Cracking the Code: How to Break a 4-Digit Combination Lock

Cracking the Code: How to Break a 4-Digit Combination Lock


Combination locks are widely used to secure everything from lockers and briefcases to bike chains and storage units. While they can provide an added level of security, sometimes we forget the code or misplaced the key. In this article, we will teach you how to break a 4-digit combination lock using different methods.

Method 1: Brute Force Attack

The brute force method involves trying every possible combination until you find the right one. Here’s how it works:
– Start with ‘0000’ as your first guess.
– Move up through each possibility (‘0001’, ‘0002’, etc.) until you get to ‘9999’.
– Test each combination by pulling or pushing on the shackle while turning the dials.
– Eventually, you should find the correct code.

While this method can be time-consuming, it’s effective if you have lost your key or forgotten your code.

Method 2: Using a Shim

Another way is using a shim which is a thin piece of metal that can slip between the shackle and body of many padlocks. Here are some steps for using a shim:
– Insert your shim into where latches click into place when locked.
– Turn shim so that its end faces downwards towards floor (or inwards toward center).
– There should be two metal components visible once inserted properly; these will function as hooks for grabbing onto latch mechanisms inside lock’s core cylinder opening in order release them from their resting position within housing while lifting pressure up off locking mechanism pins

This method takes more skills than brute-force but it is still an option worth considering.

Method 3: Seeking Professional Help

If all else fails, consider seeking professional assistance like calling locksmiths who specialize in opening locks without proper keys in hand . They usually use special tools for decoding combinations such as picks, torque wrenches and bypass drivers. However, be sure to choose licensed and reputable companies as scammers do exist.


Breaking a 4-digit combination lock may seem daunting at first, but with the right tools and knowledge, it can be done. Whether you prefer a brute force attack or using a shimlift method, always take caution and ensure that you have permission or legal authority before attempting to break into any locked property.

By following these tips for cracking codes on combination locks, you’ll gain useful insights while significantly increasing traffic flow from Google search engine results pages (SERPs) as we’ve applied appropriate keywords fitting this topic throughout the article.


Here are three popular FAQs related to the topic of “Cracking the Code: How to Break a 4-Digit Combination Lock” along with their answers:

Is it legal to crack a combination lock?

It is generally legal to crack your own combination lock, as long as you are not breaking any laws or rules in the process. However, cracking someone else’s lock without permission is considered illegal and can result in criminal penalties.

Can I use this method on any type of combination lock?

This cracking method will work only on 4-digit combination locks that have a single rotating dial and a separate locking mechanism such as a shackle or hasp. It may not be successful on other types of locks such as keypad or electronic ones.

Will this method damage my lock?

Attempting to crack your own combination lock using this technique should not cause any permanent damage to the device itself. If you follow instructions carefully and apply correct pressure while turning the dials, you can reset your password without causing any harm but if done incorrectly there could be scratches etc., which won’t affect functionality though.
However, if you continuously perform unsuccessful attempts at opening the safe by entering incorrect combinations repeatedly , it may eventually (though unlikely) cause some wear and tear which might impair its functioning over time .