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Bright brass cylindrical knob lock with pushbutton keypad and keyway, unified trim plate, adjustable backset

Simplex

Simplex 1021B-3 Brass US3 Mechanical Knob Pushbutton Combination Door Lock

SKU CH-K5W1-40573 MPN 1021B-3

Mechanical pushbutton combination knob lock for SFIC cores with adjustable 60–70 mm backset and 3-hour fire rating

  • Backset distance2-3/4 in - 2-3/8 in
  • Lock keyingKeyed Different
  • Surface finishBright Brass
  • Sold asBox
  • Mechanical operation removes battery cost and maintenance
  • Single code set at keypad without removing lock
  • Adjustable backset 60 mm or 70 mm fits standard doors
  • Fits door thickness 35 mm to 57 mm wood or metal
  • Three hour UL fire rating on A label doors

Mechanical Combination Lock

The Simplex 1021B-3 is a heavy-duty cylindrical lockset that grants exterior entry through a single pushbutton code while allowing free egress from the inside. It suits commercial and institutional doors where key management is impractical and battery maintenance is unwanted.

Brass Housing With Adjustable Backset

A bright brass US3 finish covers a cast front housing and unified trim plate built for high-traffic use. Fixed ADA-compliant knobs and a 13 mm latch throw install on wood or metal doors 35 mm to 57 mm thick, with the backset adjustable between 60 mm and 70 mm to match existing prep.

SFIC Core Sold Separately

The lock accepts SFIC Best and equivalent 6- or 7-pin cores, so the cylinder must be sourced and keyed before the unit becomes operational. Buyers who need a complete keyed solution out of the box should look elsewhere.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $637.99
Pricier than about 92% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameSimplex
Model name1021B-3
Size & build
Surface finishBright Brass
Backset distance2-3/4 in - 2-3/8 in
More details
Lock keyingKeyed Different

Questions about this item

Does the Simplex 1021B-3 support SFIC Best and equivalent 6 or 7 pin cores?

Yes, the 1021B-3 is built for SFIC Best and equivalent cores in 6 or 7 pin lengths; the core itself is sold separately.

What door thicknesses and backsets does the 1021B-3 fit?

It fits doors 35 to 57 mm thick and adjusts to a 60 mm or 70 mm backset with a 13 mm latch throw.

How is the single access code programmed on the 1021B-3?

The code is set directly on the keypad while the lock stays mounted; no removal or battery work is required.

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