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Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3 In. Stop, Aluminum Construction, Satin Nickel (Single Pack)

4.7 4.7 out of 5 stars 19,742 ratings

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Purchase options and add-ons

Brand PRIME-LINE
Special Feature Weather Resistant
Lock Type Rim Lock
Item Dimensions LxWxH 2.5 x 1.38 x 3 inches
Material Aluminum

About this item

  • KEEP YOUR HOME SAFE – Designed to withstand 800 lbs. of force, this U 10827 satin nickel finish door reinforcement lock helps to prevent doors from being kicked in, increasing your home security and keeping you and your family safe!
  • EASY INSTALLATION – The included 3 inch hardened screws make installation a breeze – extra security and peace of mind can be achieved in just minutes. Watch the video on this page for installation tips and operating instructions.
  • ADDITIONAL HOME SECURITY – Use this high security door reinforcement lock for additional home security on any swing-in door of any thickness. It helps to ensure any door cannot be opened from the outside.
  • CHILD-SAFE AND TAMPER-RESISTANT – The spring-loaded design can be installed at a higher level, to ensure it is child-safe. Plus, while locked, this tamper-resistant door latch protects against the door being kicked in, lock picking and bumping.
  • PRE-DRILLING – The included 3 inch security screws require holes to be pre-drilled with 1/8 inch drill bit. Do not use a drill driver with max torque setting to install the 3 inch screws as you can strip or break the heads. Some doors may require mortising. Additional mortising may be required to fit your door.
  • NOTE - You may wish to purchase the MP108278 high security finger pull, designed to make opening this lock easier
See more product details

Customer ratings by feature

Lock Feature
4.7 4.7
Easy to lock
4.6 4.6
Easy to install
4.5 4.5

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$16.49
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$16.25 ($0.68/Count)
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From the brand


From the manufacturer

Category Module_Security
U 10827

Dimensional Line Drawing

primeline logo building
Why Prime-Line?

Founded in 1978, Prime-Line’s mission is to empower national distributors, commercial companies, and individual homeowners with high-quality repair solutions.

  • Repair & Replacement Parts
  • Safety & Security Products
  • For Your Home
  • For Your Business

U-10827 - Door Reinforcement Lock

3 In. Stop, Aluminum Construction, Satin Nickel

These high security door locks are constructed of extruded aluminum and meet the Texas building code requirements. Featuring a spring-loaded, child-safe and tamper-resistant design that protects against unauthorized entry by preventing lock bumping and lock picking (while in the locked position). Choose from one of six finishes and increase your home's security and give your family extra peace of mind.

  • Tamper resistant and child-safe design
  • Installs in just minutes using 3" hardened screws
  • Cannot be opened from the outside
  • Requires Drill, 1/8 in. drill bit and Phillips screwdriver
  • Chisel may be required if door fits tightly against the jamb (mortised installation)

FEATURES & BENEFITS

U 10827 feature benefit 1

U 10827 feature benefit 2

U 10827 feature benefit 3

This high security door lock is constructed of extruded aluminum and comes in a satin nickel anodized finish.

Features a spring-loaded, child-safe and tamper-resistant design that protects against unauthorized entry by preventing lock bumping and lock picking.

Designed to withstand up to 800 lbs. of force, making it virtually impossible to breach from the exterior.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here. [PDF ]

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Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3 In. Stop, Aluminum Construction, Satin Nickel (Single Pack)


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Product guides and documents

Product Description

Product Description

Add an extra layer of security to your home with this Defender Security Door Reinforcement Lock. Designed to withstand 800 lbs. of force, you can rest easy knowing your family is safe and protected! This reinforcement lock has a spring-loaded design, aluminum construction and a satin nickel anodized finish. This reinforcement lock can be quickly and easily installed on any swing-in door of any thickness, and can help ensure the door cannot be opened from the outside by being kicked inch Additionally, it’s tamper-resistant, so it can protect against lock picking and bumping. Plus, it’s child-safe, because you can install it higher on a door, where your young ones can’t reach. Length is 2 to 0.19 inch. Width is 1 to 0.38 inch. Installation takes minutes, and the U 10827 door reinforcement lock comes with 3 inch hardened screws. Extra home security and peace of mind are well within reach, and doesn’t have to come with the high price tag of an alarm system! Be sure to view the manufacturer’s How-To Installation Video also linked to this page, in the upper left-hand corner.

From the Manufacturer

This entry door stop is constructed from aluminum and comes finished in satin nickel. It protects against unauthorized entry by preventing lock bumping and lock picking while in locked position. Fits any size door and has a child-safe design.

