BEST 9K Series Communicating G...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,123.00
$695.65
BEST BEST 9K Communicating (S) Lock - Grade 1 Cylindrical Keyed Lever Lock BES-9K-S-KEYED

BEST 9K Series Communicating Grade 1 Cylindrical Lever Lock with Double Cylinder Keying

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Model: 9K37S14CSTK626
$1,123.00
$695.65
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Selected Lever Style is
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,123.00
$695.65
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BEST 9K Series Communicating Grade 1 Cylindrical Lever Lock with Double Cylinder Keying

Premium Commercial-Grade Security Solution

The BEST 9K Series cylindrical lever lock delivers professional-grade security with Grade 1 BHMA certification and heavy-duty construction. This communicating function lock features double cylinder keying for maximum access control, 2-3/4" backset, and 9/16" latch throw for reliable performance. Built with corrosion-treated steel chassis and brass components, this lock is engineered for demanding commercial applications requiring superior durability and attack resistance.

Professional Features & Benefits

  • Grade 1 BHMA Certification: A156.2 Series 4000 Grade 1 listing ensures maximum durability and security for heavy-duty commercial applications.
  • Attack-Resistant Design: Rose locking pin and assembly design offers exceptional torque resistance, preventing twisting, bending, or breaking under attack.
  • Innovative Key Access Protection: Slotted key release cam and locking lug assembly provide maximum attack resistance while maintaining key access even when damaged.
  • Heavy-Duty Construction: Corrosion-treated steel chassis with brass latch components and zinc hubs with shrouded locking lug for superior quality and torque resistance.
  • Smooth Operation: Hub-mounted torsion spring and strong retractor springs prevent lever sag and provide smooth, snappy operation throughout the lock’s service life.
  • Reinforced Mounting: Strong through-bolt mounting studs increase torque resistance with heavy rose liner material for enhanced attack resistance.
  • Interchangeable Core Ready: Allows for quick re-keying and customized master keying systems for flexible access control management.
  • 10 Year Limited Warranty: Comprehensive manufacturer warranty provides added confidence and long-term protection for your investment.

Technical Specifications

  • ANSI/BHMA: F11
  • Backset (Distance): 2-3/4"
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Hand Direction: Non-Handed
  • Duty Level: Heavy Duty
  • Electronic: No
  • Function Description: Latch: Turning the key in the inside/outside lever, Rotating the inside or outside lever. Outside lever lock or unlocked by turning the key in the outside lever. Inside lever is locked or unlocked by turning the key in the inside lever
  • Grade: Grade 1
  • Handle Type: Lever
  • Keyed: Yes
  • Keyed Function: Double Cylinder
  • Lock Function: Communicating
  • Lock Type: Cylindrical
  • Product Attribute: Cylindrical Locks
  • Product Category: Mechanical Locks
  • Product Function: Communicating
  • Product Group: Mechanical Locks
  • Product Model: S
  • Product Subgroup: Bored Locksets
  • Product Substrate: Corrosion-Treated Steel
  • Product Type: Leversets
  • Series: 9K Series
  • Standard Latch: 9/16" Throw
  • Standard Strike: 2-3/4 x 1-1/8" with curved lip and box
  • Subcategory: Cylindrical Locks
  • Warranty: 10 Year Limited

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/4" to 2-1/4" standard), backset (2-3/4" standard), and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces, including two additional 5/16" diameter holes for through-bolts at 12 o’clock and 6 o’clock positions.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions, ensuring 2-1/8" hole for chassis installation.
  4. Install all mounting hardware including through-bolt mounting studs and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion, ensuring 9/16" latch throw engagement.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Anti-Microbial Option

BEST UltraShield™ antimicrobial protected coating is available (finish 626AM) to inhibit the growth of bacteria and other microbes on hardware surfaces. This option is recommended for healthcare, elderly care, education, transportation, food service, and hospitality applications where product cleanliness is a high priority.

Why Choose BEST Quality?

BEST 9K Series cylindrical locks deliver professional-grade reliability with corrosion-treated steel construction and brass components rated for Grade 1 heavy-duty performance. The 10 Year Limited warranty and BHMA A156.2 Series 4000 certification provide added confidence for demanding commercial applications. Engineered with innovative attack-resistant features and interchangeable core capability, the 9K Series ensures dependable security where professional performance is essential.

