How to Open a Master Lock if You Dont Know the Combination

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If you don't know the combination to a Chief Lock^[1] combination lock, you have a few options. If your lock is attached to something, you can break the lock, telephone call a locksmith or use a shim. However, these options could put a dent in your wallet. Sometimes, your cheapest choice is to figure out the combination.

Steps

1. 1

   Note that a standard 40-digit Master Lock has 64,000 possible combinations that may open up the lock. ^[two] However, don't permit that discourage you. If y'all don't know the series number, then you tin can significantly narrow downwards the number of possible combinations to fissure your lock (Method ane). If you know the serial number, y'all can request the combination straight from Master Lock (Method 2).

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1. i

   Turn the dial at least iii rotations clockwise first, just to make sure it is clear. Turn the lock's punch clockwise to zero.

2. 2

   Employ pressure on the shackle, which is the curved handle at the tiptop of the padlock. Turn the dial clockwise (CW) slowly as you press the shackle. If you can't plough the dial at all from the zero signal, release the shackle and turn the dial CW but a number or 2 and then try it over again.

3. 3

   Find the first sticking point.

   • Equally you turn the dial CW with tension on the shackle, you will come to the commencement clockwise stopping signal where you can't plow the dial anymore. Make note of where it stops. Sometimes, the dial volition stick right on the numbers, just sometimes the sticking point will be between the numbers. If and then, record the number to the one-half (example: 22.five).^[three]
   • While standing to apply tension to the shackle, turn the dial every bit far left (counter-clockwise) as you can. Brand notation of the first counter-clockwise (CCW) stopping betoken. The CCW stopping point and CW stopping point course your sticking "range", for example, 22.5 to x. (Note: Some 800XXX and 908xxx locks take a two number sticking range [for example, 28 to 30 and 10 to 12].)^[four]
   • Make up one's mind the first sticking betoken past finding the number that's in the midpoint of the sticking range. A range of 4 and 5 would take a commencement sticking point of four.5. A range of 22.5 and 23.5 would have a outset sticking bespeak of 23.
   • Each set of numbers that you find volition have the aforementioned range. For example, one group may be 0.25 to 0.75 and some other may exist 0.5 to 0.25 on either side of the sticking points.

4. four

   Release the shackle tension and turn the dial clockwise slightly past the showtime sticking point. Turn the punch clockwise about one number higher from the first sticking point in club to permit y'all to "escape" that sticking point.

5. 5

   Reapply tension to the shackle and continue turning the punch clockwise to detect the remainder of the sticking points. You should find xi more sticking points, for a total of 12 sticking points in i complete turn of the dial. Write all 12 sticking points down.

6. six

   Find the third number of the combination.

   • Look at your list of sticking points and eliminate all those which are not whole numbers (that is, cantankerous off any number that ends in 0.5). You should eliminate 7 of the 12 numbers with this step.
   • Of the remaining sticking points, choose the number with the unique digit in the "1s" position. 4 of the remaining v numbers will share the aforementioned number in the "1s" place, so for case, if the numbers left on the list are 4, fourteen, 24, 27, and 34, the number 27 is the only number which does not have a iv in the "ones" place. This is the third number of the combination.
   • If yous just accept iv numbers remaining and they all share the same digit in the "1s" position, check the "note" above in stride 3 about a 2-number range... the third number of your combination will be the number that has a 2-number range (for example, if yous have 0, 30, xx, ten left, merely 20 has a range of 19 to 21, that would mean that your 3rd combination number is xx).

7. vii

   Find the magic number. Split the third number of the combination (27 in this example) by iv, and write down the rest.

   • In this case 27/4 = 6 balance 3. Remember that yous are only concerned with the balance, which will always be 0, 1, two, or 3. If the third number of the combination is less than iv, that is your magic number.
   • The residual is the magic number. Write it downward.

8. viii

   Find the possible offset numbers of the combination.

   • Add 4 to the magic number (3). Write down the result (7).
   • Now add iv to that and continue adding 4 to each resulting sum until you lot have gone completely around the punch once. Write down each of these numbers.
   • For the example above, the numbers would exist 3, seven, 11, xv, 19, 23, 27, 31, 35, and 39. One of these numbers is the starting time number of the combination. (Notation: For some 800XXX locks, this will exist the 2d number of the combination. The next fix of numbers will exist used as the beginning)

9. 9

   Find the possible 2d numbers of the combination. If your magic number is 0 or 1, then add 2 to it. Otherwise, subtract ii from the magic number.

