sits close to the knob, since the knob is the first thing to make contact.
31) Is a Baldwin, Deltana, or Omnia solid brass knob an alternative to the BEST 8K?
They are built for different work. The Deltana 6171 Round Knob entry and 3381 Egg Knob entry cover 1-3/8 inch to 2 inch doors, the Omnia 434/PA is a solid brass passage latchset, and the Baldwin Estate 5000 Baltimore knob comes preconfigured with a 2-3/8 inch backset and full lip strike. These are decorative solid brass sets for residential and hospitality interiors. The BEST 8K Series is Grade 1 heavy duty commercial with knobs machined from solid brass or bronze bar stock and steel-reinforced roses, on a 2-3/4 inch or 5 inch backset. Where the finish schedule is architectural, the decorative sets fit; where the door is in a corridor cycle count, the 8K is the chassis built for it.
How fast can I get the BEST 8K37E4ASTK626 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 8K37E4ASTK626 come with a warranty?
Absolutely. The BEST 8K37E4ASTK626 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 8K37E4ASTK626?
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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