---
product_id: 14922455
title: "Prime-Line U 10309 Swing Bar Lock for Hinged Swing-in Doors Secondary Security Lock, 3-7/8 in. Bar Length, Diecast Zinc Construction, Classic Bronze Finish (Single Pack)"
brand: "prime-line"
price: "85.91 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Prime Line"
url: https://www.desertcart.tn/products/14922455-prime-line-u-10309-swing-bar-lock-for-hinged-swing
store_origin: TN
region: Tunisia
---

# 3.88 in. swing bar length Child-safe installation option Diecast zinc for durability Prime-Line U 10309 Swing Bar Lock for Hinged Swing-in Doors Secondary Security Lock, 3-7/8 in. Bar Length, Diecast Zinc Construction, Classic Bronze Finish (Single Pack)

**Brand:** prime-line
**Price:** 85.91 DT
**Availability:** ✅ In Stock

## Summary

> 🔐 Elevate your door’s defense with style and peace of mind!

## Quick Answers

- **What is this?** Prime-Line U 10309 Swing Bar Lock for Hinged Swing-in Doors Secondary Security Lock, 3-7/8 in. Bar Length, Diecast Zinc Construction, Classic Bronze Finish (Single Pack) by prime-line
- **How much does it cost?** 85.91 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/14922455-prime-line-u-10309-swing-bar-lock-for-hinged-swing)

## 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 Locking:** Install out of reach to prevent accidental door openings by children, enhancing home safety.
- • **Effortless Installation:** Comes with all mounting hardware and plastic shim spacers for quick, hassle-free setup.
- • **Robust Diecast Zinc Build:** Engineered for strength and longevity with a classic bronze finish that elevates door aesthetics.
- • **Secure Ventilation Control:** Allows safe door opening for fresh air without compromising security.
- • **Versatile Security Upgrade:** Ideal for residential and commercial hinged swing-in doors needing secondary security.

## Overview

The Prime-Line U 10309 Swing Bar Lock is a durable, diecast zinc security device designed for hinged swing-in doors. Measuring 3.88 inches in bar length, it enables controlled ventilation while enhancing child safety by restricting door access. Featuring a classic bronze finish and complete with all installation hardware, this lock offers a quick, reliable secondary security solution for both residential and commercial spaces.

## Description

This Defender Security U 10309 Bar Door Lock is a security locking device for hinged swing-in doors, allowing a door to be slightly opened to allow safe viewing and ventilation. This door lock bar can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security. Adding security bar locks for doors is quick and easy. All installation fasteners, including plastic shim spacers for leveling, are included. Strong, durable, and sure to last, these lock bars are constructed of zinc diecast with a classic bronze finish. This lock bar is 3-7/8 inch bar length by 2-1/2 inch height and has a long, hinged bar, which folds over the closed door to engage the catch. For further dimensional information, please see the line drawing.

Review: Simple, Strong, and Elegant Great Extra Security for Any Door - This swing bar lock was exactly what I needed to add an extra layer of security to my front door. It’s sturdy, well-made, and the antique brass finish gives it a classic look that blends nicely with my existing hardware. Installation was straightforward all the screws and pieces were included, and it took just a few minutes to attach. The latch feels solid and gives peace of mind when I want to keep the door slightly open for ventilation without unlocking it completely. Highly recommend this for anyone looking for a durable, affordable, and easy-to-install security upgrade.
Review: Safety latch, not a security latch - Matches my door hardware perfectly. I like that this came with two plastic spacers for uneven mounting surfaces. It came with some longer screws which is good but I have French style double doors so these screws would just go straight through the doors. I had some #8 wood screws that worked just fine. I bought this because my 3 year old now can open the front door by herself. I don’t really see this as a good security latch but more like a baby gate. Nothing against this product, but I don’t have full confidence in these style of latches for security. They’re definitely better than the old chain style latches but I think these will easily be kicked in if tested. The chain style latches could easily be cut with cheap bolt cutters that cost less than $20. That would not be the case with this latch. Be sure to drill pilot holes for the screws I used the recommended 7/64 bit for the pilot holes. Worked perfectly.

