How to Crack a Sentry Safe Combination Lock

Sentry safes are one of the most popular types of home security products on the market today because they’re cheap, effective, and easy to use.

However, many people don’t know that their model also features a weak combination lock that can be cracked in just seconds by an experienced hacker, allowing entry into the safe’s contents without even picking it up!

This article will teach you how to crack a Sentry safe combination lock in under 60 seconds without any special tools so you can keep your valuables secure and protected from would-be thieves and intruders.

What Is A Sentry Safe?

A safe is a place that houses important and sensitive information or items. If you are looking for safety, then there are many different options from which you can choose.

However, not all safes offer the same level of security. Different people will have their own requirements when choosing what kind of safe they want and how secure it needs to be. Some of these people will want a sentry safe.

Why Would I Ever Want To Crack It?

Obviously, you’re not going to want to crack it for nefarious purposes. You might need access for some other reason.

Maybe you have something locked inside that you need access to, perhaps photos, documents, or even valuables, and now that key is nowhere to be found.

Either way, it can be frustrating trying to get at what’s inside your safe without knowing how exactly how many numbers and what sequence they go in.

That’s where we come in with our handy guide on cracking a sentry-safe combination lock. Trust us; it’s easier than you think! If you can do simple math, you should be able to solve these puzzles with ease—and quickly, too.

Preparing The Tools

The tools needed for cracking a safe are very simple. At most, you will need to purchase an assortment of drill bits and secure them onto one drill. The more boring bits you have, the easier it will be for you to crack open your safe.

Don’t worry about purchasing high-end drills, since any good enough drill will do for cracking open your safe.

In addition, pick up some bolt cutters and pliers; these two items will help make sure that everything is within reach once you start drilling into your safe.

If you aren’t comfortable with making purchases online, head down to your local hardware store and buy these things there instead! Make sure that everything is easy to transport. You never know when they might come in handy!

You can crack a Sentry Safe combination lock in five minutes or fewer. All you need is a few common household items and a little bit of determination.

Here’s How it Works:

Method 1: Use a Drill

Use Drill safe

Drilling into the lock is perhaps one of the most effective ways to open a safe, but it’s also likely to damage both the lock and your safe if done incorrectly.

The first thing you’ll need to do is remove the entire lock from inside the safe with an air chisel or other pry tool. Once that’s done, you’ll need to drill through from below to access all of its moving parts at once.

Once inside, you’ll be able to see exactly how each part moves when turned or pushed on by force. This will allow you to determine exactly which parts need adjusting so they will align properly when closed or opened again after being hit with force.

Method 2: Find the Serial Number

Go to and enter the serial number into their “Retrieve Your Combination” option. If you don’t have the serial number, look inside your safe or check the back of your manual (if available).

Enter your birth date and the combination should be revealed right away. If not, try entering your birth year (if available) and then try again with your birth month (if available).


So if you’ve ever wondered how to open a sentry gun safe, wonder no more. We’ve provided an explainer with all the steps needed to open it, including what you’ll need and some helpful tips that will save time during your attempted cracking of the box.


Hi, my name is Robert Blair. I’m the chief editor of Best Safes Ever. Again I'm a home and gun safe expert in New Jersey. I worked under champion safecracker Jeff Sitar for many years and learned practically a lot about safes and how to crack them. I am still examining and researching daily different kinds of safes to help our clients as a physical security specialist.