Model # U 9997

Internet #100179092

Store SKU #601896

Prime-Line Aluminum Keyed Patio Door Header Lock


Aluminum Keyed Patio Door Header Lock

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Product Overview

The Defender Security Aluminum Keyed Patio Door Header Lock has a 1-1/2 in. throw bolt that may be manually or key locked, helping to prevent forced entry. It may be locked in a ventilating position as well.

  • Prevents forced entry of your patio door
  • 1-1/2 in. bolt throw can be locked manually or with a key
  • Cast-zinc housing with painted aluminum finish
  • 5/16 in. diameter steel bolt
  • Note: product may vary by store

Info & Guides

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Bore diameter (in.)
Product Depth (in.)
1 in
Product Height (in.)
8.438 in
Product Width (in.)
3.813 in
Required door thickness (in.)
1 3/8 to 1 3/4


Backset size (in.)
Commercial / Residential
Commercial / Residential
Product Weight (lb.)
0.68 lb
Safety & Security Product Type
Lock & Door Reinforcer

Warranty / Certifications

Manufacturer Warranty
Goods are warranted against manufacturing defects 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

Defender security patio sliding door lock U-9997 can this lock be mounted oa vinyl door?

Defender security patio sliding door lock U-9997 can this lock be mounted oa vinyl door?
Asked by: Dan
Yes, with the metal framework embedded within the vinyl extrusions, the lock should mount securely to the back edge of the door.
Answered by: primelineProductExpert
Date published: 2017-07-12

Is this lock exterior grade?

Asked by: steve
Hello Steve, and thank you for your inquiry regarding this item from Prime-Line Products. This lock is "exterior grade" in the fact that it is designed for use with a patio sliding door, which is considered an "exterior door" because its normally installed on perimeter walls. However, this lock is not designed to be used outdoors, as an exterior-exposed locking device... if that makes sense? This keyed patio door header lock is designed for installation on the interior side of an exterior sliding patio door. 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: 2016-10-13
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Customer Reviews

Aluminum Keyed Patio Door Header Lock is rated 3.8 out of 5 by 4.
Rated 5 out of 5 by from Patio door lock The lock is very easy to install,and it is out of reach for small kids, I have a swimming pool plus small grand kids and this lock works great, it has a large throw so it hold the door secure and with the key I don't worry and more when the kids come over for a visit,
Date published: 2011-05-03
Rated 2 out of 5 by from cheaply made I've bought 3 of these; one as a replacement. Just had another one break at the bottom (the same place as the other), the hinges are cheap rivets. I've had each for a few months. I'll be replacing the remaining functioning one when it breaks, which shouldn't be long.
Date published: 2014-08-30
Rated 5 out of 5 by from Well worth it! We noticed this when looking for a good lock because we have a 17 month old son. Upon viewing the box, we decided that this was an excellent find and purchased it. It was easy to install, and is definitely out of reach of little hands trying to escape. It also made the door, when closed and locked, that much tighter, than the door lock on the patio door. We don't really use the key as we use it primarily for keeping our son inside.
Date published: 2012-08-26
Rated 3 out of 5 by from Good But NOT for the Outside use This product is good, but not for exterior use. It has not even been 90 days and it will NOT latch up. I took it off, and it is jammed inside. So back it goes. I will probably try the competitors lock that states it is for interior or exterior.
Date published: 2012-10-23
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