Best Sliding Window Lock — The Only List You’ll Need

Best Sliding Window Lock

Our top pick when it comes to the best sliding window lock is the Defender Security U 9809 Sliding Window Lock. It can be easily installed, and can even be used as a secondary lock. Additionally, it’s made from a strong, thick material that’s built to last.

The Short Version


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The top adhesive sliding window lock is the Ofun model. It’s made from a plastic material with a premium acrylic adhesive and is also built to be safe and durable.

Moreover, the lock also comes with a handy 12-month warranty, as well as a 30 money-back guarantee.


Setup: The Ofun window lock is pretty simple to set up with its adhesive.

Design: This model also features a unique design with its diamond-like cover and 12 position recline.

Warranty: Lastly, this window lock also comes with a 12 months warranty, as well as a 30-day money-back policy in case of any issues.


Plastic: The lock itself is made from a not so strong plastic material.

Breakable: If enough force is applied, the lock can be breakable.


Burglabar 2 Pack - Great for Sliding Patio Door Lock, (Use 2 for doors) for Basement Windows,Child Safety
  • Door & window locks: The Burglabar is a unique self-locking hinge lock designed to offer additional home security from a patio door or sliding window. Our sliding glass door lock and window lock keeps you safe and can be used to child proof your home.
  • Safety at home: Our window and door latch lock provides additional safety while you are home and keeps your home safe when you are not. The Burglabar is also a great door safety lock for kids keeping your little explorers safely inside.
  • No tools needed: Our Burglabar installs quickly and easily without tools and its crystal-clear design blends in with your decor. When mounted out of reach from small children the BurglaBar keeps windows and doors shut for child safety. Read instructions to make sure that you have the space between both sliding doors for the Burglabar to fit.
  • Incredible strength: Proudly made in Canada, Burglabar’s adhesive bonds like a weld for maximum strength. Each Burglabar, when properly applied, can withstand dynamic shear of 300 to 450 pounds. We recommend using 2 Burglabars for sliding doors. Please leave for 72 hours to let adhesive stick properly to the glass before using.
  • Who we are: We are Rishon Enterprises Inc., the creators of The Original Addalock and the Burglabar. We have focused our time and efforts on promoting and bringing attention to safety, security and privacy for your everyday life.

Last update on 2023-09-22 at 09:01 / Affiliate links / Images from Amazon Product Advertising API

The top multipurpose lock is the Burglabar. This handy lock comes in a package with two and is designed for sliding patio doors, windows or normal doors.

In addition to that, it also sports a unique, transparent design and is pretty easy to install and adjust,


Adjustable: This model is easy to adjust for your convenience.

Transparent: Additionally, this lock also comes in a unique, transparent style.

Install: The Burglabar is also pretty easy to install using the adhesive.

Self-Locking: Lastly, the window lock also comes with a useful,self-locking hinge.


Adhesive: The adhesive may cause some damage to surfaces.

Plastic: Since its made of plastic, it may be a little less durable than other brands.

Lion Locks

Sliding Window and Door Locks (10 Pack), Adjustable Aluminum, used for 3/16-3/8” Track, Security Door Stopper Safety Lock, No-Drill Install, Requires 28-36mm Clearance for Screw Lock
  • SLIDING TRACK LOCK: Secure your patio door, sliding glass door, and both horizontal & Vertical sliding windows. Ideal for securing a vertical window air conditioner or window fan setup.
  • DURABLE & SENSIBLE: Made of heavy-duty aluminum the lock includes a vinyl lining to prevent you from scratching your window frame. The vinyl insert provides additional gripping power when locking your windows down.
  • NO TOOLS NEEDED: These window locks are easy to install with double door lock thumb screws securing sliding door & window tracks up to 3/16" wide with the rubber insert or 3/8" without the rubber window seal.
  • CHILD PROOF DOOR LOCK: Use this window lock to protect your family from intruders and more! The sliding door lock allows you to leave sliding windows & doors securely locked in position, whether fully closed or ajar to allow a breeze.
  • WINDOW LOCKS SECURITY: Whether you are looking for a way to lock in an AC unit window setup, as a camper lock replacement, or as part of your babyproofing house setup.

Last update on 2023-09-22 at 09:01 / Affiliate links / Images from Amazon Product Advertising API

Our most durable sliding lock has to the Lion Locks model. It offers heavy-duty, aluminum construction and additional gripping power, ensuring that the windows and sliding doors are securely locked.

In addition to that, the locks come in a pack of 10 at an affordable price too.


Thumbscrews: The two thumbscrews included allow you to adjust where the lock should be.

10 Locks: You get 10 locks in a single pack.

Lining: The lock’s vinyl lining provides an easier and improved grip.

Material: Since this model sports a strong aluminum build, you can rest assured that it’s built to last.

Price: Lastly, it also comes at an affordable price.


Thumbscrews: The only downside is that the thumbscrews are very small.


