Model # U 9823

Internet # 100577469

Store SKU # 140872

Aluminum Secondary Window Locks (4-Pack)

$3.74 /each

Frequently Bought Together

Product Overview

These Defender Security Secondary Window Locks (4-Pack) secure your window in an open, ventilating position. The locks will fit rails up to 1/8 in. wide. The lock comes in brilliant white. Extruded aluminum lock with steel thumbscrew used on metal horizontal sliding windows. For heavier-duty locks see item no’s U-9800, U-9802, U-11127, U-11128, U-9810 or U-9812. Finish by tightening thumbscrew with pliers to securely lock windows in closed or ventilating positions. For non-marring locks see no’s U-9820, U-9821, U-10876 and U-10551. For vinyl windows use U-9809 or U-10547.

  • Fits rails up to 1/8 in. thick
  • Aluminum construction with white finish
  • Allows window to lock in ventilating position
  • Secondary lock
  • Easy to install

Info & Guides

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Product Depth (in.) 
1.125 in 
Product Height (in.) 
5.438 in 
Product Width (in.) 
3.813 in 


Builders Hardware Product Type 
Window Sash Lock 
Finish Family 
Hardware Included 
Key lock 
Package quantity 
Sliding window lock 
Window Repair Type 

Warranty / Certifications

Manufacturer Warranty 
Goods are warranted against defects in manufacturing for 1 year. In no case is Prime-Line responsible for user related damage or damage incurred during installation. Warranty is void if products are subjected to abnormal conditions, misapplication or abuse. 

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Customer Questions & Answers

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Customer Reviews

Rated 3.3 out of 5 by 3 reviewers.
Rated 1.0 out of 5.0 by Don't buy Cannot use it, got struck with the paint. Need to return them. May 17, 2016
Rated 5.0 out of 5.0 by It does what it's intended to do I have some "insecure" storm windows in my sun room that someone was able to push in slightly to get them open by knocking the lock out of the track to get into my home. I am using these to help secure the windows in place. I used similar clamps in a house I rented a few years back for added security on cheap windows that could easily be pushed in far enough for the "default lock" to be defeated. These keep the window from then being slid open once the built in lock's been knocked out of it's track. They're nice for a little added security, especially for the price, it doesn't make sense not to have them. But I don't think they really replace quality locks on quality windows in the long run. :) April 17, 2012
Rated 4.0 out of 5.0 by Matches most windows, ez on and off EZ on and off. Matches white alum windows. The average builder's home window is rather cheap so it is what it is! August 27, 2009
  • 2016-07-27 T15:13:49.474-05:00
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