---
product_id: 253382236
title: "PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction (Satin Nickel Anodized Finish)"
brand: "prime-line"
price: "€ 85.02"
currency: EUR
in_stock: true
reviews_count: 7
category: "Prime Line"
url: https://www.desertcart.gr/products/253382236-prime-line-defender-security-u-10827-door-reinforcement-lock-add
store_origin: GR
region: Greece
---

# Child-safe, tamper-resistant spring lock 3” hardened screws included 800 lbs force resistance PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction (Satin Nickel Anodized Finish)

**Brand:** prime-line
**Price:** € 85.02
**Availability:** ✅ In Stock

## Summary

> 🛡️ Lock down your peace of mind with Defender-level security!

## Quick Answers

- **What is this?** PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction (Satin Nickel Anodized Finish) by prime-line
- **How much does it cost?** € 85.02 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/253382236-prime-line-defender-security-u-10827-door-reinforcement-lock-add)

## Best For

- prime-line enthusiasts

## Why This Product

- Trusted prime-line brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Fit:** Compatible with any swing-in door thickness for versatile home protection.
- • **Sleek & Durable:** Satin nickel anodized aluminum finish blends style with long-lasting durability.
- • **Unmatched Strength:** Withstands up to 800 lbs of force to keep intruders out.
- • **Family-Safe Security:** Spring-loaded design keeps kids safe and deters tampering.
- • **Effortless Installation:** 3” hardened screws included for a quick, secure setup in minutes.

## Overview

The PRIME-LINE Defender Security U 10827 Door Reinforcement Lock is a robust aluminum lock designed to prevent unauthorized entry by withstanding up to 800 lbs of force. Featuring a child-safe, tamper-resistant spring-loaded mechanism and easy installation with included hardened screws, it fits any swing-in door thickness. Finished in satin nickel anodized aluminum, it offers both durability and a sleek look, making it an essential upgrade for millennial professionals seeking reliable, stylish home security.

## Description

Buy PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction (Satin Nickel Anodized Finish) online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase.

Review: Perfect Security Door Blocker - This is the second Defender Door Blocker we bought,very strong ,virtually impossible to break open the lock from outside,easy to install,screws comes along with the pack.As this gives additional security for the door,its highly recommended,moreover there is no need to drill any holes on the door for installing this blocker as this is fitted to the door frame.Very good product.
Review: Its not a great product. - The screws that came along is a JOKE. Dont install those screws. IT is meant for butter boards. DISAPPOINTED....

## Features

- 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” hardened screws make installation a breeze – extra security and peace of mind can be achieved in just minutes!
- ADDITIONAL HOME SECURITY - Use this high security door reinforcement lock for additional home security on any swing-in door of any door thickness. It helps to ensure any door cannot be opened from the outside.
- CHILD-SAFE AND TAMPER-RESISTANT – This door reinforcement lock has a spring-loaded design that is both child-safe and tamper-resistant. It can be installed higher on the door where your children can’t reach! Plus, not only can doors not be kicked in by intruders, it protects against lock picking and bumping while in the locked position.
- WATCH THE VIDEO ON THIS PAGE for installation tips and operating instructions.
- For all dimensional information please refer to the line art and compare to your needs before purchasing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00D2K367Y |
| ASIN  | B00D2K367Y |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #35,419 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #28 in Door Lock Replacement Parts |
| Color | Satin Nickel |
| Country of origin  | China |
| Customer Reviews | 4.7 4.7 out of 5 stars (27,398) |
| Customer reviews | 4.7 4.7 out of 5 stars (27,398) |
| Date First Available | 13 June 2013 |
| Date First Available  | 13 June 2013 |
| Department  | Unisex-Adult |
| Finish | Satin Nickel |
| Included components | 3" hardened screws |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 168 g |
| Item model number | U 10827 |
| Item model number  | U 10827 |
| Manufacturer | Prime-Line Products |
| Manufacturer  | Prime-Line Products |
| Material | Aluminum |
| Number Of Pieces | 1 |
| Part number | U 10827 |
| Plug Profile | Door Mount |
| Product Dimensions | 6.35 x 3.51 x 7.62 cm; 167.83 g |
| Product Dimensions  | 6.35 x 3.51 x 7.62 cm; 167.83 g |
| Shape | Rectangular |
| Size | 3 in. |
| Special Features | Burglar Resistant, Child Safe, Withstands 800 Lbs of Strength, Spring-loaded Design |
| Style | Lock |

