Name: BEST 9K Series Grade 1 Cylindrical Entrance/Office Lock with Keyed Lever
Brand: BEST
SKU: 9K37UA14CSTK626
Price: 609.04 USD
Availability: InStock

Product Overview
FAQs

BEST 9K Series Grade 1 Cylindrical Entrance/Office Lock with Keyed Lever

Premium Commercial-Grade Security Solution

The BEST 9K Series cylindrical lock delivers exceptional quality, performance, and security for demanding commercial applications. This Grade 1 entrance/office lock features a 2-3/4" backset with 9/16" latch throw and accommodates door thickness from 1-3/4" to 2-1/4". Built with critical latch and chassis components of brass or corrosion-treated steel, the 9K series combines top-quality materials with exceptional craftsmanship for long-lasting reliability.

Professional Features & Benefits

Door Compatibility: Designed for 1-3/4" to 2-1/4" door thickness with 2-3/4" standard backset for versatile installation options.
Heavy-Duty Construction: Critical latch and chassis components are brass or corrosion-treated steel with zinc hubs featuring shrouded locking lug for maximum torque resistance.
Attack-Resistant Design: Rose locking pin and assembly design prevents twisting, bending, or breaking under attack while maintaining key access even when damaged.
Smooth Operation: Hub-mounted torsion spring and strong retractor springs prevent lever sag and provide smooth, snappy operation throughout the full range of motion.
Reinforced Mounting: Strong through-bolt mounting studs with two 5/16" diameter holes at 12 and 6 o'clock positions increase torque resistance and security.
Interchangeable Core System: Allows for quick re-keying and customized master keying for flexible access control management.
Lost Motion Feature: Optional 45° lever rotation in either direction without engaging retractor assembly for specialized applications.
Manufacturer Warranty: 10 Year Limited warranty for added confidence and protection in commercial installations.

Technical Specifications

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 operated by: Rotating the inside lever/ outside lever (only when the inside push button is out), Turning the key in the outside lever. Inside lever is always unlocked and cannot be locked.
Grade: Grade 1
Handle Type: Lever
Keyed: Yes
Keyed Function: Single Cylinder
Lock Function: Entrance/Office
Lock Type: Cylindrical
Product Attribute: Cylindrical Locks
Product Category: Mechanical Locks
Product Function: Entrance/Office
Product Group: Mechanical Locks
Product Model: UA
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"), backset (2-3/4" standard), and handing as applicable to this product.
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 and 6 o'clock positions.
Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions, conforming to ANSI A115.2 standards.
Install all mounting hardware including through-bolt mounting studs and secure the device to door and frame per manufacturer torque specifications.
Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion, ensuring proper function of the entrance/office mechanism.
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

The BEST UltraShield™ antimicrobial protected coating (finish 626AM) is available for applications where product cleanliness is a high priority, including hospitals, healthcare facilities, elderly care, education, transportation, food service, and hospitality environments. This finish inhibits the growth of bacteria and other microbes on the hardware surface.

Why Choose BEST Quality?

BEST 9K Series cylindrical locks deliver professional-grade reliability with brass and corrosion-treated steel construction rated for heavy-duty commercial applications. The 10 Year Limited warranty provides added confidence for demanding installations. Engineered with attack-resistant design features and Grade 1 BHMA certification, the 9K series ensures dependable performance where security and durability are essential.

Manufacturer Resources

9K Series Catalog

Service Manual for 9K Series

Product Specs

Series:: 9K Series
Subcategory:: Cylindrical Locks
Grade:: Grade 1
Duty Level:: Heavy Duty
Handle Type:: Lever
Keyed Function:: Single Cylinder
Warranty:: 10 Year Limited
Standard Latch:: 9/16" Throw
Standard Strike:: 2-3/4 x 1-1/8" with curved lip and box
Product Group:: Mechanical Locks
Product Subgroup:: Bored Locksets
Product Type:: Leversets
Keyed:: Yes
Electronic:: No
Commercial/Residential:: Commercial
Function Description:: Latch operated by: Rotating the inside lever/ outside lever (only when the inside push button is out), Turning the key in the outside lever. Inside lever is always unlocked and cannot be locked.
Lock Type:: Cylindrical
Lock Function:: Entrance/Office
Product Attribute:: Cylindrical Locks
Product Model:: UA
Product Function:: Entrance/Office
Door Hand Direction:: Non-Handed
Product Category:: Mechanical Locks
Product Substrate:: Corrosion-Treated Steel
Backset (Distance):: 2-3/4"
Department:: Door Hardware

