How to Crack a “Master Lock” Combination Lock

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You have a couple choices if you don’t know the combination to a Master Lock combination lock. If your lock is linked to anything, you may break it, hire a locksmith, or use a shim to remove it. These solutions, though, may make a dent in your budget. Sometimes figuring out the combination is the cheapest choice.

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It’s worth noting that a basic 40-digit Master Lock has 64,000 potential combinations for opening it. But don’t let it discourage you. If you don’t know the serial number, you may reduce the number of potential combinations to hack your lock drastically (Method 1). If you have the serial number, you may contact Master Lock directly to get the combination (Method 2).

When You Don’t Know Your Master Lock’s Serial Number

1. To ensure that the dial is clear, turn it at least three times clockwise. Turn the dial of the lock clockwise to zero.

2. Apply pressure to the padlock’s shackle, which is the curved handle at the top. As you squeeze the shackle, carefully turn the dial clockwise (CW). If you can’t turn the dial at all from the zero position, remove the shackle, turn the dial CW a number or two, and try again.

3. Find the initial point of contention.

  • As you turn the dial clockwise with stress on the shackle, you will reach the first clockwise stopping point where you can no longer spin the dial. Make a note of where it ends. Sometimes the dial will get stuck on the numbers, while other times it may become stuck between the numbers. If this is the case, write down the number to the half (example: 22.5).
  • Turn the dial as far left (counter-clockwise) as you can while keeping stress on the shackle. Take notice of the first counter-clockwise (CCW) halt. Your sticking “range” is formed by the CCW and CW stopping points, for example, 22.5 to 10. (Please keep in mind that certain 800XXX and 908xxx locks have a two-number sticking range [for example, 28 to 30 and 10 to 12].)
  • Find the number in the middle of the sticking range to get the initial sticking point. A initial sticking point of 4.5 would be found in a range of 4 and 5. A range of 22.5 to 23.5 would have a first snag of 23.
  • Each pair of numbers you discover will have the same range. For example, one group may be 0.25 to 0.75 on each side of the sticking points, while another may be 0.5 to 0.25.
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4. Turn the dial clockwise slightly beyond the initial sticking point after releasing the shackle tension. Turn the dial counterclockwise approximately one number higher from the initial sticking point to “escape” that sticking point.

5. Reapply strain to the shackle and spin the dial clockwise to locate the remaining sticking areas. You should locate 11 additional sticking spots in one full round of the dial, for a total of 12 sticking points. Make a list of all 12 stumbling blocks.

6. Find the combination’s third number.

  • Examine your list of issues and cross off those that are not whole numbers (that is, cross off any number that ends in 0.5). This step should delete 7 of the 12 numbers.
  • Choose the number with the unique digit in the “1s” position from the remaining sticking places. Four of the remaining five numbers will have the same number in the “ones” location, therefore if the remaining numbers are 4, 14, 24, 27, and 34, the number 27 is the only one that does not have a 4 in the “ones” place. This is the combination’s third number.
  • If you only have four numbers left and they all have the same digit in the “1s” place, refer to the “notice” above in step 3 regarding a 2-number range… the third number in your combination will be the number with a 2-number range (for example, if you have 0, 30, 20, 10 left, but 20 has a range of 19 to 21, that would mean that your third combination number is 20).

7. Determine the magic number. Write down the residual after dividing the third number of the combination (27 in this example) by four.

  • In this situation, 27/4 = 6 rest 3. Remember that the only thing that matters is the residual, which will always be 0, 1, 2, or 3. Your magic number is if the third number in the combo is less than four.
  • The magic number is the remainder. Make a note of it.

8. Determine the combination’s potential first numbers.

  • Increase the magic number by four (3). Make a note of the outcome (7).
  • Add 4 to it and keep adding 4 to each resultant amount until you’ve gone around the dial once. Make a note of each of these numbers.
  • In the above example, the numbers are 3, 7, 11, 15, 19, 23, 27, 31, 35, and 39. One of these numbers is the combination’s first number. (Note: For certain 800XXX locks, the second number of the combination will be this.) The following sequence of numbers will be used as the first)
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9. Determine the combination’s potential second numbers. If your magic number is 0 or 1, multiply it by 2. Subtract 2 from the magic number otherwise.