## Features

- SECURITY LOCK: This swing bar lock is a security locking device for hinged swing-in doors, allowing a door to be slightly opened to allow safe viewing and ventilation
- CHILD-SAFE SECURITY DEVICE: This swing bar door 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: Adding a security swing latch to your door is quick and easy; all installation fasteners, including 2 plastic 1/8 shim spacers for offset door jambs
- STRONG AND DURABLE: Constructed of zinc diecast with a classic bronze finish, the security door lock is strong, durable, and sure to last
- DIMENSIONS: This locking bar is 3-7/8 inch bar length x 2-1/2 inch height and has a long, hinged bar, which folds over the closed door to engage the catch; for further dimensional information, please see the line drawing
- VERSATILE APPLICATION: Suitable for residential and commercial hinged swing-in doors requiring secondary security measures and controlled access
- COMPLETE HARDWARE INCLUDED: Comes with all necessary mounting hardware and fasteners for immediate installation without requiring additional purchases

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003ZGIEZY |
| Additional Features | Child-Safe Viewing and Ventilation |
| Best Sellers Rank | #27,848 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #67 in Door Latches & Bolts |
| Brand | PRIME-LINE |
| Brand Name | PRIME-LINE |
| Color | Bronze |
| Controller Type | Hand Control |
| Customer Reviews | 4.5 out of 5 stars 2,533 Reviews |
| Finish Types | Classic Bronze |
| Global Trade Identification Number | 00049793103093 |
| Included Components | Swing lock, keeper and fasteners |
| Item Dimensions | 3.88 x 0.88 x 2.5 inches |
| Item Type Name | Swing lock |
| Item Weight | 0.46 Pounds |
| Item dimensions L x W x H | 3.88 x 0.88 x 2.5 inches |
| Lock Type | Non-Keyed Lock |
| Manufacturer | Prime-Line Products (Home Improvement) |
| Manufacturer Part Number | U 10309 |
| Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. |
| Material | Diecast |
| Material Type | Diecast |
| Model Name | Swing Bar Door Guard |
| Model Number | U 10309 |
| Number of Pieces | 1 |
| Recommended Uses For Product | Securing hinged swing-in doors, providing child-safe door security, and using it as a door closer in commercial settings Recommended Uses For Product Securing hinged swing-in doors, providing child-safe door security, and using it as a door closer in commercial settings See more |
| Shape | T-Shaped |
| Smart Home Compatibility | Not Smart Home Compatible |
| Special Feature | Child-Safe Viewing and Ventilation |
| Style Name | Classic |
| UPC | 049793103093 |
| Unit Count | 1.0 Count |

## Product Details

- **Material:** Diecast
- **Brand:** PRIME-LINE
- **Color:** Classic Bronze
- **Exterior Finish:** Bronze
- **Product Dimensions:** 3.88"L x 3.88"W x 2.5"H

## Images

![Prime-Line U 10309 Swing Bar Lock for Hinged Swing-in Doors Secondary Security Lock, 3-7/8 in. Bar Length, Diecast Zinc Construction, Classic Bronze Finish (Single Pack) - Image 1](https://m.media-amazon.com/images/I/61WgHQ+aAqL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple, Strong, and Elegant Great Extra Security for Any Door
*by B***R on November 1, 2025*

This swing bar lock was exactly what I needed to add an extra layer of security to my front door. It’s sturdy, well-made, and the antique brass finish gives it a classic look that blends nicely with my existing hardware. Installation was straightforward all the screws and pieces were included, and it took just a few minutes to attach. The latch feels solid and gives peace of mind when I want to keep the door slightly open for ventilation without unlocking it completely. Highly recommend this for anyone looking for a durable, affordable, and easy-to-install security upgrade.

### ⭐⭐⭐⭐⭐ Safety latch, not a security latch
*by A***R on August 1, 2020*

Matches my door hardware perfectly. I like that this came with two plastic spacers for uneven mounting surfaces. It came with some longer screws which is good but I have French style double doors so these screws would just go straight through the doors. I had some #8 wood screws that worked just fine. I bought this because my 3 year old now can open the front door by herself. I don’t really see this as a good security latch but more like a baby gate. Nothing against this product, but I don’t have full confidence in these style of latches for security. They’re definitely better than the old chain style latches but I think these will easily be kicked in if tested. The chain style latches could easily be cut with cheap bolt cutters that cost less than $20. That would not be the case with this latch. Be sure to drill pilot holes for the screws I used the recommended 7/64 bit for the pilot holes. Worked perfectly.

### ⭐⭐⭐⭐⭐ Works good and very easy to install
*by L***I on November 15, 2025*

Easy to install. Works great. I tested it out after installing and it held very well.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-09*