---
product_id: 19495065
title: "Prime-Line U 9912 Keyed Chain Door Guard, 3-1/4 In., Steel and Diecast Construction, Brite Brass-Plated Finish (Single Pack)"
brand: "prime-line"
price: "1223264₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Prime Line"
url: https://www.desertcart.vn/products/19495065-prime-line-u-9912-keyed-chain-door-guard-3-1
store_origin: VN
region: Vietnam
---

# Corrosion-resistant bright brass finish Keyed lock for enhanced security Easy installation with included hardware Prime-Line U 9912 Keyed Chain Door Guard, 3-1/4 In., Steel and Diecast Construction, Brite Brass-Plated Finish (Single Pack)

**Brand:** prime-line
**Price:** 1223264₫
**Availability:** ✅ In Stock

## Summary

> 🔒 Elevate your entryway security with style and peace of mind!

## Quick Answers

- **What is this?** Prime-Line U 9912 Keyed Chain Door Guard, 3-1/4 In., Steel and Diecast Construction, Brite Brass-Plated Finish (Single Pack) by prime-line
- **How much does it cost?** 1223264₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/19495065-prime-line-u-9912-keyed-chain-door-guard-3-1)

## 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

- • **Hassle-Free Setup:** Comes with all necessary mounting hardware and requires just a Phillips screwdriver for quick, no-fuss installation.
- • **Secure with Style:** Durable steel chain and diecast housing wrapped in a sleek brass-plated finish that resists corrosion and elevates your door’s look.
- • **Child-Safe Placement:** Mounts out of reach to prevent little ones from wandering into unsafe areas, giving peace of mind to busy parents.
- • **Controlled Access, Always:** Key-operated lock mechanism ensures only you decide when to open, adding a trusted layer of security to your home.
- • **Breathe Easy & See Clearly:** Allows your door to open slightly for safe viewing and ventilation without compromising security.

## Overview

The Prime-Line U 9912 Keyed Chain Door Guard is a compact, 3-1/4 inch security device crafted from durable alloy steel and diecast components, finished in corrosion-resistant bright brass. Designed for inward-swinging hinged doors, it features a keyed lock mechanism (B1 keyway) that allows partial door opening for safe viewing and ventilation. Easy to install with included hardware and positioned out of children's reach, it offers an effective, stylish solution for enhanced home security and child safety.

## Description

This chain door guard is constructed of a steel chain, diecast housing, plate and keeper, and it comes in brass-plated finish. This lock engages by allowing the bolt to slide into the keyed mechanism to lock, and it uses a B1 keyway, ILCO (1098M). This chain door lock allows a door to open slightly for safe viewing and ventilation. Installation of this lock placed out of children’s reach will help prevent them from opening a door themselves to enter or exit into dangerous areas. All installation fasteners are included, and it can be used on a variety of door types, on or beside the door casing.

Review: Good product, easy installation - Good quality and gets the job done. I added this as an extra layer of protection and it works well. It was easy to install.
Review: Every little deterrent helps! - Easy to install and a good product.

## Features

- This Chain Door Guard is a security locking device that allows doors to slightly open for safe viewing and ventilation
- All components come in a beautiful, corrosion resistant, bright brass-plated finish
- Designed for use on hinged entry doors that swing inward, into the dwelling
- Mounts out of children's reach to help prevent them from opening a door themselves to enter or exit into dangerous areas
- Easy to install, key-operated lock can be mounted on, or beside the door casing, mounting hardware included
- Durable welded steel chain with a bolt that slides into keyed mechanism to lock. Uses B1 keyway, ILCO (1098M)
- A Phillips head screwdriver is required for installation
- Please refer to the line art drawing for dimensions and compare with your needs before ordering

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000R9YY9W |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #245,432 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #539 in Door Latches & Bolts |
| Brand | PRIME-LINE |
| Color | Brass |
| Controller Type | Hand Control |
| Customer Reviews | 4.7 4.7 out of 5 stars (121) |
| Date First Available | May 25, 2007 |
| Finish | Brass |
| Finish Type | Brass |
| Global Trade Identification Number | 00049793099129 |
| Included Components | Hardware; Door Knobs & Lock Sets;door-chains |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 9.6 ounces |
| Item dimensions L x W x H | 1.38 x 3.25 x 1.37 inches |
| Item model number | U 9912 |
| Lock Type | Keyed |
| Manufacturer | Prime-Line Products (Home Improvement) |
| Material | Alloy Steel |
| Model Name | U 9912 |
| Number of Pieces | 1 |
| Part Number | U 9912 |
| Product Dimensions | 1.38 x 3.25 x 1.37 inches |
| Recommended Uses For Product | Door security, child safety, ventilation, and viewing |
| Shape | Rectangular |
| Size | 3-1/4 in. |
| Special Feature | Key Lock |
| Special Features | Key Lock |
| Style | Modern |
| UPC | 049793099129 |
| Usage | specific_uses_for_product |
| Warranty Description | Goods are warranted against manufacturing defects for 1 year. |

## Product Details

- **Brand:** PRIME-LINE
- **Item dimensions L x W x H:** 1.38 x 3.25 x 1.37 inches
- **Lock Type:** Keyed
- **Material:** Alloy Steel
- **Special Feature:** Key Lock

## Images

![Prime-Line U 9912 Keyed Chain Door Guard, 3-1/4 In., Steel and Diecast Construction, Brite Brass-Plated Finish (Single Pack) - Image 1](https://m.media-amazon.com/images/I/61F+DlHkgYL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product, easy installation
*by D***O on November 7, 2025*

Good quality and gets the job done. I added this as an extra layer of protection and it works well. It was easy to install.

### ⭐⭐⭐⭐⭐ Every little deterrent helps!
*by C***D on September 18, 2025*

Easy to install and a good product.

### ⭐⭐⭐⭐⭐ Very good product
*by J***L on August 2, 2025*

Easy to install. Very durable. I used them for my garage door. Definitely will use them again

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**Shop now:** [https://www.desertcart.vn/products/19495065-prime-line-u-9912-keyed-chain-door-guard-3-1](https://www.desertcart.vn/products/19495065-prime-line-u-9912-keyed-chain-door-guard-3-1)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-24*