---
product_id: 15184491
title: "Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)"
brand: "defender security"
price: "€ 10.96"
currency: EUR
in_stock: true
category: "Defender Security"
url: https://www.desertcart.pt/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated
store_origin: PT
region: Portugal
---

# Backset conversion flexibility 3.5-inch diameter precision fit Steel nickel-plated durability Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)

**Brand:** defender security
**Price:** € 10.96
**Availability:** ✅ In Stock

## Summary

> ✨ Upgrade your door’s style and function in a snap!

## Quick Answers

- **What is this?** Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack) by defender security
- **How much does it cost?** € 10.96 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated)

## Best For

- defender security enthusiasts

## Why This Product

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

## Key Features

- • **Premium Steel Build:** Nickel-plated alloy steel ensures long-lasting strength and weather resistance
- • **Sleek Chrome Finish:** Modern, polished look that elevates any door aesthetic
- • **Easy DIY Installation:** Quick setup behind your handleset—no professional needed
- • **Seamless Door Revival:** Effortlessly covers marred or damaged doors for a flawless finish
- • **Precision Backset Conversion:** Switch between 2-3/8 inch and 2-3/4 inch backsets without hassle

## Overview

The Prime-Line U 9517 is a 3.5-inch chrome-plated steel back plate designed to cover door imperfections and convert backsets between 2-3/8 and 2-3/4 inches. Sold in a convenient 2-pack, it offers durable, weather-resistant protection with a sleek modern finish, perfect for quick door renovations or repairs.

## Description

This is a 3-1/2 inch diameter door cover plate. It will cover marred doors and allows a conversion from 2-3/8 inch to 2-3/4 inch backset, or 2-3/4 inch to 2-3/8 inch backset. The steel construction and chrome finish plate is easily installed behind your handleset.

## Features

- Typically used on 2-1/8 inch bore lock sets
- Converts a 2-3/4 inch to 2-3/8 in
- Steel nickel plated
- Covers marred doors
- Lock sets are not included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0072L1EPA |
| Additional Features | Weather Resistant |
| Best Sellers Rank | #122,668 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #368 in Door Lock Replacement Parts |
| Brand Name | Defender Security |
| Color | Chrome |
| Control Method | Touch |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,257) |
| Finish Types | Chrome |
| Global Trade Identification Number | 00049793095176 |
| Included Components | Back Plate |
| Item Dimensions | 0.06 x 3.5 x 3.5 inches |
| Item Type Name | Back Plate |
| Item Weight | 9.07 g |
| Lock Type | Rim Lock |
| Manufacturer | Prime-Line Products |
| Manufacturer Part Number | U 9517 |
| Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. |
| Material Type | Alloy Steel |
| Model Name | 3-1/2 in. Chrome plated Back Plate (2 pack) |
| Model Number | U 9517 |
| Number of Items | 1 |
| Number of Packs | 2 |
| Number of Pieces | 2 |
| Recommended Uses For Product | Door installation, renovation, or repair |
| Shape | Round |
| Style Name | Modern |
| UPC | 049793095176 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Defender Security
- **Item dimensions L x W x H:** 0.06 x 3.5 x 3.5 inches
- **Lock Type:** Rim Lock
- **Material:** Alloy Steel
- **Special Feature:** Weather Resistant

## Images

![Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack) - Image 1](https://m.media-amazon.com/images/I/61VdvsN+zvL.jpg)

## Questions & Answers

**Q: How thick is the plate?**
A: The thickness is 3/64" or .046875 or 1.1906mm.

**Q: Will it work with a standard kwikset entry door knob?**
A: Yes, it fits a standard handle that has a 2 1/8" bore hole.

**Q: Is this product good for covering the extra holes left by the large rosette ADA locksets ?**
A: Depending on the size of the hole from the previous rosette, it can be sandwiched between the new rosette and the door itself to cover up holes and marks and allow smaller hardware something to grip when the new set screws are tightened down.

**Q: what is the interior diameter?**
A: ID = 2 1/8 inches

## Frequently Bought Together

- Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)
- 4pcs Door Reinforcement Plate, Door Handle Fixing Cover Filler Repair Backplate Stainless Steel Door Lock Repair Plate Door Lock Repair kit
- Probrico 10 Pack Keyed Alike Entry Levers, Wave Style Satin Nickel Entry Locksets, Exterior Interior Door Levers with Lock and Same Keys(for Bedroom or Office)

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**Shop now:** [https://www.desertcart.pt/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated](https://www.desertcart.pt/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-10-29*