Stanley / BEST 6K37AB Grade 2 Entrance lock

The Stanley BEST 6K37AB is a Grade 2 cylindrical entrance knob lock with the trademark BEST interchangeable core (IC) system, built for light-to-medium-duty commercial and multifamily applications. Function code AB is ANSI F109 entrance function: the outside knob locks by pushing the inside button, key unlocks from outside, and the inside knob is always free for emergency egress. UL listed on 3-hour A-label fire doors. Common spec for apartment unit entries, office tenant doors, interior corridors, school administrative offices, and healthcare non-patient rooms where BEST hardware is already the standing facility spec. 

What Is the BEST 6K37AB Entrance Lock

The 6K is BEST's Grade 2 cylindrical knob line, positioned below the Grade 1 8K Series and the heavy-duty 9K line. BEST (originally Best Lock Corporation, then owned by Stanley Security from 2001 to 2019, now owned by dormakaba) built its reputation on the interchangeable core system: a figure-8 core that drops into every BEST lock, letting a single locksmith re-key an entire building in minutes without removing the locks. That IC compatibility is the reason BEST is the standing spec across thousands of K-12 schools, universities, hospitals, and government buildings. The 6K37AB specifically is the entrance function in the 6K line, which is what most people call a "push-button lock" in everyday language. Push the button on the inside knob to lock the outside, key your way in, and the inside is always free to open.

Stanley BEST 6K37AB Specifications

Full specs for the door schedule:

• Function: ANSI F109 (F81 x F82) Entrance / Office Lock

• Series: BEST 6K Grade 2 Cylindrical Knob

• Grade: ANSI/BHMA A156.2 Series 4000 Grade 2

• Fire rating: UL Listed for 3-hour A-label single doors (4' x 8')

• Case: 2-1/16" diameter cylindrical, fits standard 2-1/8" bore

• Backset: 2-3/4" standard (6K3), 2-3/8" available (6K2)

• Knob: 2" or 2-1/8" diameter brass or bronze, round style standard, tulip available

• Latch: 1/2" throw deadlocking latch, faceplate 2-1/4" x 1-1/8" x 5/32"

• Strike: S3 4-7/8" x 1-1/4" curved lip with box (ANSI A115.2 for 1-3/4" doors) standard

• Door thickness: 1-3/8" to 1-7/8" standard (for thicker doors, spec the heavy-duty 8K or 9K instead)

• Rose: K series, 3" diameter

• Material: brass or bronze component parts, brass or zinc dichromate steel internals

• Handing: field reversible without removing keyed knob

• Core system: BEST IC (Interchangeable Core) compatible, figure-8 small format

• Rekeying: quick rekey via IC core swap (signature BEST feature)

Model Number Breakdown (6K-3-7-AB Decoded)

BEST's model numbering is systematic, which helps with spec matching:

• 6K = 6K Series (Grade 2 cylindrical knob)

• 3 = backset code (3 = 2-3/4", 2 = 2-3/8")

• 7 = rose/trim style

• AB = entrance/office function (ANSI F109)

Full part number with options: 6K37AB4CS3630 (6K + 3 backset + 7 rose + AB function + 4 round knob + C with core + S3 strike + 630 satin stainless finish). If you're matching existing hardware in a building, read the full part number off the back of your current knob and order the same string. If your spec calls for a different function in the 6K line, the last two letters change: D = storeroom, N = passage, L = privacy, R = classroom.

Options, Finishes, and Core Configuration

Configure your 6K37AB at checkout with these options: Core option (accepts BEST IC core with core not included, or with BEST-compatible core plus keys included for; Backset (2-3/4" or 2-3/8"); Knob Style (4 round standard or 6 tulip); Strike (S3 2-3/4" standard or STK 4-7/8" curved); and Finish (630 Satin Stainless Steel standard, 606 Satin Brass , or 605 Bright Brass. If your facility runs a BEST master key system, order with "Accepts BEST IC Core" and your locksmith will cut and install cores from your existing key system for true master key integration.

Where to Buy the Stanley BEST 6K37AB

We've stocked BEST Access Systems hardware since 2001, and the 6K37AB ships the same day from the full BEST 6K Series Grade 2 lineup.