Simplex LD451

Pushbutton Door Knob Lock

Reviews (2) | Customer Questions (2)


Save the day with this all mechanical pushbutton doorknob from Kaba. How many times have you or someone in your family forgotten their keys? The Simplex lock is your answer. A few punches on the keypad and you’re inside. Great for securing exterior back doors, and master bedroom doors.

In stock

SKU: LD4513532D41
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For more information or ordering assistance, please call our Residential Product Specialists at 877-439-5377 ext 9005

  • Light-duty, cost-effective cylindrical access lock
  • Satin stainless (32D) (630) finish
  • Supports one (1) single access PIN code
  • Pass-code can be 3-7 characters in length.  Over 8000 possible combinations
  • Smartly designed for wood and metal swing doors
  • Auto-locking with latch holdback (you can remove the latch hold-open feature easily in the field)
  • Simple programming of your access code via keypad once lock is removed from the door
  • Swift do-it-yourself installation with easy to follow instructions and full scale mounting template
  • Two 2 1/2″ x 8″ cover trim plates and two 2″ gaskets supplied.  Cover plates for retrofitting 2 1/8″ bore (door hole) left from existing door knob or lever locks
  • No Battery; fully mechanical
  • Backset:  2 3/8″  How do I measure?  (Click here for this same lock with 2 3/4″ backset)
  • Vandal resistant
  • 1-year manufacturer warranty

GoKeyless™ is a factory trained and authorized Kaba Simplex® dealer. Sales, service, support, valid warranties. It's why thousands of clients around the world choose GoKeyless™ for their security and access control needs each year. Turn your home, small office, and other light traffic doors keyless with this upscale new keypad lock by Kaba Access.  At a price where you want it, the new Simplex LD450 series allows you to manage your day's business instead of managing keys.  You may have cheated losing your keys or the accidental "I locked myself out!" up to now, but why leave it to chance any longer.  For less than half the cost of an iPod or internet-enabled phone, you can have this light-duty, wire and cable free keyless lock on your door in minutes.  You'll never have to worry about whether you remembered your keys ever again!  Don't be fooled by similar looking locks at a cheaper price.  Some companies may claim to be offering you a lock, and rightly so, but is it a secure locking device. Cheap knock-off locks can be compromised with the right know-how.  This one by Kaba easily passes the test in durability, and reliability.  The inside and outside housings, as well as the knob, are solid cast.  The pushbuttons are all metal.  These are important construction concerns for long-term operability, and for installing the lock on a perimeter door, shed door, or any outside entryway that may be impacted by weather.  The LD450 endures.
Exterior Dimensions

2 (W) x 6 1/16 (H) x 2 3/16 (D) in. (without trim plate)

Inside Dimensions

2 (W) x 6 1/16 (H) x 2 1/8 (D) in. (without trim plate)

Door Thickness Minimum

1 3/8 in.

Door Thickness Maximum

2 1/2 in.

Code Length

3 to 7 Digits

Code Capacity




Door Handing


Door Prep

Standard 2 1/8 in. Cross-Bore, Edge Bore: 1 in., Through-Bolt Hole(s)

Door Stile Width

Minimum 3 in.


Cast knob, Solid cast housings

Access Type

Keypad – Digits

Lock Features

Passage Mode

Door Opening


Locking Device

Cylindrical Latch

Handle Type

Lever Handle Door Locks




Kaba Simplex


2 3/8 in.


4 lbs


1 Year Manufacturer

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5 out of 5 stars

2 reviews

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What others are saying

  1. Awesome lock

    J (verified owner)

    We used similar locks on our ship in the Navy, so I already knew it would be robust and easy to use. Can’t go wrong with these. Perfect for keeping kids out of my bouldering climbing gym when I can’t be up there to supervise.

    (0) (0)

    Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

  2. Jose from Texas

    Good product and better service!

    (0) (0)

    Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...




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Customer Questions & Answers

  1. A

    The interior is a lever. The exterior is a knob. 

  2. A
    This lock would be right at the maximum size. For something that narrow we would recommend the M230 and for a gate if they can reach over the M230DC which is double sided to stop reaching over openings. 

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