Cracking a Combination Lock – Easy and Simple Opening

If you have forgotten the 4-digit combination of your lock, there are two methods to crack your combination lock. With this guide, you will discover how to find the code of any combination lock in just a few seconds! Keep in mind, this skill is intended for legal use only. I share this knowledge purely to help you open your own combination locks for which you have forgotten the code.

You cannot use these techniques for opening regular padlocks (so not combination or digital locks). For that, you will need a lockpick set.

Basic Principles of Cracking a Combination Lock

A combination lock consists of a series of dials, each often having three or four digits. These dials are arranged around a central axis, with a keyhole in the middle of the mechanism.

The first technique is to turn the dials and pay attention to changes in resistance or sound signals that indicate the correct position. This method helps to find the correct combination.

Method 1: Cracking a 4-Digit Combination Lock with Rope

When opening/cracking a combination lock, a piece of rope can be used to create an improvised handle. This gives you better grip on the lock.

Constant pressure on the shackle is crucial when cracking a combination lock. You create friction on the adjustment wheels of the lock. Once an adjustment wheel is turned to the correct number, you will feel a distinct click and a slight upward movement of the shackle.

A clear click is your sign that you are one step closer to opening the combination lock. You can then proceed to adjust the next wheel. Repeat until all wheels are adjusted and the combination lock has been successfully cracked.

Step 1: Finding the Right Number Combination

First, you need to thread the rope through the shackle of the lock. This will be your improvised handle, providing you with a more robust and stronger grip on the lock to facilitate cracking it.

Step 2: Effectively Cracking the Combination Lock

When you hold the rope tightly in your hands, you need to press down as firmly as possible with your thumb on the top of the lock. Make sure to maintain the same pressure on the lock throughout the entire process. While doing this, you should carefully turn each wheel. You will quickly find the digit that is the hardest to turn.

Step 3: Open the Lock!

Start gradually turning the number wheel until you hear a distinct click and feel the shackle move slightly upward. Check the wheel and note the number it clicked on. Then gradually turn the wheel further to check it again. If it consistently clicks on the same number with each turn, you have successfully found the first digit of the code.

Repeat the same process as with the other dials until you have deciphered the second and third numbers of your combination. For the last dial of your combination lock, it is now just a matter of maintaining steady pressure and allowing the remaining dial to make a full rotation slowly. When turning this dial, the shackle of the lock should open.

When the lock opens, you have successfully cracked the code of the combination lock. It may be that your combination lock does not respond to this method. In that case, your success may lie in the second method. With the following method, you will open a combination lock by exploiting another weakness of the lock.

Method 2: Cracking a Combination Lock with a Decoder

For the second method, you will need a very thin piece of metal. This thin piece of metal can then be slid between the casing of the lock and the gear. We have some handy tools from well-known brands to help you with this, namely:

• Sparrows Ultra Decoder
• or the thin metal in some key removal sets

What Happens Inside the Combination Lock?

First, take a good look at how a disc of a combination lock looks. Each disc has internal teeth that can fall into a ring that is inside the combination lock.

Subtly Feeling with Your Decoder

With your thin decoder (only 0.2 mm thick), you will feel along the inner edge of the combination disc. There is a small rotating inner ring (“core ring”) that rotates with the outer disc. This core ring has a small notch that you can clearly feel as you slide your decoder along it.

Recognizing the Notch

When you are turning slowly, you will suddenly feel the decoder drop into a notch. This is exactly the point you are looking for, a tangible click! This point is marked with a blue circle in the next image:

This is How You Gather the Right Digits

For each disc, you do the same. This way, you limit the number of combinations you will need to open the combination lock.

Decoder Technique in Action

Watch closely how the decoder glides along the inside and finds the notch. You will feel a distinct click when the decoder falls into the correct position. This quickly reveals the correct position of all notches. The code discovered here is: 5-5-1. Let’s look at the final step to find out how to crack your code!

With the code 5-5-1, you have reduced the combination possibilities from 1000 to just 10! Turn all the digits together to the next position and test if the lock can open. If the lock does not open at 6-6-2, try 7-7-3 and pull the shackle. If the combination lock does not open, try the next digits until the lock opens!

Success! Any questions?

Yes! The combination was 9-9-5! You will notice that when all the correct grooves are aligned, you suddenly feel a slight movement in the shackle. It almost pops open by itself, a magical moment guaranteed! This is how you discovered the forgotten combination of your combination lock!