BEST 8K Series - Corridor/Apar...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$971.00
$543.72
BEST BEST 8K Series - Corridor/Apartment Function (C) Double Cylinder Grade 1 Heavy Duty Knob Lock, SFIC Less Core BEST-8K-C

BEST 8K Series - Corridor/Apartment Function (C) Double Cylinder Grade 1 Heavy Duty Knob Lock, SFIC Less Core

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Model: 8K37C4ASTK626
$971.00
$543.72
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$971.00
$543.72
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BEST 8K GRADE 1 CYLINDRICAL KEYED KNOB LOCK

The premium knob set for heavy-duty applications.

BEST’s 8K lock series delivers dependable security in high traffic areas. With knobs machined from brass or bronze bar stock, you’ll feel the weight of BEST’s solid construction and high-quality performance. Designed for strength and durability, but also for easy installation and use, BEST 8K knob sets are the leading heavy-duty choice.

The 8K is a Grade 1 heavy-duty cylindrical knob set. BEST 8K locks are not only designed to last and protect, they’re also simple to install, retrofit, rekey, and use. Premium workmanship and carefully designed components ensure that 8K locks perform—easily but reliably—over the long-term.

  • High quality. External components are designed for premium aesthetics and security, while internal components are treated for corrosion resistance to ensure long product life.
  • Proven reliability. Exceeds ANSI Grade 1 requirements for security and reliability. Keyed knob design and strong retractor springs provide better functionality throughout the life of the lock.
  • Enhanced security. Cores must be removed before keyed knobs to deter break-in attempts, and a snap-on inside rose with no exposed screws helps to deter attack

The 8K is a commonly used lock for non-ADA compliant applications, such as governmentand military facilities (barrack doors, base housing, etc.) as well as countries that do not require ADA compliance, such as Latin America.

FEATURES & BENEFITS

  • Quick, economical rekeying with the BEST® interchangeable core.
  • Knobs machined from brass or bronze bar stock.*
  • Rotating knob face provides for easy hand of door change without removing the knob.
  • No keeper hole on keyed knobs for added security.
  • Keyed knob removable only after the core is removed.
  • The tactile or knurled knob feature designed for blind, safety and accessibility applications.
  • Friction insert inside rose resists loosening.
  • The optional breakaway feature prevents the lockset from being overpowered by a wrench.
  • 9/16" throw, deadlocking latch.
  • Spin free knob feature permits the lock to be operated only by use of a key.
  • Steel retractor with low friction bearings for smooth, wear resistant operation.
  • Long bearing length in chassis for smooth, wear resistant operation.

* All knob styles feature solid extruded knob material. Products covered by one or more of the following patents: 5,590,555 5,794,472

STANDARD SPECIFICATIONS

Materials: Internal parts are brass or corrosion-treated steel.

Chassis: 2 1/16" diameter to fit 2 1/8" hole in door.

Backset: 2 3/4" standard, 3 3/4" and 5" available.

Latch: 9/16" throw. Front 2 1/4 x 1 1/8" beveled. Latch housing fits 1" hole in edge of door.

Knobs: Diameter – 2 1/8"
            Projection from door– 2 7/8" #4, #6
            Knob Material – Machined from solid brass or bronze.

Roses: All roses are brass or bronze reinforced with steel liner. Roses are threaded to chassis.

A – round, 3 3/4" diameter;
C – round, 2 9/16" diameter;
D – convex round, 3 3/8" diameter
E – special trim for 2 1/8" to 3" thick doors

Door Thickness: Adjustable from 1 3/8" to 2” standard. Special “E” trim for 2 1/8" to 3” doors available. The “B” style square trim is for doors 1 3/4" to 2” only.

Strike: (STK) – 2 3/4" x 1 1/8" with curved lip and box standard (ANSI A115.3),

(S3) – 4 7⁄8" x 1 1/4" with curved lip and box available
(ANSI A115.2), (S3-7⁄8) – Conforms to ANSI A115.2 for 1 3⁄4” doors.(4 7⁄8” x 1 7⁄8” flat)
STK (standard) – 2 3/4" x 1 1/8" with curved lip & box. (ANSI A115.2 for 1 3/8" doors).
S3 – 4 7/8" x 1 1/4" with curved lip & box. (ANSI A115.2 for 1 3/4" doors).

Latch & Strike Screws: (STK) Strike Package

(1) 2 3⁄4" Strike plate,
(4) #8-32 / #8-16 x 3/4" Phillips flat head screws. 8KS3 Strike
(1) 4 7/8" Strike plate,
(2) #8-32 / #8-16 x 3/4" Phillips flat head screws,
(2) #12-24 / #12-12 x 3/4" Phillips flat head screws.

Security head machine screws and driver can be ordered for added security.

Finishes

605: Bright Brass
606: Satin Brass
611: Bright Bronze
612: Satin Bronze
613: Oil-rubbed Bronze
625: Bright Chrome
626: Satin Chrome
690: Dark Bronze Coated

Knobs: 2" or 2 1/8" Dia. brass or bronze in round or tulip style.