Product Specs

Series:
9K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Handle Type:
Lever
Keyed Function:
Double Cylinder
Warranty:
10 Year Limited
Standard Latch:
9/16" Throw
Standard Strike:
2-3/4 x 1-1/8" with curved lip and box
ANSI/BHMA:
F11
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Leversets
Subcategory:
Cylindrical Locks
Keyed:
Yes
Electronic:
No
Commercial/Residential:
Commercial
Function Description:
Latch: Turning the key in the inside/outside lever, Rotating the inside or outside lever. Outside lever lock or unlocked by turning the key in the outside lever. Inside lever is locked or unlocked by turning the key in the inside lever
Lock Type:
Cylindrical
Lock Function:
Communicating
Product Attribute:
Cylindrical Locks
Product Model:
S
Product Function:
Communicating
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Product Substrate:
Corrosion-Treated Steel
Backset (Distance):
2-3/4"
Department:
Door Hardware

BEST 9K37S14CSTK626 – Frequently Asked Questions

1) What does the communicating function on a BEST 9K lever lock actually do?
Communicating (F11) means there are cylinders on both sides and each lever is controlled independently. Turning the key in the outside lever locks or unlocks that outside lever; turning the key in the inside lever locks or unlocks the inside lever. Either lever retracts the latch when unlocked, and a key turn in either lever also retracts it. That is the setup used between two adjoining rooms, such as connecting hotel rooms or paired offices, where each side needs its own control. If you only need key control from one side, this is the wrong function.
2) Will the BEST 9K communicating lock fit a 5 inch backset door prep?
Yes. The 9K communicating lever lock is offered in 2-3/4 inch, 3-3/4 inch and 5 inch backsets. 2-3/4 inch is the standard commercial prep and the catalog default; the 3-3/4 and 5 inch options are there for doors with wide stiles or glass lites where the bore sits further from the edge. Pick the backset to match the existing 2-1/8 inch cross bore location on the door.
3) What door prep does the BEST 9K cylindrical lever lock require?
A 2-1/8 inch cross bore for the chassis, a 2-3/4 inch backset as standard, plus two 5/16 inch diameter holes at the 12 and 6 o'clock positions for the through-bolt studs. Door thickness of 1-3/4 inch to 2-1/4 inch is standard. That is a conventional cylindrical prep, so it drops into most existing commercial bored-lock openings.
4) Will the 9K latch work with the strike already in my frame?
The standard latch throws 9/16 inch and the standard strike is a 2-3/4 x 1-1/8 inch with curved lip and box. If your frame has that ANSI-prep strike you can reuse it. For a full 4-7/8 inch ANSI frame prep, order the S3 strike option instead of the STK 2-3/4 inch strike. Check lip length against your jamb so the latch is guided, not just met.
5) Can BEST 9K locks be re-keyed into an existing master key system?
Yes. The 9K is interchangeable core ready, so a locksmith can pull and swap cores for fast re-keying and build it into a master keying hierarchy. On a communicating lock, remember there are two cylinders per door, so plan two cores per opening.
6) Is this lock heavy duty enough for a school or hospital corridor?
The 9K carries BHMA A156.2 Series 4000 Grade 1 listing, which is the highest cylindrical lockset grade and the one written into most institutional specs. Construction is corrosion-treated steel chassis with brass latch components and zinc hubs with a shrouded locking lug, a hub-mounted torsion spring to stop lever sag, and through-bolt studs for torque resistance. It is a commercial, heavy duty lock.
7) What do I have to specify to order a 9K communicating lock correctly?
Five choices: backset (2-3/4, 3-3/4 or 5 inch), finish (twelve options from 605 bright brass through 690 statuary dark bronze, including 626AM antimicrobial), lever style (Contour with angle return, Curved with return, or Curved without return), rose style (C rose 3 inch convex or D rose 3-1/2 inch convex), and strike (STK 2-3/4 inch ANSI or S3 4-7/8 inch ANSI). Handing is not a variable, the lock is non-handed.
8) Can I use this on a 1-3/8 inch interior door?
No. The 9K is prepped for 1-3/4 inch to 2-1/4 inch doors, which is standard commercial thickness and up. For a thinner 1-3/8 inch leaf, look at a lever rated down to that range, such as the Hager 2510 at 1-3/8 to 2 inches or the Falcon K101 at 1-3/8 to 2-1/4 inches.
