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$19.99
0.0002313BTC
In stock
Simplex
Simplex 1021C-3 Brass US3 Mechanical Knob Pushbutton Combination Door Lock
Mechanical pushbutton combination knob lock with adjustable backset and three-hour fire rating for doors 35 to 57 mm thick
- FinishBright Brass
- Selling UnitBox
- Backset2-3/4" - 2-3/8"
- KeyingKeyed Different
- Mechanical entry removes battery cost and labour
- Single code programmed at keypad without door removal
- 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 knob combination lock
The Simplex 1021C-3 is a heavy-duty cylindrical lock with a pushbutton keypad that grants exterior access by code while allowing free egress. It is built for doors 35 to 57 mm thick and accepts LFIC Corbin Russwin 6-pin length cores, which are sold separately. The brass US3 finish suits commercial and institutional settings that prefer a mechanical solution over electronic alternatives.
Adjustable backset and fire-rated latch
The lock ships with an adjustable backset covering 60 mm and 70 mm positions and a 13 mm latch throw, so one unit fits both common door preparations without extra parts. A unified trim plate and cast front housing add rigidity, and the assembly carries a three-hour UL/ULC fire rating on "A" label doors, removing the need for separate fire-rated hardware in many installations.
Surface mounting with template alignment
Installation follows a standard cylindrical prep: drill the face bore and edge bore, mount the latch, then secure the through-bolts and unified trim. The single access code is programmed at the keypad without removing the lock from the door. The most common issue is misaligned latch engagement caused by an incorrect backset selection or an off-centre face bore; verifying the 60 mm or 70 mm setting against the door prep before tightening prevents callbacks.
Highlights
- Mechanical entry removes battery cost and labour
- Single code programmed at keypad without door removal
- 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
Specifications
| Brand | Simplex |
|---|---|
| Model | 1021C-3 |
| Finish | Bright Brass |
| Selling Unit | Box |
| Backset | 2-3/4" - 2-3/8" |
| Keying | Keyed Different |
Questions about this item
Does the 1021C-3 need batteries or any other consumable part replaced over time?
No, the lock is fully mechanical so there are no batteries, capacitors or electronic modules to service or replace during its service life.
What stops me from entering codes continuously on the pushbutton face of the 1021C-3 during a busy period?
The mechanical tumblers and spring return limit how fast the buttons can be cycled; sustained rapid entry will slow naturally as the mechanism resets between each press.
How much heat or noise does the 1021C-3 produce when the knob is turned repeatedly all day?
The lock generates no measurable heat and only the faint click of the latch bolt and tumbler return, both well below levels that would be noticed in a corridor.
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