Latch: 1/2” throw deadlocking latch. Front: 2 1/4" x 1" x 5/32" Standard for 62K. (Optional for 63K), 2 1/4" x 1 1/8" x 5/32" Standard for 63K (Optional for 62K).

Lock and latchsets: Sets consist of latch complete with trim. Type and operation according to set number. Set also includes interchangeable core and two nickel silver keys, keyed to your system.

Material: Component parts include brass or bronze. Internal parts are brass or zinc dichromate steel. Mounting: 2 1/8" Dia. bore for lock housing, 1" Dia. or 7/8" Dia. for latch tube.

Options: KNL– Knurl keyed knob, L8– drive in-latch. Roses: C– 2 9/16" Dia. D– 3 3/8" Dia. Mounting screws concealed.

Strike: STK (standard)– 2 3/4" x 1 1/8" with curved lip & box (ANSI A115.2 for 1 3/8" doors). S3– 4 7/8" x 1 1/4" with curved lip and box (ANSI A115.2 for 1 3/4" doors).

Thickness of doors: 1 3/8" to 1 7/8" Standard. If thickness is greater, use our heavy duty locksets for specified door thickness

DOWNLOAD & RESOURCES

 

Manufacturer Resources

Product Specs

Series:
8K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Double Cylinder
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:
Corridor/Dormitory
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks

BEST 8K37C4ASTK626 – Frequently Asked Questions

1) What is a corridor function lock and how does it work?
Corridor function allows outside key entry at all times. Inside knob is always unlocked for free egress. The outside knob is locked except when operated by key. This function is ideal for apartment entries, office doors, and other spaces requiring controlled access with unrestricted exit.
2) What does SFIC less core mean for this lock?
SFIC stands for Small Format Interchangeable Core. This lock accepts SFIC cores but ships without the core installed. You must purchase and install a compatible SFIC core separately. This allows integration into existing master key systems and provides enhanced security through core interchangeability.
3) What door thickness does this Grade 1 lock accommodate?
Most commercial Grade 1 knob locks accommodate door thickness from 1-3/8" to 1-3/4" standard. Some models adjust for doors up to 2-1/4". Check the manufacturer template and specifications to verify compatibility with your specific door thickness before installation.
4) How do I determine the correct door handing for this lock?
Stand on the side of the door where the hinges are not visible. If hinges are on your right, it's right-handed. If on your left, it's left-handed. Most commercial knob locks are non-handed or field reversible. Verify the specific handing requirements with the manufacturer specifications.
5) What backset does this lock require?
Standard commercial locks typically use 2-3/4" backset. Some models offer adjustable backsets for 2-3/8" residential applications. Measure from the door edge to the center of the existing bore hole to determine your required backset. Verify compatibility before ordering.
6) What are the bore hole requirements for installation?
Standard commercial knob locks require a 2-1/8" bore hole through the door face and a 1" cross bore through the door edge. The cross bore must align precisely with the main bore. Use the manufacturer's template for exact measurements and drilling specifications.
7) Can this lock be used on fire-rated doors?
Fire-rated door applications require locks with specific fire ratings and approvals. Check if this model carries UL fire ratings and verify compliance with local fire codes. The lock installation must not compromise the door's fire rating. Consult fire safety codes for your specific application.
8) What grade rating does this lock carry?
This is specified as a Grade 1 lock, the highest ANSI/BHMA security and durability rating. Grade 1 locks undergo rigorous testing for cycle life, security, and finish durability. They're designed for high-traffic commercial applications and provide maximum security performance.
9) How do I maintain and adjust this commercial knob lock?
Lubricate the mechanism annually with graphite or approved lock lubricant. Check and tighten mounting screws periodically. Adjust latch alignment if the door sags or shifts. Clean exterior surfaces with mild soap and water. Avoid petroleum-based cleaners that can damage seals and finishes.
10) What tools are needed for installation?
Installation requires a drill with 2-1/8" hole saw for the main bore and 1" spade bit for the cross bore. You'll need a chisel set for mortising the latch and strike plates, screwdrivers, tape measure, and level. Use the manufacturer's template to ensure precise measurements and alignment.
11) Are there matching deadbolts available for this lock series?
Most commercial lock manufacturers offer coordinating deadbolts in matching finishes and key systems. Look for deadbolts from the same product series that accept SFIC cores. This ensures consistent appearance and allows integration into your master key system. Check our deadbolts section for compatible options.
12) What strike plate options work with this lock?
Commercial installations typically use heavy-duty strike plates with longer screws that penetrate the door frame studs. T-strike plates provide enhanced security for high-traffic applications. Box strikes accommodate doors with frame gaps. Match the strike plate to your frame type and security requirements.
How fast can I get the BEST 8K37C4ASTK626 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 8K37C4ASTK626 come with a warranty?
Absolutely. The BEST 8K37C4ASTK626 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 8K37C4ASTK626?
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 8K37C4ASTK626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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