Dormakaba 204205-26D-01 Simplex Back Plate Assembly - Left Hand - Satin Chrome

The Dormakaba 204205-26D-01 is a genuine Simplex back plate assembly for the L1000 Series mechanical pushbutton lever lock, in a left-hand configuration and satin chrome (26D) finish. The back plate is the interior-side mounting plate of the lock, it sits on the inside face of the door and anchors the lock body, carrying the inside lever and trim. When the back plate on an L1000 lock is damaged, corroded, or worn, this is the factory replacement part that restores it, matched to the door hand and finish. It's a real dormakaba component, not a generic substitute, so it fits and functions exactly as the original.

What the back plate does on a Simplex L1000

It helps to understand where this part fits. The Simplex L1000 is a fully mechanical pushbutton cylindrical lever lock, no batteries, no wiring, no power of any kind. It grants exterior access by combination code and keeps the interior lever free for egress at all times. The lock clamps to the door between an outside housing and an inside back plate, and the back plate assembly is the inside-face component that mounts the lock and supports the inside lever and trim plate. Because it's a structural mounting part, a cracked, bent, or corroded back plate compromises how the whole lock sits on the door, which is why replacing it with the correct assembly matters.

This part is handed. The 204205-26D-01 is the left-hand version, and a handed part is not interchangeable between left-hand and right-hand doors, so the hand has to match your door for the lever and mechanism to seat correctly.

Genuine dormakaba replacement, finish and hand specific

Simplex parts are specific by both finish and hand, and ordering the right combination is the whole job. The 204205-26D-01 is the satin chrome (26D) finish in the left-hand configuration. A different finish or the opposite hand carries a different part number, so the 204205-26D-01 is the exact part for an L1000 that is left-hand and finished in 26D satin chrome. Using the genuine dormakaba assembly keeps the lock within its UL listing and original fit, which a non-factory part can not guarantee.

Dormakaba 204205-26D-01 specifications

• Type: Simplex back plate assembly (interior mounting plate), genuine dormakaba replacement part.

• Fits: dormakaba Simplex L1000 Series mechanical pushbutton lever locks.

• Hand: Left hand (handed part, not interchangeable with right hand).

• Finish: 26D satin chrome.

• Part number: 204205-26D-01.

• Lock type served: Mechanical pushbutton cylindrical lever lock (no battery, no wiring), combination entry with free interior egress.

Why order the genuine 204205-26D-01

For a Simplex L1000 that needs a back plate replacement, the genuine dormakaba 204205-26D-01 is the correct part for a left-hand, satin chrome lock. A factory assembly guarantees the fit, finish match, and proper seating that keeps the lock operating and within its original listing, which is exactly what you want when servicing access-controlled hardware. Sourcing the matched part number by hand and finish avoids the most common repair mistake, ordering a part that won't seat because the hand or finish is wrong.

One thing to confirm before ordering: this is the left-hand, 26D satin chrome version. Verify your L1000's door hand and finish before you order, because the back plate is handed and finish-specific, the opposite hand or another finish is a different part number. If you are not certain of your lock's hand, we can help you identify it.

Order the Dormakaba 204205-26D-01 from American Locksets

We stock the full dormakaba Simplex L1000 parts catalog as an authorized dormakaba dealer, so every part is genuine and ships with the manufacturer warranty. Find related components in the dormakaba L1000 Series mechanical lever lock parts category, or browse all keypad and prox locks.