---
product_id: 383193097
title: "Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack)"
brand: "prime-line"
price: "$92.74"
currency: USD
in_stock: true
reviews_count: 5
category: "Prime Line"
url: https://www.desertcart.us/products/383193097-prime-line-u-9551-stainless-steel-lock-and-door-reinforcement
store_origin: US
region: United States of America
---

# Reinforces door lock area Pre-punched for easy install Durable stainless steel build Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack)

**Brand:** prime-line
**Price:** $92.74
**Availability:** ✅ In Stock

## Summary

> 🛡️ Lock in peace of mind with steel-strong security!

## Quick Answers

- **What is this?** Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) by prime-line
- **How much does it cost?** $92.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/383193097-prime-line-u-9551-stainless-steel-lock-and-door-reinforcement)

## 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

- • **Sleek & Subtle:** Natural stainless finish blends seamlessly with modern door aesthetics without compromising style.
- • **Built to Endure:** Crafted from corrosion-resistant stainless steel for long-lasting, rust-free protection.
- • **Universal Strength:** Fits standard 1-3/4 inch thick doors with 2-1/8 inch bore and 2-3/8 inch backset for broad compatibility.
- • **Effortless Installation:** Pre-punched design with included hardware means you’re secured in minutes, no hassle.
- • **Fortify Your Entry Point:** Reinforces the vulnerable latch area to prevent forced entry and boost home security.

## Overview

The Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate is a robust security upgrade designed for 1-3/4 inch thick doors with standard bore and backset dimensions. Made from durable stainless steel, it reinforces the door’s latch area to prevent forced entry. Easy to install with pre-punched holes and included hardware, this sleek reinforcement plate offers a corrosion-resistant finish that complements modern door designs while delivering reliable, long-term protection.

## 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 featuress 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: de excelente calidad - Cumplio las expectativas de mi compra y es un producto de excelente calidad
Review: Protége bien la porte contre inteuision - Excellent

## 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 |
| Best Sellers Rank | 626,546 in DIY & Tools ( See Top 100 in DIY & Tools ) 5,893 in Latches & Bolts |
| Brand | Prime-Line |
| Colour | Stainless Steel (If the Intention Was to Describe Material, Not Color) |
| Control Method | Push Button |
| Country of Origin | USA |
| Customer Reviews | 4.4 out of 5 stars 1,099 Reviews |
| Finish | Stainless Steel |
| Global Trade Identification Number | 00049793195517 |
| Included Components | Prime-Line Products U 9551 Lock & Door Reinforcer, 2-1/8 in. x 2-3/8 in. x 1-3/4 in., Stainless Steel, Recessed |
| Item Dimensions | 9.2 x 4.4 x 11.4 centimetres |
| Item Type Name | Add Extra Security to Your Home, Helps Prevent Forced Entry |
| Item Weight | 0.8 Pounds |
| Item dimensions L x W x H | 9.2 x 4.4 x 11.4 centimetres |
| Lock Type | Deadbolt |
| Lock type | Deadbolt |
| Manufacturer | Prime-Line Products |
| Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. |
| Material | Alloy Steel |
| Model Name | Door guard |
| Model Number | U 9551 |
| Number of Pieces | 1 |
| Part Number | U 9551 |
| Recommended Uses For Product | Sicherheit zu Hause, Verstärkung von Eingangstüren, verhindert gewaltsames Eindringen |
| Recommended uses for product | Sicherheit zu Hause, Verstärkung von Eingangstüren, verhindert gewaltsames Eindringen |
| Special Features | Diebstahlschutz, Einfach anzubringen, Einfach zu installieren, Robuster Schutz, Rostfrei |
| Special feature | Diebstahlschutz, Einfach anzubringen, Einfach zu installieren, Robuster Schutz, Rostfrei |
| Style | Modern |
| UPC | 049793195517 |
| Unit Count | 1.0 count |

## Product Details

- **Brand:** Prime-Line
- **Item dimensions L x W x H:** 9.8 x 4.4 x 22.9 centimetres
- **Material:** Alloy Steel
- **Style:** Modern
- **Colour:** Stainless Steel (If the Intention Was to Describe Material, Not Color)

## Images

![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 1](https://m.media-amazon.com/images/I/51XtMzs6xqL.jpg)
![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 2](https://m.media-amazon.com/images/I/51ngqhIcl4L.jpg)
![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 3](https://m.media-amazon.com/images/I/61nd7zjKwRL.jpg)
![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 4](https://m.media-amazon.com/images/I/61IF5DyIwnL.jpg)
![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/8 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 5](https://m.media-amazon.com/images/I/617WH618FML.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ de excelente calidad
*by A***R on 8 January 2023*

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

### ⭐⭐⭐⭐⭐ Protége bien la porte contre inteuision
*by C***N on 7 April 2026*

Excellent

### ⭐⭐⭐⭐⭐ Great adition to door
*by I***M on 10 March 2025*

Quality: The plate is high quality, with clean edges and precise dimensions. Functionality: As advertised, the product effectively reinforces the existing door set. After my wife's constant complaints, I purchased this item to prevent greasy fingerprints from accumulating on the door due to frequent entry and exit from the garage after working on projects. Now I can easily wipe off greasy marks and have a happy spouse. The installation required the mortising of the area behind the faceplate to ensure that the reinforcing plate sits flush with the door’s edge. Your installation may also require mortising the striker side of the jam. Tip: Remove the adhesive plastic coating from the plate after fitting and before final assembly.

## 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 United States of America*
*Store origin: US*
*Last updated: 2026-08-03*