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Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3 In. Stop, Aluminum Construction, Satin Nickel (Single Pack)
PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3 In. Stop, Aluminum Construction, Satin Nickel (Single Pack)
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Price-30% $16.49
List:$23.69
-29% $31.19
List:$43.69
$33.99$19.99-15% $33.99
List:$40.00
Delivery
Get it as soon as Wednesday, Apr 3
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to lock
4.6
4.7
4.7
4.6
4.7
Easy to install
4.5
4.8
4.6
4.6
4.7
Lock Feature
4.7
4.8
4.5
4.7
Easy to use
5.0
4.7
4.7
Sturdiness
5.0
4.6
4.7
Sold By
BeatrixKiddo
Amazon.com
Steinwhale
AceMining
Lumiadot
lock type
Rim Lock
Rim Lock
Frame-lock
Key Lock
Frame-lock
number of items
1
2
3
3
material
Aluminum
Aluminum
Aluminum
Metal
Aluminum
finish type
Satin Nickel
satin,nickel
Smooth sand-blasting oxidation surface
Smooth sand-blasting oxidation surface

Customer reviews

4.7 out of 5 stars
4.7 out of 5
19,742 global ratings

Customers say

Customers like the ease of installation using the lock. They mention that the provided instructions are straight forward. They appreciate the great security provided by the lock, saying that it provides better protection than many door locks. Customers also praise the quality of the product, saying it's a top-notch choice. They say that the lock is sturdy and well-made, providing a great layer of stability to the door. Customers are also satisfied with appearance, and value. However, some customers have reported issues with the screws that come with the lock; they say that they're super weak and snap in half as they'd be screwing them in.

AI-generated from the text of customer reviews

1,157 customers mention1,094 positive63 negative

Customers find the lock easy to install and use. They say the provided instructions are straightforward. Some mention that the lock is simple and effective.

"...This reinforced door lock is not only a simple device it's easy to install...." Read more

"...With its aluminum construction, 3-inch stop, easy installation, and stylish satin nickel finish, this door reinforcement lock has become a critical..." Read more

"...Easy to use, solid steel, and provides that extra protection. We "tested" it and tried to get into our house and it passed with flying colors!..." Read more

"Well worth the money, easy installation.Door is secure when lock is engaged" Read more

1,100 customers mention988 positive112 negative

Customers like the lock's security. They say it provides better protection than many door locks, it's easy to install, and it makes them feel well protected. Customers also say the lock is sturdy and provides extra safety with ease.

"...10827 Door Reinforcement Lock is more than just a lock; it's a high-security solution for protecting my home and preventing unauthorized entry...." Read more

"...Easy to use, solid steel, and provides that extra protection. We "tested" it and tried to get into our house and it passed with flying colors!..." Read more

"Well worth the money, easy installation.Door is secure when lock is engaged" Read more

"...Living alone adds added protection for me. Great product." Read more

1,075 customers mention976 positive99 negative

Customers are satisfied with the quality of the door reinforcement lock. They mention that it is a top-notch choice, works great, and is well worth the money. Some say that the lock is easy to install and makes them feel more secure at night.

"...Overall this is an easy to install lock and well worth the money. I feel safe at night knowing nobody can break down my door even if they tried...." Read more

"...the Defender Security U 10827 Door Reinforcement Lock is a top-notch choice...." Read more

"...The door did not budge at all. The comfort of the extra security at night, for a low price of this lock, is a no-brainer." Read more

"Well worth the money, easy installation.Door is secure when lock is engaged" Read more

680 customers mention548 positive132 negative

Customers like the durability of the lock. They mention that it's well made, sturdy, and provides a great layer of stability to the door. The parts are fairly high quality, and the screws are strong steel. It's easy to install, and it withstands break-ins and pressure from the other side of the door, making it a good choice for homes.

"...This makes it harder for people to break down your door and reinforces your door frame. Overall great solid buy and a must have to secure your home." Read more

"...It offers robust durability and strength, ensuring that my door is fortified against forced entry attempts...." Read more

"...Easy to use, solid steel, and provides that extra protection. We "tested" it and tried to get into our house and it passed with flying colors!..." Read more

"...and the door is not budging. The lock opens and closes fine and feels very solid when it's closed and there's no smudges of any kind with the black..." Read more

251 customers mention238 positive13 negative

Customers like the appearance of the lock. They say it looks good, has an excellent design, and is not bulky or tacky looking. The lock is easy to install and has a stylish satin nickel finish. Customers also mention that the design of these locks is simple but super effective, and it blends in with wall decor.

