Model # U 9912

Internet #100134951

Store SKU #474806

Prime-Line Brass-Plated Keyed Chain Door Guard


Brass-Plated Keyed Chain Door Guard

$987 /each
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Frequently Bought Together

Product Overview

The Defender Security Brass-Plated Keyed Chain Door Guard is constructed of steel with a brass-plated finish for security and beauty. This lock set has a sliding bolt to lock the mechanism and allows keyed entry from the inside or the outside.

  • Offers viewing and ventilation while helping to secure your door
  • Can be unlocked with the key from the outside or inside
  • Bolt slides into keyed mechanism to lock
  • Brass-plated finish
  • Steel chain and die-cast metal keepers

Info & Guides

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Chain/bar length (in.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)
3.813 in


Door Locks & Knobs Product Type
Hardware Finish Family
Hardware Included
Product Weight (lb.)
0.615 lb
Security/ANSI Grade

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
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

Do you carry this lock in store or do I have to order online?

Asked by: hope532
They have them in the store.
Answered by: perry
Date published: 2017-03-28

What color is this? In the picture it looks silver, but it says brass, which on other chain locks is gold.

In the store I could only find gold ones, but who has gold finishes anymore?
Asked by: Heather
It is actually brass plated they have diferent styles to choose from in the store
Answered by: chasb
Date published: 2015-09-20

Set of 2 U 9912 Chain door guard, keyed alike.

How do I order 2 (or more)U9912 locking chain door guards that are keyed alike? Do I pick them up at the store?
Asked by: Gman
You have to check the number on the package to get the same key lock I found 2 keyed alike in the store after searching a few packages.
Answered by: chasb
Date published: 2016-10-17

How do I get extra keys? I have gone to several hardware stores including Home Depot where I pur...

How do I get extra keys? I have gone to several hardware stores including Home Depot where I purchased this product but they did not have a blank to make another key.
Asked by: elmo
Our apologies for any inconvenience this may have caused you. These locks use ILCO 1098M key blanks and a B1 keyway, and your local Home Depot or locksmith should be able to supply these for copies. Kindly contact an associate at the Pro Desk of your local Home Depot, or the Customer Service line at (800) 430-3376 regarding your question where they may better assist you. 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: 2016-12-29
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Customer Reviews

Brass-Plated Keyed Chain Door Guard is rated 4.7 out of 5 by 17.
Rated 5 out of 5 by from Used this to stop the cats from opening up the doors, sneaky things. I install by putting the wal... Used this to stop the cats from opening up the doors, sneaky things. I install by putting the wall piece long ways since it wouldn't fit in the door. Works like a charm.
Date published: 2017-03-28
Rated 5 out of 5 by from 5 Star Review Rating provided by a verified purchaser
Date published: 2017-04-04
Rated 5 out of 5 by from Money well spent. Money well spent.
Date published: 2017-05-02
Rated 1 out of 5 by from It broke this morning. so disgusted right now - I was rushing , unlocked the other bolts but forg... It broke this morning. so disgusted right now - I was rushing , unlocked the other bolts but forgot about the chain; I yanked it and the piece that has the key entry to the right in the picture, just broke off and fell. the nails are still attached though. I am a 5'3 woman so My yank was not that strong at all. What is the material on this? I've never heard of metal breaking like that. I bought this as a precautionary because im in a garden apartment and maintenance was just coming at any time when I was out with no warning. very upset, would not recommend this at all
Date published: 2016-12-12
Rated 5 out of 5 by from WHY DIDN'T I DISCOVER THIS SOONER?! Sad to say I live at a property full of scoundrels and low-life thieves. So, someone told me about this lock. How great is this invention? A chain lock that can be activated from OUTSIDE of the door. Now, whenever I leave my home, I can be sure that no one is entering my home WITHOUT MY PERMISSION! I will NOT be giving a key to my landlord because that would defeat the purpose, they shouldn't be trying to enter my apartment without my knowledge so, if they say something that will let me know that I have to sue and it also gives people a false sense that someone is home when they really are not. Yessssss! I can't say enough about this product. As for installation, I will say as a single woman, I am NOT handy with a hand drill but, I had to familiarize myself with it. Even though this is a $10 product, the cost of the drill and the bits were almost $30 so, not too happy about that but, still worth it. I'll just have to get more handy around the house. But, overall this is a great buy if you just want people to stay out of places they don't belong :)
Date published: 2012-09-14
Rated 5 out of 5 by from The Best Device Every Invented Many years ago, I had this product and some how misplaced it. Now that I am a senior leaving in a not so secure complex, I made another purchase. It was the best decision ever made. Now I feel secure knowing that no one can walk-in on home or not. Please do not hesitate and give yourself a peace of mine (easy to sign for packages without opening the door; if some is out of peep hole range you still have some security). Believe me, you cannot put a price on feeling save in your own 4 walls.
Date published: 2013-07-17
Rated 5 out of 5 by from got kids! keep em out! I use this to lock the pantry to keep the kids out of the snacks and taking everything out of the pantry. works great for that.
Date published: 2011-08-06
Rated 5 out of 5 by from Perfect Solution I needed an extra lock on both my front and back doors. I could not afford to have a locksmith come and do the installation on my heavy duty metal doors and could not do such a job myself. This is an excellent solution. Very easy to install and use. It has a heavy and sturdy feel even though the price is so low.
Date published: 2016-10-04
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