The Best Heavy Duty Deadbolt Locks – Reviews Of Schlage, Medeco, and More!

When it comes to deadbolt locks, you might assume that all deadbolts are “heavy duty”, right?  Wrong.  Have you heard of ANSI? 

heavy duty deadbolt locksANSI stands for the American National Standards Institute, and you can read more about them at the tail end of this review.

Basically, without ANSI, any company could claim their locks to be heavy duty. Luckily, ANSI has a strict code for what qualifies as a strong or heavy duty lock, with grades being given out based on rigorous testing.

In this review, we wanted to talk about some of the absolute toughest deadbolts on the market, which ANSI labels as Grade 1 deadbolts. Literally, to get past one of these deadbolts would be quite a feat, since Grade 1 deadbolts are used in the most high security situations.  Your average burglar cannot get past them.  They would have an easier time going through your wall.  

Each of the following heavy duty deadbolt locks have received an ANSI Grade 1 rating, which means there aren’t any tougher deadbolts than these available to consumers. Here are the deadbolt lock reviews of 5 of the best heavy duty deadbolts on the market.

Schlage B60N 619 Single Cylinder Deadbolt

Schlage is one of, if not the top shelf maker of deadbolts out there today, and their B60N 619 cylinder deadbolt is made to withstand anything, as you will see in this quick review.

Schlage B60N 619 Single Cylinder Satin Nickel Deadbolt

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This Schlage ANSI-Grade 1 deadbolt has a keyhole on the exterior of the lock and a thumb turn on the interior.  It is simple to use, looks great, and is meant to provide an added layer of high security to any door.

The installation of this deadbolt is quite easy due to the special “Snap ‘n stay” design which keeps the lock held in place. 

The Schlage B60N 619 will fit into any standard size door, and is designed to fit pre-drilled holes.  It comes complete with an adjustable universal latch which fits 2-3/8″ or 2-3/4″.

Once again, this Grade 1 ANSI/BHMA deadbolt is designed specifically to ward off any type of brute force attack including crowbar, hammer, saw, wrench, lock pick, or kick in.

Medeco Maxum Residential Bump Proof Deadbolt

Medeco is a trusted name in deadbolts, and this Maxum 11TR50319 is their #1 model designed for maximum residential security, complete with triple-locking security featuring a Medeco 3 cylinder.

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With an updated look, the Medeco Maxum 11TR50319 has a keyhole on the exterior with a thumb turn on the inside of the lock.  

This lock has been designed to be pick and bump proof, which is a huge advantage these days as these types of “attacks” have become more widespread.

This ANSI Grade 1 Medeco lock will fit all doors that are 1-3/4″ to 2″ thick, and includes two Medeco 5-pin security keys.  It is also UL437 listed.

We feel that no list of heavy duty locks would be complete without this one, and Medeco locks are one of the few deadbolt manufacturers who can compete with Schlage in terms of being the best of the best.

Read our full review of the Medeco Maxum deadbolt

Schlage Connect Century Deadbolt

Well well, here we are once again with another Schlage deadbolt which is rated ANSI Grade 1, except that this one is a touch screen model.


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The Schlage Connect Century deadbolt that we got our hands on has a matte finish, with a highly durable and resistive touch screen which is protected against any sort of smudges or fingerprints.

With an anti-pick shield to protect against any kind of lock tampering, the Schlage Connect Century comes in a variety of finishes, including Aged Bronze, Bright Brass, Bright Chrome, Matte Black, Satin Chrome, Satin Nickel.  Each brings a whole new look to this lock.

This is a fully automated deadbolt which unlocks or lock only if the correct user code is entered.  It has built-in alarm technology, and sends an alert to the property owner if it detects a problem.  

Each package comes with a single back-up key, 4 AA batteries, as well as a user guide and instructions for installation.

Read our full review of the Schlage Connect Century deadbolt


C.R. LAURENCE D50ENTBN CRL Brushed Nickel Heavy-Duty Grade 1 Lever Locksets Entrance - Schlage 6-Pin
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Featuring a Schlage ‘C” 6-pin keyway, this Grade 1 ANSI lock by manufacturer C.R. Laurence is completely resistant to any kind of forced entry.  

The look of this lock is a little different, so it may not be suitable for your front door, and may be more suitable for a closet, office, or some other type of business application.

The D50ENTBN CRL a non-handed, reversible lock which has a special “clutch” feature which will disengage the out lever when the latch is locked.

It is also worth noting that this lock has a 3 year warranty and is UL listed.

To Know Heavy Duty, You Have To Know ANSI

If you want some historical context, here’s a video that will give you an idea who ANSI is, and why we need them.

When it comes to deadbolts, as our friends over at Schlage tell us in their grading guide, there are basically three ANSI grades when it comes to locks. 

The difference between 1, 2, and 3 relates to testing which has been done that talks about how much force can be put on a deadbolt before it gives in. 

Without putting you to sleep from boredom, here is a breakdown for what the different ANSI Grades mean.  Worth a read…

Mid Grade Vs. Heavy Grade

deadbolt security grades

ANSI Grade 1

Usually this grade is reserved for commercial applications, or high-level residential applications where the most secure locks are often needed. 

A Grade 1 lock has been tested for one million open/close cycles and has a 1 inch latch bolt. 

A Grade 1 lock can also withstand ten strikes of seventy-five lbs. of force / one hundred fifty foot-pounds.

ANSI Grade 2

These are considered “mid-grade” locks, and are priced slightly lower than a Grade 1 lock. 

That said, Grade 2 locks can be used for both commercial and residential applications, and are tested for 800 000 open/close cycles with a 5/8 inch latch bolt. 

A Grade 2 lock can withstand five strikes of seventy-five lbs. of force / one hundred twenty foot-pounds.

ANSI Grade 3

Considered a “secondary” security measure for a residential door. 

Grade 3 locks are meant to withstand 800 000 open/close cycles and have a 5/8 inch latch bolt.  They can also handle two strikes of seventy-five pounds of force or ninety foot-pounds.

Here’s a video that will give you a real appreciation for what we’re talking about here in regards to those open/close cycles.

Now here is a video (below) from Medeco which gives us an idea how these ANSI Grades actually go into practice, eg. intruders attempting to break in via brute force. 

If you are looking to purchase a “heavy duty” deadbolt, be sure to check out the lock’s UL listing as well.  This will indicate the underwriter laboratories standards when it comes to your deadbolt. 

The best and most heavy duty deadbolts have a rating / UL listing of 437, which certifies that the lock meets all standards for overall toughness and security.


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