   • Since the example magic number is 3, decrease two and get i.
   • Write downward the answer and add 4 to information technology. Now add together 4 to each resulting sum until you accept gone completely around the dial in one case.
   • In the example, the numbers would be ane, 5, 9, thirteen, 17, 21, 25, 29, 33, and 37. One of these numbers is the 2d number in the combination.

10. 10

    Cross out the numbers plus or minus ii from the third number of the combination. In this case, since 27 is the third number, you tin cross 25 and 29 off your list of possible second numbers.

11. 11

    Figure out the correct combination by trial and mistake. Y'all at present know all the possible first numbers (3, 7, eleven, fifteen, 19, 23, 27, 31, 35, 39), all the possible 2d numbers (1, five, ix, 13, 17, 21, 33, 37), and the 3rd number (27). You've just narrowed downwardly 64,000 combinations to only 80. Try every possible combination until you find the right one.

12. 12

    For many Master Locks, you can apply the following to help figure out the first number... Apply pressure on the shackle, Plough the dial counter-clockwise (CCW) slowly as yous pull the shackle. Once per rotation it should stick. Look at the number when it sticks and add 5 to that value. Find the number you wrote downwards for the first digit (in stride 9) that is nearest the sum. For example if the lock sticks at 17 when rotating CCW, you would write down 17+v=22, so look in the listing above and determine that 23 is probable the outset number of the combination. [It might not work for 800XXX locks, just information technology's withal a good starting number to effort.]

13. 13

    Speed tip: Y'all don't have to clear the lock to attempt each combination. Yous only have to clear the lock when the outset or tertiary number exceeds the second for the first fourth dimension. So nosotros would try 27-1-27, then rotate CW to v and CCW to 27, then CW to 9 and CCW to 27, and so CW to 13 and CCW to 27, then CW to 17 and CCW to 27, then CW to 21 and CCW to 27, *now that the next number we would try is 33 which is greater than our kickoff digit we would endeavour 27-33-27, then CW to 37 and CCW to 27. The reason this works is the deejay for the second digit isn't impacted when we rotate CCW, so we are finer only setting the 2d number to a bigger value. When the value gets too large and then nosotros effectively passed the kickoff number *twice* and so picked our 2nd digit -- which is why we have to reset when the second number becomes bigger than the outset.

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1. 1

2. 2

   Accept your form to a notary public and ask to accept the form notarized. ^[v] You can usually find a notary at your local bank.

   • Fill up out the course in the presence of the notary public. Accept the appropriate ID that you'll need to ostend your identity.
   • Pay the notary'due south fee. Master Lock won't reimburse you for the charges.

3. 3

   Photocopy your lock's serial number onto a slice of newspaper. The photocopy should evidence that your lock isn't attached to anything. Then, manus write the serial number beneath the picture show of the lock.

4. 4

   Post your notarized form and photocopy to:

   • Principal Lock Warehouse
   • 1600 W. La Quinta Rd.
   • Suite/WHSE #1
   • Nogales, AZ 85621

5. 5

   Wait 4 to 6 weeks. Primary Lock will procedure your request and ship you your new combination.^[6]

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Add together New Question

• Question

  Can you reset Master Lock combination?

  

  This respond was written by one of our trained team of researchers who validated information technology for accurateness and comprehensiveness.

  

  wikiHow Staff Editor

  Staff Respond

  This depends on whether or not the Master Lock in question is a "resettable" lock. It also depends on whether it is in the open or airtight position earlier you endeavor to reset it (ordinarily it volition need to exist in the open position). Information technology'south best to cheque the manufacturer's instructions or website to run into what's possible and you tin can likewise cheque out the wikiHow How to Reset a Master Lock.

• Question

  How do you open a chief lock combination?

  

  This answer was written by 1 of our trained squad of researchers who validated it for accuracy and comprehensiveness.

  

  wikiHow Staff Editor

  Staff Answer

  If you know the code, place the lock so the combination dial faces yous. And so, turn the combination to the correct 3 times but on the third time, stop at your first digit of the code. Then, turn the dial left one complete turn, passing the first digit and stopping at the 2nd digit of your lawmaking. Finally, turn the dial right, and stop at your code's third digit. Pull down on the lock to release its shackle, then the lock will open. You'll find more aid in the wikiHow How to Open Principal Locks. Or, the instructions in the steps above will walk you through attempting to open up a master lock combination if yous've forgotten your lawmaking.

• Question

  How do you reset a combination padlock?

  

  This reply was written by ane of our trained team of researchers who validated it for accuracy and comprehensiveness.

  

  wikiHow Staff Editor

  Staff Answer

  For aid with resetting a combination padlock, run across the manufacturer'southward instructions showtime, to exist certain y'all're using the right technique for your padlock. And you lot tin can also check out the wikiHow How to Reset a Primary Lock.