9) What is a Grade 1 alternative to the BEST 9K communicating lever lock when the opening only needs a storeroom function?
The BEST 9K S is a communicating function lock with double cylinder keying, meaning both the inside and outside levers are locked or unlocked by their own key. If the opening only needs an always-locked outside lever with free egress, that is a storeroom function, and the Cal-Royal AG05 is a Grade 2 storeroom lever lockset with a deadlocking latchbolt. Note the grade difference: the BEST 9K carries a Grade 1 rating while the AG05 is Grade 2, so for heavy-traffic commercial openings the 9K is the closer match to the duty level.
10) I do not need either side keyed - what non-keyed Grade 1 cylindrical lever should I use instead of the BEST 9K communicating lock?
The BEST 9K S is keyed on both sides for communicating service. For an opening that needs no locking at all, the Falcon K101 is a Grade 1 heavy duty passage cylindrical lock with non-handed levers and a fire rating, or the Corbin Russwin CL3110 is a Grade 1 vandal resistant passage/closet cylindrical lever lock, also fire rated. Both stay at the Grade 1 duty level of the 9K while removing the cylinders.
11) What is the closest Grade 1 substitute for a BEST 9K lever lock on a classroom door?
The BEST 9K S is built for communicating openings, not classrooms. For classroom service at the same Grade 1 level, the Dexter C1000 classroom cylindrical lever lock is keyed with a clutching lever, and the Dexter C1000 classroom security version adds key control of both levers. The C1000 classroom models list a 1-3/8 inch to 1-3/4 inch door thickness range, while BEST publishes 1-3/4 inch to 2-1/4 inch as standard for the 9K, so confirm your door thickness before switching.
12) Do I need to worry about handing when ordering a 9K communicating lever lock?
No. The 9K lever lock is non-handed, so one part works on a left or right hand door. Lever style and rose still need to be specified, but you do not have to establish the swing before ordering.
13) Is there an antimicrobial finish option for healthcare doors?
Yes, finish 626AM is satin chrome with the BEST UltraShield antimicrobial coating, intended for healthcare, elderly care, education, transportation, food service and hospitality work where surface cleanliness matters. It is one of twelve finishes offered, alongside 626 plain satin chrome, 619 satin nickel, 622 matte black, 613 oil-rubbed bronze and 690 statuary dark bronze among others.
14) What are my alternatives if I need a Grade 1 cylindrical lever but not the communicating function?
The 9K communicating version keys both sides independently, which most openings do not need. For a Grade 1 non-keyed passage lever, the Falcon K101 covers 1-3/8 to 2-1/4 inch doors and is fire rated, or the Corbin Russwin CL3110 passage lever covers 1-3/4 to 2 inch doors. For keyed classroom or storeroom duty, the Dexter C1000 Series is Grade 1 in classroom and classroom security functions at 1-3/8 to 1-3/4 inch thickness. Match function first, then grade.
15) What stops the levers from sagging or being twisted off on a high traffic door?
Three things in the 9K chassis. A hub-mounted torsion spring plus strong retractor springs hold the lever level over the life of the lock. Through-bolt mounting studs, landing in 5/16 inch holes at 12 and 6 o'clock, tie the two sides together so torque is not carried by the rose screws. And a rose locking pin with a heavy rose liner resists twisting and prying. The key release cam is slotted so key access survives damage to the lever.
16) What should I use instead of the BEST 9K lever lock if the door needs electrified access control?
The BEST 9K S is a mechanical lock with no electronic components. For an electrified cylindrical lever at the same Grade 1 level, the Corbin Russwin CL33903 is a fail safe electrified cylindrical lever lock running on 12VAC/DC, listed for 1-3/4 inch to 2 inch doors. The CL33903 is also offered with an NZ lever and D rose. Keyless mechanical options include the Lockey 2835DC double combination keyless lever lock for 1-3/16 inch to 2 inch doors.
17) Is a privacy lever like the Hager 2540 or Arrow MK02 an equivalent to the BEST 9K communicating lock?