BEST 9K37UA14CSTK626 – Frequently Asked Questions

1) Will the BEST 9K entrance/office lock fit a 2 inch thick door?

Yes. The 9K Series cylindrical lockset covers door thicknesses from 1-3/4 inches up to 2-1/4 inches, so a 2 inch door is inside the range with no extra parts. On a standard 1-3/4 inch commercial door it fits as-is. If your doors are 1-3/8 inch (common on older interior openings), the 9K is not the right chassis.

2) What backset does the BEST 9K lever lock need, and can I get it for a wider stile or a deeper backset?

Standard is a 2-3/4 inch backset, which is one of the two usual commercial bore positions. The 9K is also built in 3-3/4 inch and 5 inch backsets for doors where the bore sits deeper from the edge, so an existing off-standard prep can often be matched without redrilling.

3) How does the entrance/office function on the BEST 9K actually work day to day?

The inside lever always retracts the latch and can never be locked, so the room is always free to exit. Outside, the lever only turns when the inside push button is out; push the button in and the outside lever is locked until someone turns a key in it or the button is released. That is the classic office setup: staff button it down when they leave, key in when they return.

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

The latch throws 9/16 inch and ships against a 2-3/4 x 1-1/8 inch strike with a curved lip and box. If your frame carries that strike, or the 4-7/8 inch ANSI strike, both are available on the 9K, so you can order to match what is cut into the frame rather than patching the jamb. A frame prepped for a 4-7/8 inch ANSI cutout needs the S3 strike, not the standard one.

5) Do I have to specify a hand when ordering a BEST 9K lever lock?

No handing to specify. The 9K cylindrical chassis is non-handed, so one lockset works on a left or right hand door and you do not need to stock two versions across a building.

6) Can BEST 9K locks be master keyed and rekeyed without pulling the lock off the door?

Yes. The 9K takes a BEST interchangeable core, so a control key pulls the core and a new one drops in, no disassembly of the chassis. That is what makes it practical to rekey a whole floor after a tenant change and to run master and grand master levels across a facility. It is a single cylinder lock, keyed on the outside lever only.

7) What do I need to specify to order a BEST 9K entrance lock correctly?

Five choices decide the part: backset (2-3/4, 3-3/4 or 5 inch), finish, 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), and strike (2-3/4 inch ANSI or 4-7/8 inch ANSI). The larger D rose is the one to pick when you are covering an oversized or previously drilled hole in the door face.

8) Is the BEST 9K rated for high traffic corridors and Grade 1 spec?

Grade 1, heavy duty, commercial. Critical latch and chassis parts are brass or corrosion-treated steel, zinc hubs carry a shrouded locking lug for torque resistance, and a hub-mounted torsion spring keeps the lever from sagging over time, which is the usual failure on a busy office or school door. If your drawing calls for Grade 1 cylindrical, this meets it.

9) What is the closest Grade 1 cylindrical entrance/office lever lock to the BEST 9K UA from another manufacturer?

The Dexter C1000 Series entry/office cylindrical lever lock is the nearest match. Both are Grade 1 keyed cylindrical lever locks in the entrance/office function, so the door opening and the way the lock behaves day to day are the same. The Dexter C1000 entry/office uses a clutching lever and covers doors 1-3/8 inch to 1-3/4 inch thick, while the BEST 9K UA is built for 1-3/4 inch to 2-1/4 inch doors, so on a thicker door leaf the 9K is the one that fits. The 9K also takes an interchangeable core, which matters if the building is already keyed on a small format core system.

