BEST 6K Series - Storeroom (D)...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$360.00
$214.20
BEST BEST 6K Series - Storeroom (D) Function Grade 2 Single Cylinder Knob Locks, SFIC Less Core BEST-6K-D

BEST 6K Series - Storeroom (D) Function Grade 2 Single Cylinder Knob Locks, SFIC Less Core

(No reviews yet) Write a Review

Model: 6K37D4CSTK626
$360.00
$214.20
Selected Finish is
Selected Strike is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$360.00
$214.20
Adding to cart… The item has been added
Free Shipping on orders over $99
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

BEST 6K GRADE 2 CYLINDRICAL NON-KEYED KNOB LOCK

Reliable knob sets for standard traffic applications.

Our 6K series offers the quality and performance you expect from BEST for standard traffic applications. BEST door knob sets exceed ANSI Grade 2 standards and are built with design features that make the 6K a durable and secure choice for long-term reliability.

FEATURES

  • Quick rekeying by BEST interchangeable core.
  • Snap-on inside rose (no exposed mounting screws).
  • Threaded outside rose adjustable for door thickness.
  • Keyed knob is removable only after removal of core.
  • Internal steel mechanisms are corrosion treated for normal atmospheric conditions.
  • Lockset reversible for either hand of door without removing keyed knob.
  • Underwriters Laboratories®: 6K series – Listed by Underwriters Laboratories for use on 3 Hr, A label for single (4' x 8') doors.
  • Builders Hardware Manufacturers Association: 6K series – Listed by BHMA for A156.2, Series 4000, Grade 2.

STANDARD SPECIFICATIONS

Backset: 2 3/8" for 62K Series; 2 3/4" for 63K Series; 3 3/4" for 64K Series; 5" for 65K Series.

Case: 2 1/16" Dia. cylindrical, for 2 1/8" hole.

Finish: Standard finishes are 605, 606, 611, 612, 613, 625, 626.

Latch: 1/2” throw deadlocking latch (for models with latch options).

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) (for models with strike options).

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

Finishes

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

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

RESOURCES

6K Series Sell Sheet

6K Series FAQs

6K Series Catalog

6K Series Service Manual

BEST Product Warranty Reference Chart

Manufacturer Resources

Product Specs

Series:
6K Series
Grade:
Grade 2
Duty Level:
Medium Duty
Keyed Function:
Single Cylinder
Standard Latch:
1/2" Throw
Standard Strike:
2-3/4" x 1-1/8" with Curved Lip
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
Tags:
best lock, best lock door handle
Product Function:
Storeroom
Product Category:
Mechanical Locks

BEST 6K37D4CSTK626 – Frequently Asked Questions

1) What is a storeroom function lock and how does it work?
Storeroom function locks keep the outside knob locked at all times. Entry requires a key from outside. The inside knob always turns freely for exit. This provides secure storage room access with easy egress.
2) What does SFIC less core mean for these locks?
SFIC means Small Format Interchangeable Core. These locks accept removable cores but ship without cores installed. You must purchase compatible SFIC cores separately to complete the lock installation.
3) What door thickness do these knob locks fit?
Most commercial knob locks fit standard door thickness of 1-3/8" to 1-3/4". Check the manufacturer template for exact specifications. Some models accommodate doors up to 2-1/4" thick with extended spindles.
4) How do I determine the correct handing for these locks?
Stand outside the door. If hinges are on the right, it's right hand. If hinges are on the left, it's left hand. Many commercial knob locks are field reversible for either handing.
5) What finishes are typically available for 6K series knob locks?
Common commercial finishes include satin chrome, bright brass, satin brass, dark bronze, and black. Verify available finishes with specific model numbers as options vary by manufacturer and series.
6) What does Grade 2 security rating mean?
Grade 2 locks meet ANSI/BHMA standards for medium-duty commercial use. They withstand 400,000 cycles and specific force tests. Grade 2 provides good security for most commercial applications.
7) Can these locks be keyed alike or master keyed?
Yes, with SFIC cores you can create keying systems. Multiple locks can share the same key (keyed alike) or work within master key systems. Plan your keying requirements before ordering cores.
8) What tools are needed to install these knob locks?
You need a drill, hole saws (2-1/8" and 1" typically), wood bits, chisel, screwdriver, and measuring tape. Follow the manufacturer's template exactly for hole placement and depth.
9) How do I adjust the latch if the door doesn't close properly?
Check strike plate alignment first. The latch should enter the strike opening smoothly. File the strike opening slightly if needed. Ensure the door frame is square and the latch bolt extends fully.
10) What other 6K series functions are available?
The 6K series typically includes classroom, office, privacy, passage, and entrance functions. Each has different locking behaviors suited to specific applications. Browse our door hardware section for complete options.
11) Do these locks work in high-moisture environments?
Standard knob locks may corrode in high humidity. For wet areas, specify locks with appropriate corrosion resistance ratings or protective finishes. Check environmental ratings before installation in moisture-prone locations.
12) What backset measurement do these locks require?
Standard commercial backset is 2-3/4". Some models offer adjustable backsets for 2-3/8" residential applications. Measure from door edge to center of knob hole to confirm required backset before ordering.
How fast can I get the BEST 6K37D4CSTK626 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 6K37D4CSTK626 come with a warranty?
Absolutely. The BEST 6K37D4CSTK626 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 6K37D4CSTK626?
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 6K37D4CSTK626 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.
!