• Question

  Tin you pick a combination lock?

  

  This reply was written past i of our trained team of researchers who validated it for accuracy and comprehensiveness.

  

  wikiHow Staff Editor

  Staff Answer

  Information technology's possible only yous'll need to try a few different ways and there are no guarantees, particularly not if you take to destroy the lock in the process! For assistance with attempting to choice a combination lock, check out the wikiHow How to Open a Combination Lock without a Lawmaking.

• Question

  Would the combination lock then be considered to be unsafe, since thieves can crack any chief lock?

  

  Any lock is unsafe because every lock can be cracked. Some locks, however, are fashion harder to be croaky then others.

• Question

  How practice I crack a lock that doesn't have sticking points?

  

  If you mean a lock that takes a primal, then at that place is another folio for that hither, but if yous're talking well-nigh a combination lock then it has sticking points, y'all're simply non doing it right. Keep trying!

• Question

  How exercise I modify the combination on a twoscore digit Master Lock?

  

  Yous don't. The combination for each xl digit Master Lock is congenital in by the company.

• Question

  I have a Keep Safe wall safe with a combination lock and the door has been stuck for years. How tin can I go it open up, even if the door becomes damaged?

  

  A crowbar, bolt cutters, and some proficient old fashioned ingenuity, or if you don't care about what is inside, then just accident the thing to bits.

• Question

  I know my code, but it doesn't piece of work, and I don't have plenty time to mail service it. What should I practise?

  

  Check that you lot are inbound the code correctly. The instructions for a 'Chief Lock' are: 1.)Turn correct three times. Cease at First Digit. 2.)Turn left one full plough, passing first number, and stop at 2nd Digit. three.)Turn right and stop at 3rd Digit. Pull shackle. If this is still not working, try using the method to run across if the combination is right.

• Question

  How can I fill out the course if my Master Lock has a serial number, but I live internationally?

  

  You fill it out by going to the Master Lock website.

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• The "sticking" method does not work on Master Lock Sphero Locks.

• Only consider proceeding with Method 1 if you bask a claiming, or if your lock is extremely valuable. Otherwise, cutting off the lock and buying a new lock makes more sense.

• Call the company for help. Or visit the website.

• If your lock has a key way on the back, you can drill a small hole next to it then that you can view the tumblers. After you align the tumblers, and determine the unlock code, you tin seal the hole with a 2-part epoxy.

• If your lock is already open up, merely you don't know the philharmonic, you lot tin can figure it out by pushing that lever out of the way and wait into the within with a flashlight. You can now see all three rings. Exercise the normal process of setting the philharmonic to align all iii notches in the visible area. Record the numbers every bit you do this. In order to open a closed lock, you'll have to add together/subtract a number on the order of 6 or so to all iii numbers you lot recorded to yield the actual combo. It's obvious what you take to do when you go all the notches aligned in the visible area.

• Sometimes the sticking points for finding the 3rd number are not exactly on acme of a number or between 2 numbers. In this case:

  • one. Plow CW to the get-go of the 12 sticking points from 0.
  • ii. Continue to turn CW to the contrary side of the dial.
  • 3. Plough CCW dorsum to the kickoff sticking point from 0.
  • four. Pull upwards on the lock and plow the dial left and correct in the small sticking area and write down the exact range (for example, ii.75 to 3.five).
  • 5. Repeat this iv more times for the numbers 10 more than from each other (for case, iii, xiii, 23, 33).
  • vi. At present echo steps i to 5 for the second sticking point by 0.
  • 7. Do the steps over again for the third signal past 0.

Thanks for submitting a tip for review!

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• This procedure works with some Principal Lock combination locks but may not work with all of them, particularly if the lock has no serial number. Some locks may not plow at all when the shackle is raised. According to rumors, Primary Lock changed the combination algorithm on some of their locks, in particular those with serial numbers starting with the number 800.

• Do not apply this technique to crack someone else'south lock without permission from them.

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Things You lot'll Need

• Main Lock "lost combination" form
• Notary public stamp
• Photocopy of serial number
• Envelope and stamp
• Primary Lock combination lock
• Newspaper and pencil to record numbers

About This Article

Article Summary 10

To scissure a Master Lock combination lock, download a lost combination class on the Chief Lock website. Then, fill out the form and pay to have it notarized. Once you've completed the class, mail it to the Master Lock warehouse forth with a photograph of the lock and the lock'south serial number. After about four-6 weeks, y'all should receive the combination to the lock in the mail. To learn how to crack a Master Lock without the serial number, keep reading!

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