10) Is there a lighter-duty entrance/office lever lock that costs less to specify than a BEST 9K UA?

Yes. The Falcon B511CP6D is a Grade 2 medium duty cylindrical lever lock in the entry/office function, and the Cal-Royal AUS00 is a Grade 3 entrance/office lever with a solid brass forged body for doors 1-3/8 inch to 1-3/4 inch thick. Both give the same operating behavior as the BEST 9K UA, which is Grade 1 and heavy duty. The split is traffic volume and cycle life: a Grade 1 heavy duty chassis is what gets specified on main and high-traffic commercial openings, while Grade 2 and Grade 3 units suit interior offices and low-traffic doors.

11) The opening needs to stay locked at all times with key access only, not an office push button. What lever should be used instead of a BEST 9K UA?

Use a storeroom function lever such as the Hager 2580 Grade 2 storeroom cylindrical lock with the Withnell lever for doors 1-3/8 inch to 2 inch thick, or the Cal-Royal AG05 Grade 2 storeroom lockset with a deadlocking latchbolt for doors 1-3/8 inch to 1-3/4 inch. The BEST 9K UA is an entrance/office function: the outside lever is released by the inside push button or by turning the key, and the inside lever is always unlocked and cannot be locked. A storeroom function keeps the outside lever fixed with entry by key only, which is what a mechanical room, electrical closet, or stockroom is normally specified with.

12) The doors are 1-3/8 inch thick. Which entrance lever fits instead of the BEST 9K UA?

The BEST 9K UA is built for 1-3/4 inch to 2-1/4 inch doors, so on a 1-3/8 inch leaf go to a lock rated down that far. The Hager 2525 is a Grade 2 commercial cylindrical entry lock with a lever for doors 1-3/8 inch to 2 inch, the Cal-Royal AG00 entrance lever is Grade 2 with a 6-pin Schlage C keyway keyed different and a 2-3/8 inch backset for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal AUS00 is a Grade 3 entrance/office lever over the same 1-3/8 inch to 1-3/4 inch range. Note the 2-3/8 inch backset on the AG00 against the 2-3/4 inch standard backset of the 9K UA, so confirm the bore location in the door before ordering.

13) What finish should I order for a hospital or clinic door?

BEST offers 626AM, satin chrome with the UltraShield antimicrobial coating, which inhibits bacterial growth on the hardware surface. It is the finish specified for healthcare, elderly care, food service and transportation. If antimicrobial is not a requirement, plain 626 satin chrome is the standard commercial choice, and the 9K also comes in bright and satin brass (605, 606), bright and satin bronze (611, 612), oil-rubbed bronze (613), bright and satin nickel (618, 619), matte black (622), bright chrome (625) and statuary dark bronze (690).

14) What prep does the door need for a BEST 9K, and does it need through-bolting?

Door and frame prep follows ANSI A115.2. Beyond the standard cylindrical bore you drill two extra 5/16 inch diameter holes at the 12 and 6 o'clock positions for the through-bolt mounting studs. Those through-bolts are what give the lock its torque resistance, so they are not optional on a 9K install.

15) Should I use a cylindrical lockset like the BEST 9K or a mortise lock for an office door?

A cylindrical lock like the 9K bores straight through the door face with a 2-3/4 inch backset and two through-bolt holes, so it installs faster and drops into the prep most commercial doors already carry. A mortise lock needs a pocket routed into the door edge and is what you go to when you need multiple functions in one case or a deadbolt integrated with the latch. For a standard entrance/office opening on a hollow metal or wood door with existing cylindrical prep, the 9K is the direct fit.

16) I need a matching classroom or storeroom lock to go with my entrance/office levers. What are my options?