No. The BEST 9K S is a keyed communicating lock, double cylinder, where a key in either lever locks or unlocks that side. The Hager 2540 is a Grade 2 lock with a Withnell lever and the Arrow MK02-TA is a privacy cylindrical lock with a Tudor knob - both are non-keyed privacy-style products with no cylinder for key control, and the MK02-TA uses a knob rather than a lever. They suit bath and bedroom openings, not an opening that needs keyed control from both sides.
18) Is there a lighter-duty lever lock I can use in place of the BEST 9K on low-traffic interior doors?
The BEST 9K S is a Grade 1 heavy duty commercial lock. On interior openings that see little traffic, Grade 2 and Grade 3 levers are common: the Accentra 5301LN Augusta is a Grade 2 passage/closet cylindrical lever, the Hager 2510 is a Grade 2 passage lever for 1-3/8 inch to 2 inch doors, and the Callan Asheville is a Grade 3 passage leverset. All three are passage function with no keying, so they cannot replace the keyed communicating control of the 9K on a door that needs it.
19) The BEST 9K uses interchangeable cores - what if my building is keyed to Schlage C?
The BEST 9K S is interchangeable core ready for quick re-keying and master keying. If the facility standard is a Schlage C keyway instead, the Cal-Royal AG03 classroom lever and AG00 entrance lever are supplied with a 6-pin Schlage C keyway keyed different, and the Arrow MK33-BD-CS asylum cylindrical lock uses a conventional cylinder in Schlage C. For Yale hardware, the Accentra 107S is a Schlage cylinder adapter kit.
20) What do I order for the inactive leaf of a pair when the active leaf gets a BEST 9K communicating lock?
The BEST 9K S is a functioning keyed lockset; an inactive or false leaf takes a dummy trim instead. Options include the Accentra 455LN Augusta, a Grade 1 single dummy cylindrical lever lock, the Callan Bentley Grade 2 dummy lever, and the Baldwin Estate 5103 half dummy lever with 5048 rose, which is ordered left hand or right hand. The Accentra 455LN matches the 9K on Grade 1; the Baldwin half dummies are handed while the 9K itself is non-handed.
21) How does the BEST 9K compare with the Falcon T101 for a heavy-use commercial corridor?
Both are Grade 1 heavy duty cylindrical lever locks. The Falcon T101 is a passage function lever with pressure release technology, so it latches without any keying. The BEST 9K S is a keyed communicating lock with double cylinder keying and a 9/16 inch latch throw, shipping with a 2-3/4 by 1-1/8 inch strike with curved lip and box. Pick the T101 where the corridor door never locks, and the 9K where each side needs its own key control.
22) What Grade 1 lever should I use on a behavioral health or utility room door instead of the BEST 9K?
Asylum function is the usual call there rather than communicating. The Dexter C1000 asylum lock is a Grade 1 cylindrical lock in the F87 asylum function with a 1-3/8 inch to 2 inch door thickness range. The Arrow MK33-BD-CS is an asylum cylindrical lock with a ball knob and a conventional cylinder. The BEST 9K S carries the F11 ANSI/BHMA function designation and a 2-3/4 inch standard backset for comparison when you are matching existing door prep.
23) Which rose size should I pick to cover the old lock's wear marks?
Two convex roses are offered: the C rose at 3 inches and the D rose at 3-1/2 inches. When you are replacing older hardware that left a larger footprint or paint shadow on the door face, the 3-1/2 inch D rose covers more. If you are standardizing trim across a building, pick one and stay with it.
24) Can a residential-grade lever such as the Kwikset Breton stand in for the BEST 9K on a commercial door?
The BEST 9K S is specified commercial, Grade 1, heavy duty, with a corrosion-treated steel chassis. The Kwikset 200BRNL Breton passage and 300BRNL Breton privacy levers are Grade 3 and list a 1-3/8 to 1-3/4 inch door thickness range. They are built for interior residential openings and neither offers the keyed double cylinder control of the 9K, so they are not a like-for-like swap on a commercial opening.
How fast can I get the BEST 9K37S14CSTK626 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 9K37S14CSTK626 come with a warranty?
Absolutely. The BEST 9K37S14CSTK626 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 9K37S14CSTK626?
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 9K37S14CSTK626 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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