--- product_id: 20019110 title: "Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/4 in. Thick Doors, Stainless Steel Finish (Single Pack)" brand: "prime-line" price: "¥5213" currency: JPY in_stock: true category: "Prime Line" url: https://www.desertcart.jp/products/20019110-prime-line-u-9551-stainless-steel-lock-and-door-reinforcement store_origin: JP region: Japan --- # Fits 1-3/4 inch thick doors Stainless steel strength Pre-punched, easy install Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/4 in. Thick Doors, Stainless Steel Finish (Single Pack) **Brand:** prime-line **Price:** ¥5213 **Availability:** ✅ In Stock ## Summary > 🔐 Lock in peace of mind with sleek, stainless steel security! ## Quick Answers - **What is this?** Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/4 in. Thick Doors, Stainless Steel Finish (Single Pack) by prime-line - **How much does it cost?** ¥5213 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/20019110-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 - • **Universal Compatibility:** Works on metal, wood, and fiberglass doors, making it the versatile choice for any professional or homeowner. - • **Fortify Your Entry Point:** Reinforces the vulnerable latch area to prevent forced entry and boost home security. - • **Hassle-Free Installation:** Comes with all mounting hardware and pre-punched holes for a quick, no-fuss setup—security in minutes. - • **Durable Stainless Steel Build:** Crafted from corrosion-resistant stainless steel to ensure long-lasting protection and sleek modern finish. - • **Precision Fit for Standard Doors:** Designed specifically for 1-3/4 inch thick doors with 2-1/8 inch bore and 2-3/8 inch backset for seamless integration. ## 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 included hardware and pre-punched holes, it fits metal, wood, and fiberglass doors, offering a modern, corrosion-resistant finish that blends security with style. ## Description Product Description Strengthen and repair entry doors with the Defender Security U 9551 Door Lock Reinforcer Plate. Designed to help reinforce one of the most vulnerable areas of a door, this security plate provides added protection against forced entry while restoring damaged or worn door lock openings. Suitable for both wood and metal doors, it offers a practical solution for improving door security without replacing the entire door. Constructed from durable stainless steel with a corrosion-resistant finish, this recessed reinforcer plate is built for long-lasting performance in residential applications. The plate is pre-punched for easy installation and includes all necessary mounting hardware. Designed for doors with a 2-1/8 in. bore and a 2-3/8 in. backset, it accommodates mortise and drive-in latch configurations. Measuring 3-7/8 in. wide by 9 in. high, this reinforcer is intended for compatible 1-3/4 in. thick doors. Be sure to compare all dimensions and latch specifications with your existing door before purchasing to ensure proper fit. From the Manufacturer This lock & door reinforcer is constructed of stainless steel and fits 1-3/4 in. thick doors. It features a recessed latch plate pocket for flush installation of hardware. This security device assists in preventing forced entry by reinforcing the weak spot of an entry door, and it can be used on both metal and wood doors. This item accommodates key-in knob locksets on doors that have 2-1/8 in. bore sizes with a backset of 2-3/8 in. The width of this door guard is 3-7/8 in. and it is 9-7/8 in. tall. These door reinforcers are easy to install and they are used by many. All installation fasteners are included with this item. ## Features - Ideal Use: Reinforces damaged or vulnerable lock areas on wood and metal entry doors to help improve security. - Dimensions & Compatibility: Fits 1-3/4 in. thick doors with a 2-1/8 in. bore and 2-3/8 in. backset; measures 3-7/8 in. W x 9 in. H - Materials & Components: Durable stainless steel construction with corrosion-resistant finish; includes mounting hardware - Key Features: Recessed design reinforces the lock area, helps resist forced entry, and works with mortise or drive-in latch installations - Fit Guidance: Compare door thickness, bore size, backset, and latch style with existing hardware before ordering ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000OFTIL8 | | Additional Features | Anti-Forced Entry | | Best Sellers Rank | #58,879 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #130 in Door Lock Replacement Parts | | Brand Name | PRIME-LINE | | Color | Stainless Steel | | Control Method | Touch | | Customer Reviews | 4.4 4.4 out of 5 stars (1,127) | | Finish Types | Stainless Steel | | Global Trade Identification Number | 00049793195517 | | Included Components | Lock and Door Reinforcer | | Item Dimensions | 3.62 x 1.75 x 4.5 inches | | Item Type Name | Lock and Door Reinforcer | | Item Weight | 12.8 ounces | | Lock Type | Deadbolt | | Manufacturer | Prime-Line Products | | Manufacturer Part Number | U 9551 | | Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. | | Material Type | Alloy Steel | | Model Name | Door guard | | Model Number | U 9551 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | Recommended Uses For Product | Reinforcing entry doors in residential and commercial buildings to prevent forced entry | | Style Name | Modern | | UPC | 049793195517 | | Unit Count | 1 Count | ## Product Details - **Brand:** PRIME-LINE - **Item dimensions L x W x H:** 3.62 x 1.75 x 4.5 inches - **Lock Type:** Deadbolt - **Material:** Alloy Steel - **Special Feature:** Anti-Forced Entry ## Images ![Prime-Line U 9551 Stainless Steel Lock and Door Reinforcement Plate for 1-3/4 in. Thick Doors, Stainless Steel Finish (Single Pack) - Image 1](https://m.media-amazon.com/images/I/51XtMzs6xqL.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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/20019110-prime-line-u-9551-stainless-steel-lock-and-door-reinforcement](https://www.desertcart.jp/products/20019110-prime-line-u-9551-stainless-steel-lock-and-door-reinforcement) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-24*