The 9K is an entrance/office function only, so other functions come from a different part. Across brands, the Dexter C1000 Series covers classroom and classroom security in Grade 1, and asylum function as well. In Grade 2, Cal-Royal offers the AG03 classroom lever on a 2-3/4 inch backset and the AG05 storeroom lever with a deadlocking latchbolt. Mixing brands means mixing keyways, so if you are keying a facility together, stay within one manufacturer's cylinder system.

17) Is the BEST 9K available as an electrified or access control lock?

No. The 9K entrance/office lever is a mechanical lock with no electrified option. If the opening needs to be released from a card reader or access control panel, look at the Corbin Russwin CL33903, a Grade 1 fail safe electrified cylindrical lever running 12V AC/DC for 1-3/4 to 2 inch doors.

18) Will the BEST 9K hold up if someone tries to force the lever?

The chassis is built against that specific attack. Zinc hubs carry a shrouded locking lug for torque resistance, the through-bolt studs at 12 and 6 o'clock resist twisting, and a rose locking pin keeps the assembly from being twisted, bent or broken off. Even if the outside trim is damaged, key access through the cylinder is retained so you are not drilling your way back into the room.

19) Which Grade 1 cylindrical lever locks look like a BEST 9K UA but will not work as a keyed entrance lock?

Several Grade 1 cylindrical levers in the same chassis family are non-keyed and cannot secure an opening. The Falcon K101 is a Grade 1 heavy duty passage lock, fire rated, for doors 1-3/8 inch to 2-1/4 inch, the Falcon T101 is a Grade 1 heavy duty passage lever with pressure release, the Corbin Russwin CL3110 is a Grade 1 vandal resistant passage/closet lever, fire rated, for 1-3/4 inch to 2 inch doors, and the Design Hardware X75 is a Grade 1 passage lever for 1-3/4 inch doors. All of these latch and release only. The BEST 9K UA is keyed with a single cylinder, so it is the one to order when the door has to lock.

20) Can an electrified lever lock be used in place of a BEST 9K UA on an access-controlled opening?

Yes. The Corbin Russwin CL33903 is a Grade 1 fail safe electrified cylindrical lever lock operating on 12VAC/DC for doors 1-3/4 inch to 2 inch thick, offered with the NZ lever and D rose. Fail safe means the outside lever unlocks when power is removed, so the opening follows the access control system and the fire alarm rather than a push button. The BEST 9K UA is mechanical and non-electronic, and is controlled by the inside push button and the key in the outside lever, so it needs no wiring, power supply, or door cord.

21) Is there a keyless lever lock that avoids issuing keys to tenants, as an alternative to the keyed BEST 9K UA?

Yes. The Delaney LP250 is a Grade 2 electronic keypad leverlock, and the Lockey 1150 is a heavy duty mechanical keypad lever set with double combination in the passage function for doors 1-1/8 inch to 2 inch thick, with a version offering an adjustable backset. The Lockey 2835DC is a double combination mechanical keyless lever lock for doors 1 3/16 inch to 2 inch. Access on those is granted by a code rather than a key, so turnover is handled by changing the combination. The BEST 9K UA is keyed with an interchangeable core, which is the route when the door has to sit on an existing master key system.

22) What should be ordered for the inactive leaf or a pull-only door on the same job as a BEST 9K UA?

Use a dummy lever, which mounts a fixed lever with no latch and no chassis. The Accentra 455LN Augusta is a heavy duty Grade 1 single dummy cylindrical lever in the 5400 Series, and the Callan Bentley is a Grade 2 dummy lever. Handed half dummies are available where a single leaf is trimmed, such as the Baldwin Estate 5103 in left hand and right hand versions with the 5048 rose. None of these latch or lock. The BEST 9K UA is a keyed entrance/office lock with a 9/16 inch throw latch and is what goes on the active leaf.

23) For restrooms and patient rooms on the same floor plan as a BEST 9K UA entrance lock, what lever handles those doors?

