Best High Security Deadbolt Locks

The Best High Security Deadbolt.

We are listing the best high security deadbolt locks for residential use. But it is also important to point out that a good deadbolt alone will not deter attacks. Intruders will learn they can’t get past one of these deadbolts and look for some other way to get in.

All deadbolt locks that describe themselves as high security should be certified as Grade 1 locks, the highest grade in the industry. All of these high security locks are easy to install and fit in your existing deadbolt cutout.

These high security residential door locks should be considered a part of an assembly. In this case, these tips to reinforce your door will come in handy. After all, why buy one of these high security deadbolts for security when an intruder can get in just by breaking down the door.

1. Medeco Maxum

The Best High Security Deadbolt.

This Medeco high security deadbolt is the highest rated residential deadbolt. It’s anti-tampering features that this lock has that set it apart from other high security deadbolts. Medeco Maxum deadbolts were first designed for commercial and government use and then developed for residential use.

  • Hardened 1” steel bolt with steel housing provides protection against cutting or drilling
  • Strike plate has a box design and comes with 2” screws (recommend at least 3” long screws)
  • The cylinder – the part with the keyhole – has additional steel inserts for protection against drilling
  • Key cannot be duplicated unless through an authorized locksmith and then only with owner’s authorization
  • Superior pick resistance due to special tumbler pins and a mechanism on the sidebar
  • Some users reported having a little difficulty with installing this lock, mostly enlarging the bore hole.



2. Mul-T-Lock MT5+ Hercular

What is a high security residential deadbolt?

Mul-T-Lock’s newest deadbolt includes their multi-patented MT5+ mechanical key platform. Their previous key platform was the MT5, without the plus, but it was only available in Europe. Now the MT5+ has been released to the North American market and have added a side bar locking mechanism.

UL437 listed cylnder is pick and drill resistant. The lock comes with a keycard which will allow owner to present to an authorized locksmith for copies to be made. This sounds like a good security measure but who will remember where they put this card years later?

  • With the MT5+ keying system you can have the same key for multiple formats – cylinders, padlocks, locks.
  • Patented Alpha Spring at tip of key engages the pin at the back of the keyway providing an additional security measure
  • Comes with Mul-T-Lock key card that is needed by an authorized Mul-T-Lock dealer for replicating keys, to keep copies out of wrong hands
  • Ball bearings in bolt end reduce space in the box in the frame reducing jimmying attacks.
  • Comes with 3″ screws to attach strike plate.


3. Abloy Protec2

The 3rd best high security deadbolt.

The Abloy Protec2 single cylinder deadbolt is manufactured by Assa Abloy, a Swedish lock manufacturer. They’re also the parent company of August smart locks, Yale locks and Sargent exit devices and many others. The Protec2 is Assa’s upgrade to their Protec keying line.

The lock comes with a reinforced steel box for the bolt in lieu of a strike plate. The frame will need a little modification to allow the box to be installed.

  • Abloy rotating detainer disc cylinder allows a large multitude of key combinations
  • Cylinder guard collar spins to deter direct attacks to the cylinder
  • 1″ hardened bolt length
  • Steel strike box is reinforced
  • Bolt comes with protective shield to prevent cutting or sawing


4. Schlage B660P

This is the best high security deadbolt.

This Schlage deadbolt is the best deadbolt in the Schlage door locks family.  The lock has a reinforced metal box strike in lieu of a strike plate and it is attached with the included 3″ screws.

This lock is keyed exterior and thumbturn on interior. For even more security you could get the Schlage B860P that comes with Schlage’s Primus XP UL437 listed high security cylinder that resists many kinds of physical attack.

  • Comes with a metal reinforced box and 3″ screws to attach it.
  • 6-pin keyway
  • 3 hour UL fire rating
  • Patented Everest C123 keyway
  • Optional Interchangeable core and Primus XP high security cylinders
  • Comes in 11 finishes making it easier to match with other door hardware
  • Anti-pick shield around cylinder
  • 1” bolt with hardened steel core


5. Kwikset 980

The 5th best high security deadbolt.

Kwikset and Schlage are the biggest names in residential locks in the United States. Chances are if you do have Kwikset on your door it is not this Kwikset 980 deadbolt.

