Dormakaba Simplex LD450 Series...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$167.00
$118.02
Dormakaba Dormakaba Simplex LD450 Series Light Duty Pushbutton Knob Lock, Latch Holdback DOR-LD450

Dormakaba Simplex LD450 Series Light Duty Pushbutton Knob Lock, Latch Holdback

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Model: LD452-35-05-41
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$167.00
$118.02
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Simplex Mechanical Pushbutton Locks eliminate problems and costs associated with issuing, controlling, and collecting keys and cards.

The Simplex 450 Series mechanical pushbutton locks provides exterior access by combination. This fully mechanical lock eliminates the material and labor expense of battery replacements, has a single access-code and is programmed via the keypad without removing the lock from the door.

Product details

No Battery: Fully mechanical lock eliminates the material and labor expense of battery replacements

Locking Device: Tubular latch

Number of Codes: Single access code (non-sequential)—one easy-to-manage code for all users

Programming: Lock is easily programmed via keypad once removed from door

Handing: Pre-assembled for right-hand door installations (easily changed in field)

Operation Modes:

  • Pushbutton Access
  • Latch Holdback (easily removed in field)

Economical: A cost effective access control solution

Key Override: Not available

Construction: Solid cast housings; cast knobs and levers

Numeric Keypad: Vandal resistant, metal pushbuttons

Handing: Non-handed, pre-assembled for right-hand door installations (easily changed in field)

Finishes: Satin Stainless 32D (630), Bright Brass (03), Antique Brass (05) housings and knobs/levers

Backset: 2¾" (70 mm) backset, 2���������" (66 mm) backset

Latch: ½" (51 mm) latch

Door Preparation: Easily installs on wood or metal doors. Requires four holes (two for through bolts, one for latch spindle, and one for latch support post).

Door Thickness: 1��������� " (35 mm) to 2½ " (64 mm)

Supplies Included: Lock assembly, installation manual, template, and required hardware; as well as two 2½" (64 mm) x 8" (203 mm) cover plates and two 2" (51 mm) gaskets

Warranty: 1-year warranty

Manufacturer Resources

Product Specs

Product Group:
Mechanical Locks
Series:
Simplex LD450 Series
Grade:
Grade 1
Product Subgroup:
Bored Locksets
Product Type:
Simplex Mechanical Push Buttons Locks
Subcategory:
Push Buttons Locks
Commercial/Residential:
Commercial
Latch Throw:
1/2"
Duty Level:
Light Duty
Handle Type:
Knob
Lock Type:
Cylindrical
Segment:
Door Hardware
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/8" to 2-1/2"
Product Category:
Mechanical Locks
Backset (Distance):
2-3/8" or 2-3/4"
Department:
Door Hardware

Dormakaba LD452-35-05-41 – Frequently Asked Questions

1) Will the Dormakaba Simplex LD450 pushbutton knob lock fit my door thickness and backset?
The LD450 covers doors from 1-3/8 to 2-1/2 inches thick, which takes in standard 1-3/4 inch commercial doors as well as thinner older interior doors and thicker custom slabs. Order it to match the bore you already have: it comes in both a 2-3/8 inch and a 2-3/4 inch backset. Measure from the door edge to the center of the existing knob hole before you pick, since the two are not interchangeable once the prep is cut.
2) Does the Simplex LD450 have a key override if someone forgets the code?
No key cylinder on the LD450. It is combination access only, with a single non-sequential code shared by all users, so there is no keyed way in if the code is lost. For a tenant-facing or public entrance where a manager needs a bypass, that is the deciding limitation, and you should be looking at a Simplex model with a key override instead. Where it works well is a back-of-house, storage, or staff door where losing key control is the bigger problem than being locked out.
3) Is the Simplex LD450 mechanical lock battery powered, and does it need wiring?
Neither. The LD450 is fully mechanical: no batteries, no power, no wiring to the opening. The code is entered on a vandal resistant metal pushbutton keypad and the whole assembly runs on solid cast housings with cast knobs. For a property manager running dozens of openings, that means no battery replacement program and no dead lock on a cold morning, which is the usual reason to pick a mechanical pushbutton over an electronic keypad.
4) Do I have to order a left hand or right hand Dormakaba LD450?
Handing is not an ordering decision here. The LD450 is non-handed and field reversible; it ships pre-assembled for a right hand door and the installer changes it over on site. Order the backset and finish you need and one part number covers either swing.
5) Will the Simplex LD450 latch into the strike that is already in my frame?
The LD450 uses a tubular latch with a 1/2 inch throw, which is standard cylindrical latch geometry and will engage a normal ANSI cylindrical strike in a wood or hollow metal frame. What decides it is the backset: match the 2-3/8 or 2-3/4 inch version to the existing bore and the latch lines up with the existing strike pocket. If the old lock was a mortise or a deadlatch with a deeper throw, the frame prep is different and this will not drop in.
6) What does the latch holdback feature on the LD450 actually do?
Latch holdback lets you hold the latch retracted so the door stays in a free-entry state, useful for a shop, office, or common room that should be open during business hours and locked after. On the LD450 the holdback function can be removed in the field if you decide you do not want anyone able to leave the opening unsecured, so the same lock covers both policies.
7) Is the LD450 rated for a commercial door, and is it strong enough for heavy traffic?
It is a Grade 1 commercial cylindrical lockset, but it is built as a light duty product within the Simplex line. That combination suits a moderate-traffic staff, storage, or back office door rather than a main entrance cycling hundreds of times a day. For a high-use opening, step up to a heavier duty Simplex pushbutton lock.
8) How many codes can the Simplex LD450 hold, and can I give each tenant their own?
One code, shared. The LD450 carries a single non-sequential access code for all users, so it is not the lock for per-tenant or per-employee credentials or for any kind of audit trail. What it does solve is key control: when someone leaves, you change the one code instead of rekeying cylinders and collecting keys.
9) Does the Dormakaba LD450 come with a lever instead of a knob?
The LD450 as configured is a knob lock, with the pushbutton keypad on the exterior. If your facility standardizes on levers for accessibility or you are matching lever trim elsewhere in the building, this is not the part; look for the lever version of the Simplex 450 family instead.
10) What finishes does the Simplex LD450 knob lock come in, and can I match the rest of my openings?
Three finishes across the range: 605 bright brass, 609 antique brass, and 630 satin stainless. Each is offered in both the 2-3/8 and the 2-3/4 inch backset, so finish and backset are independent choices. Satin stainless 630 is the one to pick if the rest of the building is on standard commercial hardware.
How fast can I get the Dormakaba LD452-35-05-41 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Dormakaba LD452-35-05-41 come with a warranty?
Absolutely. The Dormakaba LD452-35-05-41 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Dormakaba LD452-35-05-41?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Dormakaba LD452-35-05-41 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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