Sliding Door Lock Child Safety - Closet, Glass Doors, Patio, Window Locks, No Drill Easy Install, 4 Pack, Clear
  • Easy Install Child Safety Lock for Sliding Doors with Pre-applied Double-sided Adhesive. No Tools Or Drilling Needed
  • One-hand Use Sliding Glass Door Lock, Simply Lift Both Side Wings To Lock And Simply Fold Down Again To Unlock
  • No More Access To Your Clothes In The Wardrobe. Reliable Pet & Baby Proofing Child Safety Lock For Sliding Doors.
  • Sliding Closet Door Lock Either Limits Or Completely Stops To Prevent Kids Or Pets From Opening Doors
  • Strong Abs BPA Free Plastic Sliding Window Locks, Sticks To All Surfaces, Glass, Aluminum, Wood, Plastic

Last update on 2023-09-22 at 19:55 / Affiliate links / Images from Amazon Product Advertising API

The 3M Sliding Lock is a good option for childproofing your windows and sliding doors. It can also secure sliding closet doors, and is easy to install using the 3M adhesive, no tools required.

Additionally, it’s pretty easy to lock and unlock and features a unique transparent style.


Design: Its transparent design makes it unique and aesthetic.

Versatile: This sliding lock can be used in many areas, such as both horizontal and vertical windows, sliding doors and closet doors too.

Price: It comes at an affordable price too.

Simple: The 3M Sliding Lock is very easy to install using the adhesive, and the lock itself is simple to operate too.


Plastic: The lock is made from plastic material, which isn’t very durable.

Adhesive: The adhesive may damage some surfaces.

Maxdot Sliding

Maxdot Sliding Window Locks Adjustable Security Window Lock Window Stoppers Aluminum with Key Childproof Safety Window Lock Clamps for Vertical Horizontal Slide Door Windows(4 Sets)
  • Size: volume approx. 3 x 2.4 x 2.4 cm/ 1.18 x 0.94 x 0.94 inch (LWH), apply to track heights more than 1.5 cm/ 0.6 inch, track thickness no greater than 1.6 cm/ 0.63 inch (This product is suitable for the window type with track, please carefully confirm the window type and specific size before purchase.)
  • Easy to install: there is no need to install extra tools, it equips a hex key in each window locks, holding on the track by key control
  • Durable material: it is strong, solid and sturdy, exquisite workmanship, aluminum alloy frame and stainless steel screws that can be reused many times
  • Wide usage: can be easily applied to most environments; By keeping the windows partially open and closed, the burglar-proof and thieves can prevent children from falling and protect the safety of their families while improving air circulation
  • Quantity: 4 pieces sliding window locks with keys; Note: multiple locks can be apply to heavy doors or windows to increase safety

Last update on 2023-09-22 at 09:01 / Affiliate links / Images from Amazon Product Advertising API

The most budget-friendly lock on our list today is the Maxdot Sliding model.

The Maxdot Sliding lock is easy to install and comes with a durable, long-lasting aluminum frame. It also features detachable key-inserts and stainless steel screws.


Sliding Doors: The Maxdot Sliding lock can be used on both doors and windows.

Price: The model is also budget-friendly.

Frame: The frame is made from a strong aluminum alloy material, while the key is of stainless steel.

Key Inserts: The thumbscrews are key like structures for easy opening and closing of the lock.

Screws: Lastly, the screws provided are stainless steel for extra durability.


Inserts: The key inserts are a little bit big.

Defender U 9819

Defender Security U 9819 Aluminum, Sliding Window Security Lock (4 Pack),Silver
  • Used to secure sliding window in a closed or ventilating position
  • Thumb turn screw secures lock in place
  • Fits up to 1/8 inch thick rails
  • Extruded aluminum construction
  • Easy to install

Last update on 2023-09-22 at 09:01 / Affiliate links / Images from Amazon Product Advertising API

The best sliding lock with a knob is the Defender Security 9819. The quality of the lock itself is durable and strong and is also highly adjustable.

Additionally, you can also easily fit on rails of thickness up to 1/8″.


Knob: The window lock features a knob style, which makes it easier to screw it into place.

Construction: The Defender Security lock also features a strong and durable build, with a tight grip on the railing.

Adjustable: Using the knob, the sliding lock is also highly adjustable.

Setup: Lastly, this model is also simple to install, which should take your very little time.


Size: The only con, is that this model is quite small.

Defender Security

Defender Security U 9819 Aluminum, Sliding Window Security Lock (4 Pack),Silver
  • Used to secure sliding window in a closed or ventilating position
  • Thumb turn screw secures lock in place
  • Fits up to 1/8 inch thick rails
  • Extruded aluminum construction
  • Easy to install

Last update on 2023-09-22 at 09:01 / Affiliate links / Images from Amazon Product Advertising API

The best sliding lock for vinyl windows is the Defender Security U 9809. This lock can easily be installed without a marring frame, and it comes with an easily adjustable jaw, that can fit most vinyl frames.

In addition, this model also features a powerful diecast build and can even be used as double-hung window locks for ventilation.


Lock Lever: For more efficient performance, this lock includes a cam style locking lever.

Secure Sliding: This lock offers extra security as it will ensure to secure your windows and doors properly at all times.

Secondary Lock: Additionally, the Defender Security window lock can also be used as a double-hung window lock for ventilation.

Thickness: Lastly, it also has a decent thickness for wider rails.


Knob: The knob needs to be turned carefully since it can break off if handled with force.