Model # U 9800

Internet #100212527

Store SKU #496404

Prime-Line Aluminum Sliding Window Lock with Thumbscrew


Aluminum Sliding Window Lock with Thumbscrew

$279 /each
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Frequently Bought Together

Product Overview

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
  • For horizontal sliding aluminum windows
  • Pliers may be used for extra tightening

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.

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Customer Questions & Answers

Is this product for horizontal or vertical sliding windows?

What models are specifically designed for windows that open up and down vs sliding horizontally?
Asked by: TA
Thank you for your inquiry regarding this item from Prime-Line Products. This item is designed for sliding windows manufactured with metal frames, and it can be used on both horizontal and vertical sliding windows. There are multiple locks that are designed for use with vertical sliding windows, but there are too many to list. Please feel free to contact Prime-Line Products directly where a Customer Service Representative there can better assist you with your inquiry. You may also send photos in for us to visualize precisely what you are inquiring about. All items manufactured by Prime-Line Products can be special ordered at your local Home Depot. For additional questions regarding this item, or any other product manufactured by Prime-Line Products, please call their toll free number at (877) 649-9740, or contact them by email at
Answered by: primelineProductExpert
Date published: 2015-10-20
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Customer Reviews

Aluminum Sliding Window Lock with Thumbscrew is rated 3.5 out of 5 by 4.
Rated 1 out of 5 by from 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.
Date published: 2013-05-30
Rated 4 out of 5 by from fine the only thing is i wish the screw went in straight insted of at a angle..
Date published: 2012-01-11
Rated 4 out of 5 by from EZ to use, lock freak. Locks, locks on everything so EZ on and off is important.
Date published: 2009-08-27
Rated 5 out of 5 by from 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.
Date published: 2013-09-09
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