Those take a privacy or asylum function rather than an entrance/office lock. The Hager 2540 is a Grade 2 privacy cylindrical lock with the Withnell lever for doors 1-3/8 inch to 2 inch. The Arrow MK02-TA is a privacy cylindrical lock, fire rated, with a Tudor knob and no key, for doors 1-3/4 inch to 2 inch. For behavioral health and utility rooms needing key operation from both sides, the Dexter C1000 asylum lock is Grade 1 for doors 1-3/8 inch to 2 inch, and the Arrow MK33-BD-CS is a heavy duty asylum lock with a conventional cylinder in the Schlage C keyway. The 9K UA is single cylinder with the inside lever always unlocked, which is not a privacy arrangement.

24) Is a knob-style entrance lock an acceptable substitute for a BEST 9K UA lever?

It is a different trim decision. The Arrow HK11-BB is a turn-pushbutton entrance cylindrical lock with a ball knob and conventional cylinder for doors 1-3/8 inch to 1-3/4 inch, and the Arrow MK33-BD-CS also uses a ball knob. The BEST 9K UA is a lever, non-handed, offered in contour with angle return, curved with return, and curved without return styles. Lever trim is what gets specified where the opening has to be operable without tight grasping or twisting of the wrist, so a knob is generally not a drop-in for a lever on an accessible route.

25) The building already runs Schlage C keyway cylinders. Does that rule out the BEST 9K UA?

It is the question to settle before ordering. The BEST 9K UA is a single cylinder keyed lock built around an interchangeable core for quick re-keying and master keying. Peers that come cut to a conventional Schlage C keyway include the Cal-Royal AG00 entrance lever with a 6-pin Schlage C cylinder keyed different, the Cal-Royal AG03 classroom lever on the same keyway, and the Arrow MK33-BD-CS with a conventional Schlage C cylinder. Cylinder adapter kits exist for crossing brands, such as the Accentra 107S Schlage cylinder adapter kit for Yale hardware. Match the cylinder platform to the building's existing key system rather than to the lock body.

26) What is the lost motion option on the BEST 9K for?

Lost motion lets the lever rotate about 45 degrees in either direction without engaging the retractor. It is ordered for applications where the lever needs to give under load or side pressure without pulling the latch, so the lever and chassis do not take the abuse. It is an option, not standard, so it has to be called out on the order.

27) The office doors need a passage latch, not a keyed lock. What pairs with a BEST 9K UA on the same floor?

For doors that only need to latch, matching Grade 1 passage levers include the Falcon K101, heavy duty and fire rated for doors 1-3/8 inch to 2-1/4 inch, the Falcon T101 heavy duty passage lever with pressure release, and the Design Hardware X75 for 1-3/4 inch doors. Where Grade 2 is acceptable, the Accentra 5301LN Augusta passage/closet lever in the 5300 Series, the Accentra 4601LN with Augusta trim in the 4600 Series, and the Hager 2510 with the Withnell design for doors 1-3/8 inch to 2 inch cover it. Keeping the passage doors at Grade 1 matches the heavy duty rating of the 9K UA across the floor.

28) Do decorative residential levers work on the same commercial doors as a BEST 9K UA?

They serve a different opening. The Deltana Manchester 6201, Morant 6411, and Linstead 6431 are entry levers for doors 1-3/8 inch to 2 inch thick, and the Kwikset 200BRNL Breton passage and 300BRNL Breton privacy levers are Grade 3 for doors 1-3/8 inch to 1-3/4 inch. The Bravura Atlanta, Orlando, and Tampa passage leversets are Grade 2. The BEST 9K UA is a Grade 1 heavy duty commercial lock with brass and corrosion-treated steel latch and chassis components and through-bolt mounting studs, which is what the traffic on a commercial entrance or office door is specified against.

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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 9K37UA14CSTK626 come with a warranty?

Absolutely. The BEST 9K37UA14CSTK626 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 9K37UA14CSTK626?

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BEST 9K Series Grade 1 Cylindrical Entrance/Office Lock with Keyed Lever

BEST 9K Series Grade 1 Cylindrical Entrance/Office Lock with Keyed Lever