Name: BEST 9K Series Grade 1 Institutional Cylindrical Lever Lock with Double Cylinder Keying
Brand: BEST
SKU: 9K37W14CSTK626
Price: 695.65 USD
Availability: InStock

Product Overview
FAQs

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

Premium Commercial-Grade Security Solution

The BEST 9K Series represents the pinnacle of cylindrical lock engineering, combining top-quality materials with exceptional craftsmanship for demanding institutional applications. This Grade 1 double cylinder institutional lock features a 2-3/4" backset, 9/16" latch throw, and heavy-duty construction rated for commercial use. Built with corrosion-treated steel chassis components and brass critical elements, the 9K delivers maximum security with smooth, reliable operation for high-traffic environments.

Professional Features & Benefits

Grade 1 BHMA Certification: Listed by BHMA for A156.2, Series 4000, Grade 1 providing the highest level of commercial lock performance and durability.
Heavy-Duty Construction: Critical latch and chassis components are brass or corrosion-treated steel with zinc hubs and hardened steel alloy lever sleeve for maximum attack resistance.
Institutional Function: Double cylinder keying allows key control from both inside and outside levers for enhanced security in institutional environments.
Attack-Resistant Design: Rose locking pin assembly prevents twisting, bending, or breaking under attack while slotted key release cam maintains key access even when damaged.
Through-Bolt Mounting: Strong through-bolt mounting studs increase torque resistance and provide superior attachment strength compared to standard mounting methods.
Interchangeable Core Ready: Allows for quick re-keying and customized masterkeying systems for facility management flexibility.
ADA Compliant Operation: Design and operation meets ANSI A117.1 section 404.2.6 requirements for accessibility compliance.
10 Year Limited Warranty: Comprehensive manufacturer warranty provides long-term protection and confidence in product reliability.

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: Institutional
Lock Type: Cylindrical
Product Attribute: Cylindrical Locks
Product Category: Mechanical Locks
Product Function: Institutional
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

Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/4" to 2-1/4"), 2-1/8" diameter bore hole, and backset distance of 2-3/4".
Use manufacturer-provided templates to mark mounting hole locations accurately including two additional 5/16" diameter through-bolt holes at 12 o'clock and 6 o'clock positions.
Prepare door by drilling required holes including standard ANSI A115.2 preparation plus through-bolt holes using recommended drill jig for accuracy.
Install chassis assembly and secure with through-bolt mounting studs per manufacturer torque specifications for maximum attack resistance.
Adjust lever operation and latch alignment for proper function, ensuring smooth operation and proper strike engagement with 9/16" latch throw.
Test lock operation with keys from both inside and outside positions to verify proper institutional function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

Healthcare Institutions and Hospitals
Educational Facilities and Schools
Government and Municipal Buildings
Correctional and Detention Facilities
Mental Health and Treatment Centers
Senior Living and Care Facilities
High-Security Commercial Buildings

Anti-Microbial Option

Available with UltraShield antimicrobial protected coating (finish 626AM) that inhibits the growth of bacteria and other microbes on hardware surfaces. 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 critical components rated for Grade 1 commercial performance. Protected by multiple patents and backed by a 10 Year Limited Warranty, the 9K Series is engineered for demanding institutional applications where dependable security and smooth operation are essential. The combination of attack-resistant design features and ADA-compliant operation makes this the premium choice for facilities requiring the highest level of lock performance.

Manufacturer Resources

9K Series Catalog

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:: Institutional
Product Attribute:: Cylindrical Locks
Product Model:: S
Product Function:: Institutional
Door Hand Direction:: Non-Handed
Product Substrate:: Corrosion-Treated Steel
Product Category:: Mechanical Locks
Backset (Distance):: 2-3/4"
Department:: Door Hardware

BEST 9K37W14CSTK626 – Frequently Asked Questions

1) Will the BEST 9K institutional lever lock fit a standard 1-3/4 inch commercial door?

Yes. The 9K Series is prepped for 1-3/4 inch through 2-1/4 inch doors, with a 2-1/8 inch diameter bore and a 2-3/4 inch backset, plus two extra 5/16 inch through-bolt holes at the 12 and 6 o'clock positions. That is standard ANSI A115.2 prep plus the through-bolt holes, so if the door is already bored for a commercial cylindrical lock you are drilling two holes, not re-boring. A 1-3/8 inch door, the common older interior thickness, is below the range and needs a different lock.