  • Subtract 2 from the example magic number to obtain 1.
  • Write down the result and multiply it by four. Add 4 to each of the ensuing sums until you have gone around the dial once.
  • The numbers in the example would be 1, 5, 9, 13, 17, 21, 25, 29, 33, and 37. One of these numbers is the combination’s second number.

10. Remove the numbers plus or minus 2 from the combination’s third number. Because 27 is the third number in this case, you may check 25 and 29 off your list of probable second numbers.

11. Determine the best mixture via trial and error. You now know all of the potential first numbers (3, 7, 11, 15, 19, 23, 27, 31, 35, 39), as well as all of the possible second numbers (1, 5, 9, 13, 17, 21, 33, 37). (27). You’ve just reduced 64,000 possible possibilities to merely 80. Try every conceivable combination until you discover the one that works for you.

12. You may use the following to assist find out the initial number on many Master Locks… Apply force to the shackle. As you pull the shackle, gently turn the dial counter-clockwise (CCW). It should stick once every rotation. Take a look at the number when it sticks and multiply it by 5. Find the number you typed down in step 9 for the first digit that is closest to the total. For example, if the lock stays at 17 while spinning CCW, write 17+5=22, then check in the list above and calculate that 23 is most likely the first number of the combination. [It may not work for 800XXX locks, but it’s a nice place to start.]

13. You do not need to clear the lock to test each combination. You only need to release the lock the first or third time the first or third number surpasses the second. So we would attempt 27-1-27, then rotate CW to 5 and CCW to 27, then CW to 9 and CCW to 27, then CW to 13 and CCW to 27, then CW to 17 and CCW to 27, then CW to 21 and CCW to 27, then 27-33-27, then CW to 37 and CCW to 27. Because the disk for the second digit is unaffected as we rotate CCW, we are essentially merely increasing the value of the second number. When the value grows too large, we essentially passed the first number twice and then chose our second digit, which is why we have to reset when the second number exceeds the first.

When You Know Your Master Lock’s Serial Number

1. Download a “Lost Combination Form” from Master Lock. This may be found at: combo form.pdf. Wait until you meet with a notary public before filling out your paperwork.

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2. Take your form to a notary public and get it notarized.

3. You may generally locate a notary at your local bank.

  • Fill out the form in the presence of the notary public. Have the necessary identification to validate your identity.
  • Pay the notary charge. Master Lock will not compensate you for the payments.

4. Make a copy of your lock’s serial number on a piece of paper. The photocopy should indicate that your lock is not linked to anything. Then, behind the lock image, manually write the serial number.

5. Mail your notarized form and photocopy to: Master Lock Warehouse 1600 W. La Quinta Rd. Suite/WHSE #1 Nogales, AZ 85621

6. Wait 4 to 6 weeks. Master Lock will process your request and provide you your new combination.

How do you open a Master combination lock without the code?

To open a combination lock without a code, pull up on the dial and spin it clockwise until the lock clicks. Then, verify your current number, add 5 to it, and write it down. Set the dial to that number then counterclockwise spin it until you hear it click again.

How do you pick a master brand lock?

Raking a Master Lock is the simplest technique to open it. This is accomplished by first tensioning the core and then bumping all of the pins to the shear line with a lock pick. Master Locks may also be picked using improvised tools such as paperclips, bobby pins, soda cans, and even chicken bones.

How do you jam a door lock?

Place the chair’s top squarely beneath the doorknob.
To secure the door, use a door jam bar.
Install a door stop behind the closed door closest to the doorknob. …
Close the door and pound the nails into the door frame at a diagonal angle along the edge of the door with your hammer.

Can you break a lock with a hammer?

It turns out that any Master Lock can be simply broken into with a simple hammer. As seen in this video, all you need to do to unlock a Master Lock is tap the side with a hammer, no key or combination necessary.

Can you break a lock with a screwdriver?

A conventional padlock, for example, may be broken with nothing more than a hammer, a screwdriver, or a pair of open-ended wrenches.

How do you open a Master Lock with a knife?

Insert your knife between the gap of the door and the doorframe at the precise height of the doorknob. Examine the door until you feel a lump of metal protruding from it—this is the latch, and it should feel springy! Using your knife, press the latch into the door.

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