"...aluminum construction, 3-inch stop, easy installation, and stylish satin nickel finish, this door reinforcement lock has become a critical component..." Read more

"...It's extremely well made and even looks kind of elegant. It is quite easy to use, but honestly it could be easier...." Read more

"...We really like how secure it is, easy to open and close and is doesn't stand out as a security feature...." Read more

"Excellent design and secure." Read more

173 customers mention141 positive32 negative

Customers like the value of the lock. They say it's reasonably priced, affordable, and works as well as it should. Customers also say it is a worthy product and an inexpensive way to slow down a would be home invasion. They also mention that it is great for renters.

"...The comfort of the extra security at night, for a low price of this lock, is a no-brainer." Read more

"...think these tips are a good compromise, especially since they require so little money...." Read more

"Easy installation. Great product for a great price!" Read more

"Reinforcing your entry door is one of the simplest, cheapest, and most effective upgrades you can make to home security...." Read more

150 customers mention70 positive80 negative

Customers are mixed about the ease of opening and closing the lock. Some mention it works great and is easy to open/close, while others say it's more difficult to open due to the lack of finger. Some say the lock is nice and solid, but it'll be difficult to kick open the door.

"...lock, unlock, and install the only downside is that the door is a little difficult to open." Read more

"...This lock is well constructed and easy to open and close. I will say this...." Read more

"...door only locks into the 1” thick door jamb, making it fairly easy to kick open the door even when the deadbolt is engaged...." Read more

"...and the door is not budging. The lock opens and closes fine and feels very solid when it's closed and there's no smudges of any kind with the black..." Read more

285 customers mention60 positive225 negative

Customers are dissatisfied with the screws that come with the lock. They mention that they're weak, snap in half, and cheap. Some say that the screws provided might not provide enough purchase to hold the lock in place, and that the 4" long screws included are very thin.

"...The screws that come with this are cheap and will break off if anyone dares to kick your door down...." Read more

"...it could have been a lot worse of a problem, because THE BROKEN SCREW WILL NOT COME OFF as you can see in the picture...." Read more

"...Works like a charm.Previous posting complaints is that the screws break. I drilled the pilot holes, then did an old carpenters trick...." Read more

"As you fasten it to the door frame there are no screws that are easily seen. We saw a tip to put some wire on it to make it easier to lift up." Read more

SOLID LOCK...BROKEN SCREWS...HOW TO INSTALL PROPERLY
4 Stars
SOLID LOCK...BROKEN SCREWS...HOW TO INSTALL PROPERLY
I read other people's reviews (great lock, except for the weak screws) so I ordered two of these for our new home's front door and the garage-side door. And I was hoping the 3-4 star reviews were wrong and I will be able to pull off a successful install. WRONG! Just like many others have said, the very first screw broke off. And after an hour and half ordeal and a broken off screw that I could not pull out, here's what I learned. Hope this helps future buyers and installers.FIRST, THE LOCK ITSELF...the lock is solid and polished nicely (just like the pictures). We got the satin nickel finish and it matches pretty well with our already installed hardwares. I would highly recommend it. (I ordered the "Defender Security" brand, formerly known as "Prime-Line," after contemplating whether I should get the cheaper versions but the other brands had some hard to pronounce names that threw me off and this is sold directly by Amazon.SECOND, THE INSTALL...this is where things went wrong. The provided instructions are straight forward and install was easy, THAT IS UNTIL THE TIP OF THE SCREW BROKE OFF/FLEW OFF. And from my experience, it could have been a lot worse of a problem, because THE BROKEN SCREW WILL NOT COME OFF as you can see in the picture.HERE'S THE PROBLEM. The standard 1/8 drill bit that they tell you to use is about 2 1/2 inches long hence it will not drill the whole length of the provided 3 inch long screw (the lock comes with three 3 inch long screws and four 1/2 inch pilot screws...not sure why they give you four). So my first screw which broke at the tip got stuck in the hardwood stud two-thirds way in. I should have listened to the reviewers, but I took a chance with the impact driver and it snapped at the very first attempt of trying to drive it in. And since it was two inches in already, the plier can't get it out. It will just shred the thred of the screw. They should have mentioned the fact that you need to use an extra long 1/8 drill bit because you are not going to drive those screws in without breaking them.THIRD...HERE'S HOW I FIXED MINE AND SUGGESTIONS FOR FUTURE BUYERS/INSTALLERSHOW I FIXED MINEI could have spent another $10 bucks for a stronger screws that can withstand an impact driver, but I found some #8 2 inch screws and decided to use them instead. And it worked out for us. And I was able to put in another 2 inch screw into the stud where the pilot screw is supposed to go so it was a solid install. I am sure the lock will probably now withstand only about 500-600 lbs of pressure instead of the promised "up to 800 lbs" but it feels solid. and the door is not budging. The lock opens and closes fine and feels very solid when it's closed and there's no smudges of any kind with the black plastic rubber guard.HERE'S MY SUGGESTIONS FOR A FUTURE CORRECT INSTALL(1) DO NOT USE AN IMPACT DRIVER ON THE SUPPLIED SCREWS!!! TRUST THE REVIEWS, THE SCREWS WILL BREAK AND YOU WILL REGRET IT. I could not get the broken screw out even with a torque plier and ended up nibbling and hammering it in so it doesn't stick out.(2) TO INSTALL WITH 3 INCH SCREWS (as recommended by the manufacturer), you will either need to have/buy stronger screws or have/buy at least 3.5 inches long 1/8 drill bit (standard length bit will not work).(3) COMPROMISED SOLUTION...If you don't want to fork over the extra money for stronger screws or extra long 1/8 drill bit (at least 3.5 inches long), I think 2 inch screws or 2.5 inch screws will do more than an adequate job of securing the lock PROVIDED THAT you hit the stud at least an inch into drilling. I am assuming most people will have #8 screws of varying lengths lying around at home and for my install, I was able to reinforce it further by using a 2 inch screw in place of the 1/2 inch pilot screw.(4) Btw, make sure you have about 1/8 inch gap to avoid having to chisel (if you are particular about aesthetics like I do)As many reviewers have said, other than the ordeal with the weak screws, I still recommend the lock.HOPE THIS HELPS!!!
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Top reviews from the United States