2) What does the institutional (double cylinder) function on the BEST 9K actually do?

Both levers are keyed, and each one controls its own side. Turning the key in the outside lever locks or unlocks the outside lever; turning the key in the inside lever locks or unlocks the inside lever. The latch retracts by key from either lever, or by rotating whichever lever is currently unlocked. That means staff can be locked out of a space from the corridor side and locked in or out from the room side independently, which is why this function lands in detention, mental health, and secure treatment areas rather than on a normal office door. There is no thumbturn and no inside free egress when the inside lever is keyed locked, so check your egress requirements for the opening before you specify it.

3) Is the BEST 9K lock handed, or do I need to specify left or right hand?

Non-handed. The 9K cylindrical lever lock installs on a left or right hand door without reversing anything, so you order one part number regardless of swing. For a facility standardizing across dozens of openings that removes the most common ordering mistake on lever locks.

4) Will the BEST 9K latch into the strike that is already in my frame?

The 9K throws a 9/16 inch latchbolt and ships standard with a 2-3/4 x 1-1/8 inch strike with a curved lip and box. Two strike choices are offered: the STK 2-3/4 inch ANSI strike and the S3 4-7/8 inch ANSI strike. If your frame is cut for a full 4-7/8 inch ANSI strike, order the S3 and you drop into the existing cutout. If the frame has the smaller T-strike prep, order the STK. Matching the strike to the existing frame prep is what saves you filing or re-prepping the jamb.

5) Can the BEST 9K be ordered with a deeper backset for a wide stile or thick door edge?

Three backsets are available on the 9K: 2-3/4 inch, 3-3/4 inch, and 5 inch. The 2-3/4 inch is the standard commercial backset and what the lock is specified at; the 3-3/4 and 5 inch options exist for openings where the lever needs to sit further off the door edge. Measure from the door edge to the center of the existing bore before ordering, because the backset has to match the hole that is already in the door.

6) Does the BEST 9K take interchangeable cores so I can key it into our existing master system?

Yes, the 9K is interchangeable core ready, which is the reason most institutions buy BEST in the first place. Cores pull and swap with a control key, so re-keying a wing after a staff change is a minute per door rather than a locksmith visit, and the lock drops into an existing masterkey hierarchy. On the double cylinder version both the inside and outside lever carry a cylinder, so plan for two cores per opening.

7) Is the BEST 9K lever lock Grade 1 and does it meet ADA lever requirements?

It is listed by BHMA to A156.2, Series 4000, Grade 1, the top commercial durability tier, and carries the F11 ANSI/BHMA function designation. Operation meets ANSI A117.1 section 404.2.6 for accessibility, which is the lever-operation clause an inspector looks at on a public-facing opening. Duty level is heavy duty and it is a commercial, non-electronic lock.

8) What do I have to specify when ordering a BEST 9K institutional lever lock?

Five choices decide the part: backset (2-3/4, 3-3/4 or 5 inch), lever style (Contour with Angle Return, Curved with Return, or Curved without Return), rose style (C rose at 3 inch convex or D rose at 3-1/2 inch convex), strike (STK 2-3/4 inch ANSI or S3 4-7/8 inch ANSI), and finish. Twelve finishes are offered, from 605 bright brass and 606 satin brass through 611 bright bronze, 612 satin bronze, 613 oil-rubbed, 618 bright nickel, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, 626AM antimicrobial satin chrome, and 690 statuary dark bronze. If you are matching existing doors, the rose diameter is the one people forget: a 3-1/2 inch D rose covers scars a 3 inch C rose will not.

9) What is the difference between the BEST 9K institutional lock and an asylum function lock like the Dexter C1000 or Arrow MK33?

All three are keyed on both sides for secure-facility use, but they differ in grade and trim. The BEST 9K is Grade 1 with a lever and a 2-3/4 inch backset. The Dexter C1000 Asylum (F87) is Grade 1 and fits 1-3/8 to 2 inch doors, which covers thinner doors the 9K does not. The Arrow MK33-BD-CS is Grade 2, heavy duty, and comes with a ball knob rather than a lever with a conventional cylinder in Schlage C keyway, so it is not an ADA lever solution and it will not take a BEST interchangeable core. If your facility is standardized on BEST small format cores, the 9K is the one that keys into that system.

