Best 9K37IN-D-S3-626 Interchangeable Core Intruder Lever Lockset

Usually Ships: 1-2 Business Days
  • Extra Heavy Duty, ANSI/BHMA Certified Grade 1
  • ADA Compliant – 3 Hour Fire-Rated
  • Intruder Function – Double keyed, Less Cores (Sold Separately)

Available Options:


The 9K Lock with Intruder Function Can Secure Classroom Doors Simply, Safely and Reliably.

In an emergency, locking classroom doors quickly from the inside is a critical step in protecting children and staff. The BEST 9K lock is a classroom lock with a visual indicator that shows which way to turn the key to ensure the door is securely locked. This simple, yet significant, marker can make a big difference when every minute counts. Mechanical locks like the 9K are an integral part of a comprehensive security strategy, and are also a cost-effective answer to the ongoing demand to make schools and classrooms more secure.

Intruder (IN) – ANSI Function F11

Visual Lockdown Indicator – Easy-to-understand marking on classroom side of lock shows which way to turn the key to lock the door from the inside of the classroom.

Pre-assembled heavy-duty chassis – Out of the box and onto the door, the 9K offers quick and easy installation.

Cast construction lock hub – Protects the lock’s critical components from everyday use and abuse.

Hardened steel through-bolt studs – Deliver maximum lever torque resistance that stands up to the hardiest hands.

Proven quality – Tested to exceed 10 times the BHMA Grade 1 criteria by UL.



Heavy Duty

Lever Design

14 Lever (Curved, Return), 15 Lever (Contour Angle, Return)

Lock Function


ANSI/BHMA Standard

Listed by BHMA for A156.2, Series 4000, Grade 1

Fire Rating

Listed by Underwriters Laboratories for use on 3 Hr, A label for single or double swinging doors

ADA Compliance

Meets ADA requirements – A117.1 Accessibility Code


Requires 2 Cores – Not Included (Sold Separately)


2-3/4" standard


S3: Conforms to ANSI A115.2 for 1 3/4” doors (4 7/8” x 1 1/4” with curved lip).


D – 3 1/2” Convex



Door Thickness

1-3/4" to 2-1/4"

Buy American Act Compliance

Meets Buy Amercian Act – Made in USA


626 Satin Chrome


1/2” throw, deadlocking – 1-1/8" x 2-1/4" face

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Best 9K37IN-D-S3-626 Interchangeable Core Intruder Lever Lockset