Dormakaba Simplex 1021B-26D-LO Pushbutton Lock - Satin Chrome W/ Lockout

The Dormakaba Simplex 1021B-26D LO is a mechanical pushbutton cylindrical knob lock from the Simplex 1000 Series Knob Lock platform, the entry-level configuration in Dormakaba's volume-leading mechanical pushbutton catalog. The full part number breaks down as: 10 (Simplex 1000 Series), 21 (combination entry only, no key override, no passage), B (knob trim), 26D (US26D Satin Chrome finish), LO (Lockout option). This is the simplest configuration in the entire Simplex catalog and the right choice for openings that need keyless code-based entry without the cost or complexity of key override, passage option, or interior combination change. No batteries, no wiring, no electronics purely mechanical. UL Listed for 3-hour fire-rated A-label single doors. Non-handed (fits left or right hand doors). SKU 1021B-26D-LO. In stock under Mechanical Pushbutton Locks within Keypad/Prox Locks.

Dormakaba Cylindrical Locks with Keypad Trim: Where the 1021B Fits

Dormakaba's mechanical pushbutton catalog covers cylindrical locks with keypad trim across two main series and a 4-configuration matrix within each. The Simplex 1000 Series is the entry-level catalog (1011 lever, 1021 knob, 1031 knob with key override, 1041 with passage option, 1051 with passage and key override). The Simplex 5000 Series is the heavy-duty institutional catalog with extra heavy-duty cast stainless steel internal drive parts and clutch-free direct-drive design (5021/5031/5041/5051 same configuration matrix). The 1021B specifically is the basic combination-entry-only knob configuration with no key override and no passage feature. If your spec needs a key override for emergency access, look at the 1031 instead. If your spec needs a passage option for unrestricted entry during specific hours, look at the 1041 or 1051. If your spec needs heavy-duty institutional duty-cycle hardware, step up to the Simplex 5000 Series Lever Lock.

How the 1021B Operates

Five vandal-resistant mechanical pushbuttons (1 through 5) plus an Enter button. The factory-set combination is changed at first installation using the combination change tool from the lock interior. Press the code, turn the outside knob, latch retracts. Inside knob always retracts the latch (free egress). One combination code per lock made of any combination of one to five numbers, pressed individually or simultaneously, producing thousands of possible combinations. The 1021B has no key override (this is the differentiator from the 1031 and 1051 SKUs), so emergency access is via combination only. The LO Lockout feature allows the lock to be deactivated entirely via a slide bolt that disables the combination requirement, providing unrestricted free passage during designated periods (useful for office hours, school class periods, or shift changes).

Specifications

Construction: extruded brass and stainless steel housing, solid cast brass or stainless steel components, vandal-resistant numeric pushbuttons. Backset: 2-3/4" standard. Latch: 1/2" throw with floating face plate, or 3/4" throw with beveled faceplate. Door thickness: 1-3/4" standard. Handing: non-handed, field reversible. Operation modes: combination entry only (no key override). Code: one combination of one to five buttons, thousands of possible combinations. Lockout (LO) feature: slide bolt disables combination requirement for free passage during designated periods. Trim: B knob style. Compliance: UL Listed for 3-hour fire-rated A-label single doors.

Where to Specify the 1021B

IT and server rooms in commercial environments where keyless entry is needed without key management overhead, multi-tenant building common areas, healthcare facility staff-only zones, school administrative offices, office break rooms and supply closets, mechanical and electrical rooms, low-to-medium-security commercial entries, sports facility and gym back-of-house, hotel staff areas, and any commercial opening that needs simple code-based entry without keys, batteries, or wiring. The Lockout option specifically suits openings that need scheduled free passage during business hours, school periods, or shift changes.

Where the 1021B Sits in the Simplex Family

Sister Simplex 1000 Series configurations on the same chassis: 1011 lever trim with combination entry only, 1031 knob with key override, 1041 with passage option, 1051 with passage and key override. For lever trim instead of knob, see Simplex L1000 Series Lever Lock. For heavy-duty institutional duty cycles, step up to the Simplex 5000 Series Lever Lock. For mortise architecture, see Simplex 8100 Mortise Lock. For exit trim configurations on panic exit devices, see Simplex LP1000 Exit Trim. For double-sided combination entry on both sides of the door, see Simplex EE1000 Double Sided Lock.

Where This Sits in the Site Catalog

The Simplex 1021B-26D-LO lives under Simplex 1000 Series Knob Lock in Mechanical Pushbutton Locks with Keypad/Prox Locks. For other Dormakaba electronic and electromechanical lock platforms, see Dormakaba Electric Keypad/Proximity Locks and Kaba Mas.