10) I need a Grade 1 lever lock but the door is 1-3/8 inch thick. What do I use instead of the BEST 9K?

The 9K starts at 1-3/4 inch, so a 1-3/8 inch door is out. The Falcon K101 is a Grade 1 heavy duty cylindrical lever, fire rated, and covers 1-3/8 to 2-1/4 inch doors, though it is passage function with no keying. On the keyed side the Dexter C1000 Grade 1 locks run 1-3/8 to 1-3/4 inch in classroom, classroom security, and entry/office functions, and the C1000 Asylum covers 1-3/8 to 2 inch with keying on both sides, which is the closest function match to the 9K on a thin door.

11) For a classroom door instead of a key-both-sides institutional door, what Grade 1 cylindrical lever should be used?

The Dexter C1000 Series classroom lever is a Grade 1 cylindrical keyed lever with clutching, built for the classroom function where the outside lever is locked and unlocked by key and the inside lever always retracts the latch for egress. A classroom security version, the Dexter C1000 classroom security, is also Grade 1 and keyed both sides at the lever from inside as well. The BEST 9K double cylinder institutional function keys both the inside and outside lever, so the inside lever can be locked against egress -- that is correct for a detention or treatment room and wrong for a classroom.

12) Which finish should I order for a hospital or elder care facility?

Order finish 626AM, satin chrome with UltraShield antimicrobial coating, which inhibits growth of bacteria and other microbes on the hardware surface. BEST recommends it for healthcare, elderly care, education, transportation, food service, and hospitality, and it matches plain 626 satin chrome visually so you can mix it into a building already standardized on 626 without the levers looking different.

13) Why choose a cylindrical lever lock like the BEST 9K instead of a mortise lock?

A cylindrical bored lock goes into a 2-1/8 inch round bore and a latch bore, so it installs and services far faster than a mortise lock, which needs a milled pocket in the door edge. The 9K gets its strength back through construction instead of a mortise case: brass or corrosion-treated steel latch and chassis parts, zinc hubs, a hardened steel alloy lever sleeve, a rose locking pin that resists twisting and bending, and through-bolt mounting studs for torque resistance. For retrofit work on doors already bored for cylindrical hardware, this is the path that does not involve re-machining the door.

14) The BEST 9K double cylinder is more security than I need on this door. What else works for a school or office opening?

Double cylinder keying on both levers is aimed at detention and treatment openings. For a classroom door, the Dexter C1000 Classroom is Grade 1, clutching, keyed, for 1-3/8 to 1-3/4 inch doors, and the Dexter C1000 Classroom Security version adds key control from inside. For a storeroom or a door that stays locked outside, the Cal-Royal AG05 is a Grade 2 storeroom lever with a deadlocking latchbolt for 1-3/8 to 1-3/4 inch doors, and the Hager 2580 is a Grade 2 storeroom lever for 1-3/8 to 2 inch doors. For an office or entry function, the Dexter C1000 Entry/Office is Grade 1 for 1-3/8 to 1-3/4 inch doors. All of those cost you the second cylinder you do not need.

15) Will the BEST 9K hold up on a high traffic corridor where people hang on the levers?

That abuse is what the chassis is built around. Critical latch and chassis parts are brass or corrosion-treated steel, the hubs are zinc, and the lever sleeve is hardened steel alloy. A rose locking pin assembly resists twisting, bending, and breaking, and through-bolt mounting studs give more torque resistance than standard mounting screws, which is where lever locks usually loosen first on a busy opening. There is also a slotted key release cam so the key still works if the cylinder is damaged. That combination is what carries the Grade 1, heavy duty rating.

16) What is the difference between the BEST 9K institutional lever and a Corbin Russwin CL33903 electrified lever?

The Corbin Russwin CL33903 is a Grade 1 electrified cylindrical lever in fail safe configuration running on 12VAC/DC, for doors 1-3/4 inch to 2 inch thick, and it needs power run to the door and a transfer hinge or power transfer. The BEST 9K is a mechanical lock with no electronic components, controlled entirely by key from the inside and outside levers. Specify the CL33903 when the lock has to release on an access control or fire alarm signal; specify the 9K when the opening is controlled by keys alone.

