Best 9K37R-D-S3 Interchangeable Core Classroom Lever Lockset

Usually Ships: 3-5 Days
  • Extra Heavy Duty – ANSI/BHMA Grade 1
  • ADA Compliant – 3 Hour Fire-Rated
  • Classroom Function – Less Core (Sold Separately)

Available Options:

  • Dark Bronze
  • Satin Chrome

Best 9K Series Heavy-Duty Cylindrical Lock – The premium lock for quality, performance, and security

Building on BEST’s legacy of innovation, the 9K series cylindrical lock combines top-quality materials and exceptional craftsmanship into a tough, dependable, long-lasting security solution. The 9K series was designed to be low maintenance, easy to install, durable, and secure.

Classroom (R) – ANSI Function F84

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.



613 Oil Rubbed Bronze, 626 Satin Chrome

Lever Design

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

Lock Function



Heavy Duty

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



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


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

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