---
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: "Bs.541"
currency: BOB
in_stock: true
url: https://www.desertcart.bo/products/330774912-prime-line-defender-security-u-9551-1-3-4-in
store_origin: BO
region: Bolivia
---

# Reinforces door latch area Pre-punched for easy install Solid stainless steel durability 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:** Bs.541
**Availability:** ✅ In Stock

## Summary

> 🛡️ Lock down your peace of mind with effortless, professional-grade door reinforcement!

## 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?** Bs.541 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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

- • **Built to Withstand:** Crafted from solid stainless steel alloy for long-lasting, corrosion-resistant protection.
- • **Fortify Your Frontline:** Reinforces the vulnerable latch zone to prevent forced entry, securing your sanctuary.
- • **Sleek, Subtle Security:** Natural stainless finish blends with your door’s aesthetic while delivering maximum defense.
- • **Effortless Armor Upgrade:** Pre-punched design with included hardware means installation is a breeze—no pro needed.
- • **Precision Fit for 1-3/4" Doors:** Tailored dimensions ensure a seamless fit for standard single bore doors with 2-3/8" backset.

## Overview

The PRIME-LINE Defender Security U 9551 is a solid stainless steel lock and door reinforcer designed specifically for 1-3/4 inch thick doors with a 2-1/8 inch bore and 2-3/8 inch backset. It prevents forced entry by reinforcing the door’s latch area, comes with all mounting hardware, and features a pre-punched plate for quick installation. Durable and corrosion-resistant, it offers a sleek, natural stainless finish that enhances security without compromising style.

## 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).

## 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 |
|---------------|-------|
| Manufacturer | Prime-Line Products |
| Part number | U 9551 |
| Item Weight | 363 g |
| Product Dimensions | 9.84 x 4.45 x 22.86 cm; 362.87 g |
| Item model number | U 9551 |
| Size | 1-3/4 in. |
| Color | Stainless Steel |
| Style | Slip On |
| Finish | Stainless Steel |
| Material | Alloy Steel |
| Shape | shape |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Plug Profile | Door Mount |
| Special Features | Anti-Forced Entry |
| Included components | Lock and Door Reinforcer |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** PRIME-LINE
- **Special features:** Anti-Forced Entry
- **Item dimensions L x W x H:** 9.8 x 4.4 x 22.9 centimeters
- **Material:** Alloy Steel
- **Recommended uses for product:** Reinforcing entry doors in residential and commercial buildings to prevent 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/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 3](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 4](https://m.media-amazon.com/images/I/71UrKVyEOrL.jpg)

## 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 Bolivia*
*Store origin: BO*
*Last updated: 2026-01-22*