Kwikset has their patented Smartkey technology allowing you to re-key the lock rather than paying a locksmith. This is very convenient when you find out one of your children lost their key or someone you loaned a key to hasn’t returned it.

Like all the other deadbolts on this list, this deadbolt will fit in a standard deadbolt cutout.

  • Has Kwikset’s patented Smartkey technology which will allow you to rekey the lock yourself in seconds without needing to call a locksmith.
  • The cylinder has stainless steel side locking bar for added security and to protect against bumping the pins into place
  • Can be ordered as a single or double cylinder
  • The least expensive on this list but not as good as the others on this list either.

Author: Bill

11 thoughts on “Best High Security Deadbolt Locks

  1. I never knew such kind of deadbolt lock exisrwhich are very strong and adaptive to every form of external force or pressure. All deadbolt locks that describe themselves as high security should be certified as Grade 1 locks, the highest grade I’m the industry. It’s very durable and it can withstand all forms of external or internal force.

  2. Hi Bill,

    I’ve read your article on the best high-security deadbolt locks with a great deal of interest. I’m feeling the need to increase security at my home due to a rash of break-ins in my neighborhood recently. There seems to be a wide range of prices for these deadbolts. You note that the Kwikset 980 is a lot cheaper but also not as good as the other choices. Feeling safe in your home is incredibly important so I want to make the best choice. Can you tell me which of these models offers the most security? Thanks for the info! 

    1. The best one is the first one in the list, the Medeco Maxum and the price is in the middle of the five on the list. It lists for $143 on Amazon. The Kwikset 980 is $27.71 on Amazon but it doesn’t have all the security features as the Medeco.

  3. What great information you bring to us in this article. I just change my luck from a key deadbolt to an electronic deadbolt. I am telling you, my headaches it over because my daughter lost about 8 key in a period of 24 months; I think this is too much.  

    I wish mine works automatic with my iPhone and Alexa, but not, so I am considering buying “Schlage Smart WiFi Lock tats works with Alexa and ring” as you say in your post.

    Thank you so much for the excellent tips and a great selection of deadbolts you present to us.

    Cheers to your success,


  4. Good thing I have found your post. I’m looking to change the door lock of my front door at home.

    I’m thinking of changing into a security deadbolt lock if I find one that matches my needs.

    I have a wooden door, and the handles are brass so I think I’ll have to go with a brass lock as well.

    I’ll check out the Medeco Maxum on Amazon, I think this is what I am looking for.

  5. Hi Bill,

    Just read through your review and I must say I really find it helpful. Most locks I used in the past and even the current one am using right now are not that reliable. I think I will have to check out one of the locks you mentioned above and see if I can get a positive result.

    I run a small manufacturing paint company and getting a good lock or Security to my warehouse is Paramount. Once again, thanks for enlightening me more in your great post.



  6. Hello Bill,This is a great review on the high-security deadbolt locks.  You mentioned that the Kwikset 980 allows you to re-key and good thing that it is inexpensive.  I remember that I lost my house keys in a very cold winter night and have to pay $150 for a mobile locksmith.  This is great news that I will keep a tab on your deadbolt locks review so that if I need to change my existing locks, this great review will be my resource.Thank you for the helpful information.

  7. Hi Bill! I appreciate this your article on best high-security deadbolt locks. With the high rate of crime these days, one really needs to safeguard his home, and there is no other better way of doing this than using security deadbolt locks that are strong enough to withstand assault from intruders.  Of all the high-security deadbolt you reviewed, I think I like Medeco Maxum, probably because of it being the highest rated residential deadbolt. However, from your experience, do you think that there is one better than the Medeco Maxum among the ones you listed?

    1. No, there is not any lock better than the Medeco Maxum. It is the highest rated and has the best security features of all of them.

  8. What a great article.  The world we live in today can be kind of scary.  Its sad that it is that way but there is no use fighting it because we need to go on living.The fact of the matter is we need to do everything we can to keep ourselves and our family safe.I just want to say thank you for taking the time to write such a great article.  Its a great go to article for locks we may need around our home or precisely on our doors.I happen to be in the market for actually one dead bolt so I am going to take another look at your article and very possibly I may just go shopping.Dale

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