Reviewed in the United States on July 29, 2020
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5.0 out of 5 stars Great Lock For Added Protection
Reviewed in the United States on July 29, 2020
I live in a neighborhood where home invasions are frequent so i needed to think about what am i going to do to keep my family safe. I am a security conscious person. The first thing i think about is security in any situation i am in. This reinforced door lock is not only a simple device it's easy to install. I've seen a lot of people put this lock on the top part of their door and I can tell you putting it on top doesn't offer much security if an intruder tries to kick down your door. The middle of the door is the center of where force is met when someone kicks in your door. If you put this lock on top of your door the pressure from the blows to the door will put more pressure to the top area and snap the bottom portion of your door. The force of the blow is in the middle and that's where the lock should be to take the blows. How do i know? because I experimented on two doors using this lock. I placed one on top of my door were I see people putting it and i put one in the middle of the door. I found that the lock adsorbed the blows when the reinforced lock was put in the middle. We kicked the door down as hard as we could, we hit it with a sludge hammer, and also used a crow bar and it did not budge. When we put the lock on top we found that the door frame broke off and the door snapped because the pressure of the kicks and sludge hammer had snapped the door in half breaking the bottom part of the door. It all has to do with physics. This lock is well constructed and easy to open and close. I will say this. It's good to oil up the lock hinge from time to time to avoid friction which will occur over time. Also use concrete screws when drilling these onto the door frame. The screws that come with this are cheap and will break off if anyone dares to kick your door down. Overall this is an easy to install lock and well worth the money. I feel safe at night knowing nobody can break down my door even if they tried. This if placed right will withstand 500 and more lbs of pressure.

SIDE NOTE: For extra added protection you should combine this with a metal door strike plate (as seen in photo). This makes it harder for people to break down your door and reinforces your door frame. Overall great solid buy and a must have to secure your home.
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Reviewed in the United States on August 7, 2023
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Reviewed in the United States on November 18, 2023
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Reviewed in the United States on January 31, 2024

Top reviews from other countries

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Bertadel Audebri
5.0 out of 5 stars Pricey but worth it
Reviewed in Canada on February 9, 2024
Jose Maria Ramirez Mendaño
5.0 out of 5 stars Muy practico
Reviewed in Spain on September 18, 2023
Neetu
4.0 out of 5 stars Nice
Reviewed in India on May 12, 2019
One person found this helpful
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Markus Nin
5.0 out of 5 stars Easy to install quality product.
Reviewed in Australia on September 23, 2023
Sandra Hintz
5.0 out of 5 stars The best I’ve tried!
Reviewed in Canada on April 13, 2021
4 people found this helpful
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