## Product Details

- **Brand:** PRIME-LINE
- **Item dimensions L x W x H:** 6.4 x 3.5 x 7.6 centimeters
- **Lock type:** Deadbolt
- **Material:** Aluminum
- **Special features:** Burglar Resistant, Child Safe, Withstands 800 Lbs of Strength, Spring-loaded Design

## Images

![PRIME-LINE Defender Security U 10827 Door Reinforcement Lock – Add Extra, High Security to your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction (Satin Nickel Anodized Finish) - Image 1](https://m.media-amazon.com/images/I/61qMtnKyOxL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Would the Fire Department have trouble entering a house with this lock in case of a fire?**
A: I have experience breaking doors.   I’ve put locks like this or better on my house knowing it will slow the fire dept down a bit but like others have said we have tools that will break even this.  A halligan tool in the right hands will get through this pretty quickly, however with a lot of noise and certainly will deter the average criminal. 800lbs is a good amount of force to withstand, I think a average 200lb fireman with a halligan tool is probably capable of 1000lbs Of force applied to a certain spot on the door.  If you put the lock high or low that will make breaking That more difficult.  But the hydraulic tools fireman carry go up to 5000lbs.

**Q: Does it only work when someone is inside?**
A: I installed this on my front door.  As others have said, you must be inside to lock it, and it cannot be locked or unlocked from the outside.  So you have no access to the door from the outside when the lock is in place.  I keep it locked all the time, even when I'm not home, because I go in and out through my back door.  For extra safety and strength, I installed two of them on my front door, one about chest high and one about two feet from the floor.  I did this because I have a glass panel on the top half of the door, so if a burglar breaks the window, the bottom blocker is out of reach.  As extra security for my back door, I installed a security door (like a screen door except it's heavy gauge metal with its own handle lock and deadbolt).This door blocker is extremely well-made (heavy metal) and is a fantastic product.  I highly recommend it.

**Q: do  the screws come with this, or if not, what size do I need to buy**
A: Yes screws come with this device don't use them they're garbage go buy yourself some good heavy duty three to four inch screws from the hardware store so you can get into the frame of the house not just a door frame it'll make this device a lot more sturdy

**Q: I bought this but cannot open it. Is mine defective or is there a trick to opening it?**
A: Sometimes you are right. I had one defective out of three I received. The spring was loaded improperly which made the latch always to be in the open. Or if I forced it, the spring would dislodge and make it difficult to even close. And once closed it would not open. Now if that is the case then you need replacement.  However, if you are trying to understand how it works, all you have to do is when the latch lodged in the recess, basically in its closed position, pull out as if you are navigating around the latch notch that stops it. So the idea is pull laterally first and then turn the latch around the notch. Hope that helps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect Security Door Blocker
*by S***S on 2 April 2024*

This is the second Defender Door Blocker we bought,very strong ,virtually impossible to break open the lock from outside,easy to install,screws comes along with the pack.As this gives additional security for the door,its highly recommended,moreover there is no need to drill any holes on the door for installing this blocker as this is fitted to the door frame.Very good product.

### ⭐ Its not a great product.
*by H***S on 12 May 2021*

The screws that came along is a JOKE. Dont install those screws. IT is meant for butter boards. DISAPPOINTED....

### ⭐⭐⭐⭐⭐ Review
*by P***L on 8 January 2019*

Originally I had watched a Facebook video my girlfriend had sent me about this new security product and i thought this has got to have a catch or be phony.... So what could $22 bucks hurt spending it to try this out so i bought it and the only thing i didnt not like is i got uline instead of prime-line not a big deal theyre all the same. I installed it shortly after recieveing it with my impact driver with the 3"inch screws supplied and then i got my girlfriend to lock it so that i could test its strength, i am 200+lbs 5"8 heavy frame 56% muscle fairly good shape and my cousin who is 5"10 about 200 we both hip checked as well as tried 10+ times to boot the door in with just that no lockes engaged and shoulder check it... Result im pretty sure that even if u have a good new solid house your hinges would give out before this thing will -Great buy -Good value -Super Strong ( no to brag but ive ripped exterior doors on a new house off by accident and this held up to me) -800LBS to bust it -Quality product -Easy installation(you will need an impact driver for this) All in all a great purchase & have reccomended this to my friends and family.

## Frequently Bought Together

- Prime-Line 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 U 10385 Door Strike, for Use with 5-1/2 In. and 6 In. Hole Spacing On Dead Latch and Deadbolt, Steel, Satin Nickel (Single Pack)
- Hinge Outlet Satin Nickel Wood Screws, Heavy-Duty Screws for Doors, Cabinets, Furniture & DIY Projects (9 x 3 Inch – 24 Pack)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-27*