Message to Our Customers


Model # U 9800

Internet # 100212527

Store SKU # 496404

Aluminum Sliding Window Lock with Thumbscrew

This item has been discontinued.
The Home Depot no longer carries this specific product.

$2.79 / each



Model # U 9800

Internet # 100212527

Store SKU # 496404

Heavy-duty extruded aluminum lock with steel thumbscrew for use on metal horizontal sliding windows. For a non-heavy-duty lock see item no. U-9980 or U-9982. Finish by tightening thumbscrew with pliers to securely lock windows in closed or ventilating positions. For a non-marring lock see U-9820, U-9821, U-10876 and U-10551. For vinyl windows use U-9809 or U-10547.

  • Heavy-duty cast aluminum construction
  • Securely locks window in a closed or ventilating position
  • Utilizes a single thumbscrew to mount onto window track
  • Easy to install

Info & Guides

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Product Depth (in.) 
0.875 in 
Product Height (in.) 
5.438 in 
Product Width (in.) 
3.813 in 
Builders Hardware Product Type 
Window Sash Lock 
Finish Family 
Silver Metallic 
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. 


Rated 3.5 out of 5 by 4 reviewers.
Rated 5.0 out of 5.0 by The locks secured all my windows fast, easily, and inexpensively Each of my horizontally sliding windows have cheap plastic latches that are identical to Prime-Line Sliding and Vertically-Hung Window Latches (Model # F 2589). The plastic latches can be easily broken by prying the window open with a knife, flathead screw driver, etc. Since I'm a renter, I didn't want to remove the cheap plastic latches and upgrade them with the metal ones (Model # F 2589). So I decided to install removable secondary locks at the top track and bottom track of each closed window. Now my windows are secure as ever. Best of all, I can leave my windows slightly opened and reposition these secondary locks at a venting position. That way, no one can open my window any further than I have repositioned the secondary locks. Although the screws did leave a slight pointed imprint on my window tracks (from applying torque with pliers), they did not harm my window tracks or penetrate through them. If you are looking for a non-marring similar lock, you can try U-9820, U-9821, U-10876 and U-10551. Those locks will not put holes in your track, no matter how much you torque the screws. But they may also break if you apply too much torque because they are not heavy duty like these are. Tips: If you are worried about someone sticking their arm through an opened window and undoing thumb screws manually...ALWAYS tighten screws with pliers. Pliers give you more torque that your hands can't. A burglar would have to be superman to manually undo pliers-applied torque. If that's not secure enough for you, just remove thumb screws and purchase same size screws with heads that require specific tools to remove (torx, 7 node, spanner drilled, etc.). If that doesn't thwart a burglar, nothing will. September 9, 2013
Rated 4.0 out of 5.0 by fine the only thing is i wish the screw went in straight insted of at a angle.. January 11, 2012
Rated 4.0 out of 5.0 by EZ to use, lock freak. Locks, locks on everything so EZ on and off is important. August 27, 2009
Rated 1.0 out of 5.0 by Did not work. . .junk for me Not only did this not work for my windows (apparently there isn't enough space for it to lock on), it actually damaged my window. The screw thing basically put a hole halfway through my frame. You might say, wait, why did you screw it that tightly. I did so because when it wasn't tight, I was able to easily lift and open my window up and past this "lock." Junk. May 30, 2013
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