---
product_id: 330774912
title: "PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack)"
brand: "prime-line"
price: "E£ 2713"
currency: EGP
in_stock: true
reviews_count: 5
category: "Prime Line"
url: https://www.desertcart.com.eg/products/330774912-prime-line-defender-security-u-9551-1-3-4-in
store_origin: EG
region: Egypt
---

# Reinforces door lock area Pre-punched for easy install Solid brass for lasting strength PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack)

**Brand:** prime-line
**Price:** E£ 2713
**Availability:** ✅ In Stock

## Summary

> 🛡️ Lock in peace of mind with brass-built strength!

## Quick Answers

- **What is this?** PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack) by prime-line
- **How much does it cost?** E£ 2713 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.eg](https://www.desertcart.com.eg/products/330774912-prime-line-defender-security-u-9551-1-3-4-in)

## 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

- • **Precision Fit:** Tailored for 1-3/4 inch thick doors with a 2-1/8 inch bore and 2-3/8 inch backset for seamless integration.
- • **Universal Appeal:** Compatible with metal, fiberglass, and wood doors—upgrade your security regardless of door type.
- • **Effortless Upgrade:** Includes all mounting hardware and pre-punched holes for a quick, no-fuss installation.
- • **Premium Durability:** Crafted from solid brass alloy steel, designed to withstand wear and resist tampering.
- • **Fortify Your Entry Point:** Reinforces the vulnerable latch area to prevent forced entry and boost home security.

## Overview

The PRIME-LINE Defender Security U 9551 is a solid brass lock and door reinforcer designed to enhance door security by reinforcing the latch area. It fits 1-3/4 inch thick doors with a 2-1/8 inch bore and 2-3/8 inch backset, suitable for metal, fiberglass, and wood doors. Featuring pre-punched mounting holes and included hardware, it ensures quick installation and long-lasting protection against forced entry.

## Description

Defender Security U 9551 Stainless Steel Lock and Door Reinforcer assists in preventing forced entry by reinforcing the weak spot of an entry door. It can be used to reinforce and repair both metal and wood doors. Made of solid brass construction, the lock reinforcer plate comes finished in brass. All the necessary mounting hardware is included for a quick and easy installation. The lock reinforcement plate is pre-punched for mounting. The reinforcer is designed for 1-3/8 inch thick doors that have mortise or drive-in latches. It features one 2-1/8 inch bore with a 2-3/8 inch backset. The door reinforcer is recessed. Please refer to the line art drawing for dimensions and compare to your needs before purchasing (Not Universal).

Review: It was to short did not reach the pad lock hole no good for me,measure from edge of door to center of hole does not measure the same at all sorry it stainless steel nice nothing els to say sorry
Review: Cumplio las expectativas de mi compra y es un producto de excelente calidad

## Features

- ADDED SECURITY – Prevent forced entry by reinforcing the weak spot of your door with the non-recessed door lock reinforcer; use to reinforce and repair both metal, fiberglass and wood doors when the latch area has been compromised
- BUILT TO LAST – Made of stainless steel, the door lock reinforcement plate comes in a natural finish to fit over a single bore hole on your door
- EASY INSTALLATION – All the necessary mounting hardware is included with the lock reinforcement plate for a quick and easy installation; the door reinforcer plate is pre-punched for mounting. Remove the protective film after installation
- DIMENSIONS – The door lock reinforcement plate is designed for 1-3/4 inch thick doors only that have a 2-1/8 inch bore hole through the door, with a 2-3/8 inch backset from the edge of the door to the center of the bore holes
- NOTE – Make sure to dry fit the 3-7/8 inch wide by 9 inch tall with a 0.03 inch thickness door lock reinforcer before permanently installing and refer to the line art drawing and compare with your needs before purchasing
- Used to reinforce and repair doors to aide in preventing forced entry
- Fits 1-3/4 in. thick doors, 2-1/8 in. bores, 2-3/8 in. backset, 3-7/8 in. width x 9 in. height
- Stainless steel

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000OFTIL8 |
| ASIN  | B000OFTIL8 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #173,541 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #828 in Door Latches & Bolts |
| Color | Stainless Steel |
| Country of origin  | USA |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,061) |
| Customer reviews | 4.4 4.4 out of 5 stars (1,061) |
| Date First Available | 1 January 2024 |
| Date First Available  | 1 January 2024 |
| Department  | Exterior Door Trim |
| Finish | Stainless Steel |
| Included components | Lock and Door Reinforcer |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 363 g |
| Item model number | U 9551 |
| Item model number  | U 9551 |
| Manufacturer | Prime-Line Products |
| Manufacturer  | Prime-Line Products |
| Material | Alloy Steel |
| Number Of Pieces | 1 |
| Part number | U 9551 |
| Plug Profile | Door Mount |
| Product Dimensions | 9.84 x 4.45 x 22.86 cm; 362.87 g |
| Product Dimensions  | 9.84 x 4.45 x 22.86 cm; 362.87 g |
| Shape | shape |
| Size | 1-3/4 in. |
| Special Features | Anti-Forced Entry |
| Style | Slip On |

## Product Details

- **Brand:** PRIME-LINE
- **Item dimensions L x W x H:** 9.8 x 4.4 x 22.9 centimeters
- **Lock type:** Deadbolt
- **Material:** Alloy Steel
- **Special features:** Anti-Forced Entry

## Images

![PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack) - Image 1](https://m.media-amazon.com/images/I/51XtMzs6xqL.jpg)
![PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack) - Image 2](https://m.media-amazon.com/images/I/61UJR6yOy5L.jpg)
![PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack) - Image 3](https://m.media-amazon.com/images/I/61pBpl6nweL.jpg)
![PRIME-LINE Defender Security U 9551 1-3/4 In. x 9 In. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 In. Single Bore, 2-3/8 In. Backset (Single Pack) - Image 4](https://m.media-amazon.com/images/I/71UrKVyEOrL.jpg)

## Customer Reviews

### ⭐ Review
*by A***R on 30 September 2018*

It was to short did not reach the pad lock hole no good for me,measure from edge of door to center of hole does not measure the same at all sorry it stainless steel nice nothing els to say sorry

### ⭐⭐⭐⭐⭐ Review
*by A***R on 8 January 2023*

Cumplio las expectativas de mi compra y es un producto de excelente calidad

### ⭐⭐⭐⭐⭐ Review
*by R***S on 16 December 2025*

really made a big difference on my garage

## Frequently Bought Together

- Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/4 In. Thick Doors, Stainless Steel Finish (Single Pack)
- Prime-Line U 9476 Maximum Security Latch Strike, 1-1/4 In. x 7-7/8 In., Steel, Chrome Plated (Single Pack)
- Prime-Line U 9585 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 In. Thick Doors, Stainless Steel Finish (Single Pack)

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*Product available on Desertcart Egypt*
*Store origin: EG*
*Last updated: 2026-01-25*