The default factory code for most standard Master Lock combination padlocks and key storage boxes is 0-0-0-0 (four zeros). Some 3-dial luggage and cable locks use 0-0-0 (three zeros).
The factory-set combination is 0-0-0. Push in the button at the bottom of the lock. While holding in the button, turn the dials to your new combination.
To open a Master Lock when you've forgotten the combination, you can either recover the code yourself by "feeling" the internal mechanisms, look up your code through Master Lock, or use a bypass method.
The default factory code for almost all Master Lock combination locks and lockboxes is 0-0-0-0.
To reset a 4-digit Master Lock, you must first open it using your current combination (or the factory default of 0−0−0−0). The process varies by model, but standard padlocks require you to open the shackle, rotate it 90∘90 raised to the composed with power90∘ or 180∘180 raised to the composed with power180∘, push it down, set your new code, and pull it back up.
To unlock a standard 4-digit code (ranging from 000000000000 to 999999999999), there are 10,000 possible combinations.
If you forgot your combination lock code, start by "feeling for the gates." Pull the shackle (the top metal loop) to create tension. Slowly turn the dials until you feel a drop in resistance or hear a slight click, identifying the correct number for each dial.
Master Lock does not allow you to reset a combination lock without first knowing the current combination. However, you can either recover the lost code or request an official record from the manufacturer.
If you forgot the number for a combination padlock, the fastest way to open it is to apply tension to the shackle (the top metal hoop) while slowly turning the dials until you feel them drop into their "gates."
The default factory code for almost all Master Lock combination locks and lockboxes is 0-0-0-0.
This is typically a small button or hole on the side or bottom of the lock. If your lock has a reset button, press and hold it down. For locks with a reset slot, insert the reset tool provided with the lock. While holding the reset button or tool, set your new combination by turning the dials to your desired numbers.
To reset a Master Lock box when you forgot the combination, you must first get it open. If the box is already open, you can reset the code by flipping the internal reset lever. If it is closed, you will need to find the lost combination first.
To unlock a 3-dial combination lock when you are locked out, you can use the tension-and-feel method to find the code in a few minutes, or try the brute-force method if it has specific vulnerabilities.
If you forgot the combination to your Master Lock, you can recover the code using a simple "feeling" method that works for standard rotary dials, decode multi-dial padlocks, or get the code officially from Master Lock.
Depending on the type of Master Lock you have, you can retrieve the combination using a few different methods.
A standard 4-digit combination lock has exactly 104=10,000 possible combinations, ranging from 0000 to 9999.
To reset a Master Lock, you must know the current combination (or default factory code) to open it first. The exact steps depend on your lock type. Common resettable models like the 4-digit setup use the shackle to change the code, while key-access locks use a specialized tool.
A standard 3-digit combination lock has exactly 1,000 possible codes, running sequentially from 000 to 999. Each of the three dials features 10 digits (0 through 9), making the total number of combinations 10×10×10=1,000.
The easiest things to use for picking a basic pin-tumbler lock are two standard paper clips or a pair of bobby pins. One is bent into a "tension wrench" to apply rotational force, and the other is shaped into a "pick" or "rake" to push the internal pins up.
According to massive analyses of leaked databases and cybersecurity studies, the overall rarest and least-used 4-digit code is 8068. Appearing in only 25 out of over 3.4 million analyzed PINs, it has an incredibly minuscule frequency of about 0.000744%.
The probability of a 4-digit lock code not having all even digits depends on whether the digits can repeat and if zero is included. Under standard conditions for a 4-digit PIN (using digits 0–9 with repetition allowed), the probability is 93.75% (or 15/16).
The 24 possible arrangements (technically called permutations) of the digits 1, 2, 3, and 4 are calculated as 4! (4×3×2×1=24), according to Math Central.
To reset a lock when you forget the code, you first need to open it. Try the "tension method" by gently pulling the shackle and turning the dials until they click, use trial-and-error, or contact the manufacturer for a lost combination. Once open, you can set your new code.
The tool you need to open a lock depends entirely on the type of lock (e.g., pin-tumbler, padlock, or door latch) and your intended method. Options range from lock-picking kits and bypass tools to everyday household items.
Common mistakes include turning the dial too quickly, not resetting the lock properly before starting, and forgetting the exact sequence of numbers. Consistent slow practice helps avoid these errors.