About this item
The BEST 9K37B is a Grade 1 office function cylindrical lever lock from BEST's 9K Series heavy duty platform -7-pin SFIC housing, push button inside control, key outside access, UL listed for 3-hour fire doors, ADA compliant, and through-bolt mounted for maximum torque resistance. American Locksets stocks the 9K37B. Free shipping on orders over $300.
What the Office Function Lever Lock Does
The office function is one of the most specified cylindrical lock functions in commercial buildings, and understanding exactly how it works matters before you commit to a door schedule.
Here's the full operation of the BEST 9K37B:
The latch retracts freely from inside by turning the lever -always, with no keys and no codes. The inside lever cannot be locked. From outside, the lever retracts the latch only when the inside push button is in the out (unlocked) position. Push the inside button in and the outside lever locks rigid -a key in the outside lever is now the only way to retract the latch from outside. Rotating the inside lever or turning the key from outside releases the push button and returns the outside lever to normal operation. Critically: closing the door does not release the push button. Once the button is engaged, it stays engaged until actively released from inside or by key from outside.
This is exactly right for private offices, executive suites, and any interior commercial door where the occupant needs on-demand privacy control without a separate deadbolt. One push of the inside button secures the door. Inside lever always provides immediate egress. Key outside for authorized entry.
Why the BEST 9K Is the Grade 1 Lever Lock Standard
The 9K Series has been on institutional hardware schedules at universities, hospitals, government buildings, and school districts across North America for decades. It doesn't hold that position because of branding -it holds it because of construction details that prevent the failure modes that standard Grade 1 locks can't resist.
The rose locking pin and rose assembly are engineered to resist torsion attack -the pin itself can't twist, bend, or break under forced rotation. The slotted key release cam and locking lug assembly create attack resistance at the cylinder interface specifically: even if the outside trim is damaged during a forced entry attempt, key access still works and the inside lever remains fully functional. The outside lever sleeve is a seamless one-piece hardened steel alloy construction -no seam in the locking lug area where prying attacks focus. Hub-mounted torsion spring and strong retractor springs keep the lever from sagging under years of high-cycle commercial use. Zinc hubs with a shrouded locking lug add another layer of torque resistance at the point where most leverage attacks concentrate.
Through-bolt mounting is standard and non-optional on the 9K37B -two 5/16-inch holes at 12 o'clock and 6 o'clock positions plus the standard ANSI A115.2 door prep. That through-bolting anchors the rose assembly across the full door thickness, eliminating the leverage that surface-mounted rose screws alone can't resist.
Specifications
Model: BEST 9K37B
Series: 9K Heavy Duty Grade 1 Cylindrical Lever Lock
Function: Office (B) -Inside push button locks outside lever. Inside lever always free. Key from outside releases and retracts latch. Push button does not release on door closing.
Cylinder Housing: 7-pin SFIC -ships less core, accepts all BEST interchangeable cores
Backset: 2-3/4" standard. Also available in 3-3/4" and 5".
Chassis: 2-1/16" diameter for 2-1/8" door hole. Brass and corrosion-treated steel critical components. Conforms to ANSI A115.2.
Latch: Solid brass, 9/16" throw. Front 2-1/4" x 1-1/8" beveled.
Door Thickness: 1-3/4" to 2-1/4" standard. Spacers available for 1-3/8" doors.
Strike: S3, conforms to ANSI A115.2 for 1-3/4" doors. 4-7/8" x 1-1/4" curved lip.
Mounting: Standard ANSI A115.2 prep plus two 5/16" through-bolt holes at 12 and 6 o'clock positions.
Lever: High-quality zinc alloy, ~5/8" body diameter, ~4-3/4" handle length.
Rose Options: C (3" convex), D (3-1/2" convex), K (3" convex, no ring), L (3-1/2" convex, no ring)
Projection: Approximately 2-3/4" when mounted on 1-3/4" door.
Options: Lost Motion feature (45° lever rotation without engaging retractor). UltraShield antimicrobial finish (626AM). CORMAX key system.
Certifications: BHMA A156.2 Series 4000 Grade 1. UL listed 3-hour A label, single or double swinging doors. ADA compliant per ANSI A117.1 section 404.2.6. Florida Building Code listed. California State Fire Marshal listed. California Title 24 compliant (levers 14 and 15).
The Full 9K Series for Office Door Schedules
The 9K37B office function is the right spec for private offices and interior commercial doors with on-demand privacy control. If your door schedule includes other functions, the 9K platform covers every standard institutional need: entrance (AB), classroom (A), storeroom (D), communicating (S), dormitory/bedroom (T), hospital privacy (H), and more. Every function uses the same chassis, mounting prep, and SFIC core format -one key system across the entire building, consistent lever style and finish throughout.
American Locksets has stocked BEST 9K Series hardware since 2001.
Trusted Since 2001
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