---
product_id: 267765409
title: "PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack)"
brand: "prime-line"
price: "$5.53"
currency: USD
in_stock: false
url: https://www.desertcart.ec/products/267765409-prime-line-defender-security-u-9909-chain-door-guard-door
store_origin: EC
region: Ecuador
---

# 6-inch, 8-link welded steel chain Easy installation with included fasteners Solid extruded brass with satin chrome finish PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack)

**Brand:** prime-line
**Price:** $5.53
**Availability:** ❌ Out of Stock

## Summary

> 🛡️ Lock in peace of mind with style and strength!

## Quick Answers

- **What is this?** PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack) by prime-line
- **How much does it cost?** $5.53 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/267765409-prime-line-defender-security-u-9909-chain-door-guard-door)

## 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

- • **Child-Safe Design:** Install out of reach to prevent kids from opening the door alone
- • **Hassle-Free Setup:** All necessary fasteners included for quick, tool-friendly installation
- • **Durable Premium Build:** Solid brass and welded steel chain ensure long-lasting protection
- • **Universal Fit & Style:** Compact 3-5/16” size fits most door types with sleek satin chrome finish
- • **Secure Ventilation Control:** Allows safe door opening for viewing & airflow without compromising security

## Overview

The PRIME-LINE Defender U 9909 Chain Door Guard is a robust security device crafted from solid extruded brass with a satin chrome finish, featuring a 6-inch, 8-link welded steel chain. Designed for easy installation with included fasteners, it allows safe door ventilation and viewing while preventing unauthorized entry. Its child-safe placement option and universal fit make it an essential upgrade for home or office door security.

## Description

Full description not available

## Features

- SECURITY LOCKING DEVICE – This U 9909 Chain Door Guard is a security locking device for doors, allowing a door to be slightly opened to allow safe viewing and ventilation.
- CHILD-SAFE SECURITY DEVICE – This door chain lock can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security.
- EASY INSTALLATION - Installation is quick and easy – additional security for your home or office doors are within reach! Installation fasteners are included.
- DURABLE CONSTRUCTION – This chain door guard is constructed of extruded brass with a dull chrome finish and a 6”, 8-link welded steel chain. It’s strong and durable and sure to last.
- PRODUCT INFO – The 3-5/16” U 9909 Chain Door Guard can be used on a variety of door types and can be placed over or beside door casing. It features a 6-inch long, 8-link welded steel chain and all installation fasteners necessary for complete install..For all dimensional information please refer to the line art and compare to your needs before purchasing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Prime-Line Products (Home Improvement) |
| Part number | U 9909 |
| Item Weight | 132 g |
| Product Dimensions | 8.41 x 1.59 x 5.08 cm; 131.54 g |
| Item model number | U 9909 |
| Size | 3-15/16 in. |
| Color | Satin Chrome |
| Style | Standard |
| Finish | Chrome |
| Material | Steel |
| Item Package Quantity | 1 |
| Included components | lock, keeper and fasteners |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack) - Image 1](https://m.media-amazon.com/images/I/514XZaSrPfL.jpg)
![PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack) - Image 2](https://m.media-amazon.com/images/I/51FuGlLGGhL.jpg)
![PRIME-LINE Defender Security U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack) - Image 3](https://m.media-amazon.com/images/I/61dVarMBStL.jpg)

## Available Options

This product comes in different **Color Name** options.

## Questions & Answers

**Q: Do this work on doors with molding?**
A: Yes they do.  I used them on 4 different doors, all with a different kind of molding, and they work absolutely great!!  I'm very pleased with them.

**Q: Would the chain break if someone tried to forcefully enter through the door? (not talking about the screws just the chain)**
A: Yes.  My medium-sized dog tried to get through the door I 'secured' with this, and the anchor at the end of the chain  popped right off.

**Q: Has anyone installed this on a solid wood door? I’m afraid it might split the wood?**
A: Pre-drill the holes.  The quality of the chain was very weak though.

**Q: Instructions for installing door lock?**
A: Easy to install, you just need a screwdriver and it will not protect against strong pressure on the door!  Only if the children do not come out

## Frequently Bought Together

- Prime-Line U 9909 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction and a Dull Chrome Finish (Single Pack)
- EverPlus Home Security Door Lock with 8 Screws, Childproof Door Reinforcement Lock with 3 Inch Stop Withstand 800 lbs for Inward Swinging Door,Upgrade Night Lock to Defend Your Home (Silver)

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**Shop now:** [https://www.desertcart.ec/products/267765409-prime-line-defender-security-u-9909-chain-door-guard-door](https://www.desertcart.ec/products/267765409-prime-line-defender-security-u-9909-chain-door-guard-door)

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-01-23*