17) What Grade 1 cylindrical lever works on a corridor or closet door that does not need to lock?

Several Grade 1 non-keyed cylindrical levers cover that opening. The Falcon K101 is a Grade 1 heavy duty passage lock with non-handed levers, fire rated, for doors 1-3/8 inch to 2-1/4 inch thick. The Falcon T101 is a Grade 1 heavy duty passage lever with pressure release technology. The Corbin Russwin CL3110 is a Grade 1 vandal resistant passage/closet lever, fire rated, for doors 1-3/4 inch to 2 inch. The Design Hardware X75 is a Grade 1 passage lever lockset with a flat lever for 1-3/4 inch doors. All are non-keyed, so none of them replaces the BEST 9K where key control from both sides is the requirement.

18) Is there a lighter duty keyed lever for back-of-house doors that do not need Grade 1?

Yes. The Cal-Royal AG05 is a Grade 2 storeroom lever lockset with a deadlocking latchbolt for doors 1-3/8 inch to 1-3/4 inch thick, and the Hager 2580 is a Grade 2 storeroom cylindrical lock with a Withnell lever for doors 1-3/8 inch to 2 inch. Both are keyed on the outside only. The BEST 9K is Grade 1 heavy duty and is keyed on both the inside and outside lever, which is the reason to specify it on a door where staff need to secure the room from the inside as well.

19) Can a keypad lever replace the BEST 9K where keys are being lost?

A mechanical keypad lever changes the credential, not the function. The Lockey 1150 is a heavy duty mechanical keypad lever set in passage function for doors 1-1/8 inch to 2 inch thick, and the Lockey 2835DC is a double combination keyless lever lock, also passage function, for doors 1-3/16 inch to 2 inch. The Delaney LP250 is a Grade 2 electronic keypad leverlock. None of these carries the BEST 9K institutional function, where the inside lever itself can be locked by key, and none accepts an interchangeable core into an existing master key system.

20) Which lock should be used on an office door in the same building as the BEST 9K institutional rooms?

The Dexter C1000 entry/office lever is a Grade 1 clutching keyed cylindrical lock in entrance/office function for doors 1-3/8 inch to 1-3/4 inch thick, which matches the Grade 1 level of the BEST 9K while giving the occupant push-button or key control of the outside lever only. The Hager 2525 is a Grade 2 commercial entry lever for doors 1-3/8 inch to 2 inch, and the Falcon B511CP6D is a Grade 2 medium duty entry/office lever. Reserve the 9K double cylinder function for rooms that must be secured from the inside as well.

21) What pairs with a BEST 9K on a door that only needs a pull side lever with no latch?

A dummy lever is the correct companion on an inactive leaf or a pull-only door. The Accentra 455LN Augusta is a heavy duty Grade 1 single dummy cylindrical lever, matching the Grade 1 level of the BEST 9K, and the Callan Bentley is a Grade 2 dummy lever. The 9K itself is always a keyed cylindrical lock with a 9/16 inch latch throw and a 2-3/4 x 1-1/8 inch strike with curved lip and box, so it is not ordered in a dummy configuration.

22) Is a Grade 3 lever an acceptable substitute for a BEST 9K on a light-traffic door?

Grade 3 levers such as the Cal-Royal AUS00 entrance/office lock, which has a solid brass forged body and fits doors 1-3/8 inch to 1-3/4 inch, or the Callan Artino and Bennett entrance leversets, sit two grade levels below the BEST 9K, which is certified Grade 1 heavy duty for commercial use. On a low-traffic interior door in a residential-style building a Grade 3 lever is a normal specification; on an institutional corridor or a door carrying a Grade 1 line item on the hardware schedule it will not meet the spec.

23) Does the Accentra 107S Schlage cylinder adapter work with a BEST 9K?

No. The Accentra 107S is a Schlage cylinder adapter kit made for Yale hardware, not for BEST chassis. The BEST 9K is built around an interchangeable core for quick rekeying and masterkeying, so cylinder changes on the 9K are handled by swapping the core rather than by fitting an adapter for a different manufacturer's cylinder.

How fast can I get the BEST 9K37W14CSTK626 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 9K37W14CSTK626 come with a warranty?

Absolutely. The BEST 9K37W14CSTK626 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 9K37W14CSTK626?

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

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