How to crack a masterlock padlock.
6 Steps
This little instructable will demonstrate how to narrow down the possible combinations for your lock from over 60,000 to 80. This is good for if you lose "your" combination.
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## Step 1: Knowing thy lock.

First of all, there is a dial, a body, and a clasp (The U shaped thing on the top that comes out when unlocked).

When you open your lock you would normally spin the dial right a few times to reset, then go to your first number. Then, you would turn left, passing your first number once, then stopping on your second number. Finally, you would turn right again to your third, and final number and pull on clasp.

Okay, now you know thy lock.
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ide león says: Dec 20, 2012. 4:21 PM
Didn't work for me... I've got 32 as the last number 1st number = 0,4,8,12,16,20,24,28,32,36 2nd number = 2,6,10,14,18,22,26,30,34,38 I go CW 3 times, then I stop in 1st number, then I go CCW passing 1 time infront of 1st number before I hit 2nd number, then I go directly to 32 (3rd number) = nothing I did it 3 times already... I'm sure about the numbers, I think is the way I'm spinning the dial. I need some insight???
ababypenguin says: Sep 11, 2012. 12:16 AM
37-11-25 Thanks friend ;)
hulldesign says: Aug 30, 2012. 8:34 PM
This worked on a lock I bought in the late 80's. Remembered the correct sequence before I turned the dial on the last combination. Sometimes just setting up the sequences will trigger the memory - if it's a lock you opened a few times. Many years ago. Thanks for the Instructable!
egle14 says: Jul 26, 2012. 9:04 AM
what if my third number is a one. what is my remainder?
jrunyan1 says: Nov 25, 2011. 7:51 PM
Easier way, just cut an "M" out of a pop can, fold in the two sides so it lookes sorta like a t, wrap it around the Pole , push down, squeeze, and pull
evindrews says: Sep 17, 2011. 8:29 AM
So I can't use 12 and 8? Because the last number of my combination IS 12. also, if you get stuck on 3.5, do I move the lock wheel to 4, or 5?
And how Exact DO I need to be doing the numbers?
adavis34 says: Nov 22, 2011. 7:33 PM
no its you need to FIND 12 #'s not 8 #'s
riff raff says: Nov 18, 2011. 5:46 PM
Ha! It worked! Had an old Master lock in the junk drawer; no one could remember the combination. Got it on the 18th try. Thanks!
rshaw94 says: Oct 10, 2011. 10:56 PM
i went through all your steps using a lock with the key slot on the back, and did all the combinations but no luck /: thanks though.
noremakk says: Jul 19, 2010. 10:17 AM
"Now remove any 2nd numbers +/- 2 from your third." What does this mean? Do I remove the numbers from the second list that are within two numbers of the third?
QuestionConvenience says: Aug 17, 2011. 12:37 PM
Yes, I think that you remove any numbers from the list of 2nd numbers that are within 2 of your 3rd number. For example, if your 3rd number is "38", you would remove 36, 37, 38, 39, and 40 from your list of 2nd numbers (if they are on that list). I'm still trying out this technique, but that's what I think Step 5 meant.

Peace
QuestionConvenience says: Aug 17, 2011. 1:32 PM
Yep! Just worked for me. Doublecheck your numbers, and be patient! Keep track of the numbers you tried. Nice instructable!
platinum15 says: Oct 28, 2010. 6:01 PM
i think if its a negative number, you add -2, and if its a positive number, add +2. see if it works and sorry if im wrong :P
jdollar says: May 5, 2010. 11:22 AM
I think I found a way to narrow the possible "try" combinations down to only TEN.

I think that I found a way to discover what the FIRST number in the three-number combination is. So if you have the first and the last number you only have to try ten combination AT MOST, to find out what the correct one is.

http://4urnfo.com/lockpicking/first-number-of-combination.htm

jdollar
bombtech91 says: Nov 29, 2007. 7:47 AM
anoher way to narrow combos is to remember... First number is always LARGEST.. se4cond number is usually smallest.. and you have she last... don't feel like doin the math, but that removes quite a few possibilites
jdollar says: May 5, 2010. 11:15 AM
The first number is NOT always the largest.
I have one that is 18-24-34  master lock is purple in color.

jdollar
DaPaulness332 says: Nov 11, 2008. 10:36 PM
yea, mine's 9-12-19 for school
chaosrob says: Sep 11, 2008. 9:37 AM
Maybe for all the locks that you've seen. I have one that is 0-20-26. Hmmm, unless you think the "0" is considered the highest number (on combo locks)
MoeMonkey says: Jun 23, 2009. 9:41 AM
my lock goes up to 39 like I think most Master Locks so I guess 0 is like the Ace in Cards, it has too numbers, 0 can be 40
Sypran says: Apr 29, 2008. 2:17 PM
not true my old locker combo before i switched lockers was 17 47 43...
bowmaster says: Jan 25, 2008. 2:18 PM
My school lock combo is 1-27-1 I just broke your theory and last year my combo was 13-19-13
howboutitbru says: Dec 8, 2007. 10:46 PM
no always man my pe one starts with like something aroudn 9 nad my third number is 35... 35>1st number
howdoesthiswork says: Mar 24, 2010. 12:01 PM
There's an app for that! Crack a combination lock by ear with the iPhone app called "Padlock!" Pretty fun!
left4dead4432 says: Mar 20, 2010. 4:02 AM
i have done that before i just opened the backside of it and opened all the way through and it just fell apart.
Peekadosies says: Jan 14, 2010. 2:51 PM
You put Step 5 in step 4
=P
pete54321 says: Dec 28, 2009. 11:05 PM
with step three, you chose 19 out of 12 possible numbers, how do we know which number to choose?
also i read on another site that you should cross out all the numbers which arent whole numbers, should we do the same?
thanks
RobotWoods says: Oct 24, 2009. 6:53 PM
There's also the new iPhone App 'LockGenie' which helps crack the combinations and does all of the combination prep for you. http://itunes.com/apps/lockgenie
tomtortoise says: Oct 12, 2009. 2:51 PM
sorry switch 1st and 3rd
tomtortoise says: Oct 12, 2009. 2:50 PM
i got to this step and my numbers are 1st 21
2nd 3,7,11,15,19,23,27,31,35,39
3rd 1,5,9,13,17,21,25,29,33,37
and if i remove any numbers +/- 2 from the third i lose all of the numbers
r3nrut says: Sep 28, 2009. 4:00 PM
can zero be a number?
wiilikepi says: Oct 4, 2009. 1:14 PM
yes =D
memyselfand1 says: Sep 12, 2009. 5:28 AM
We have these on almost every one of our school lockers. Some things we do are: 1. kick them. They won't open if you do it enough 2. watch people entering their codes, then put their lock on backwards 3. switch peoples locks around so there is a whole myriad of possibilities with these locks.
aj301292 says: Aug 12, 2009. 2:38 AM
this could work. i just tryed it on my locker code for school, which is one of the ones with a key lock in the back, for teacher inspections. this theory workes because with these locks close enough is good enough
Ideal_Ideas91 says: Jun 27, 2009. 11:02 PM
This Dont Work! I have tried this on master locks and they lock on every digit! I dont know if they changed the design but I do know the thing wont lock up on on 2 different numbers
BEAST14 says: Sep 14, 2008. 6:58 PM
That would take a long time and a lot of thinking,...is there an easier way?
musicninja17 says: Mar 4, 2009. 7:11 PM
Once you get the hang of it, you should be able to do this in under 20 mins...ther whole point of this trick is that you can still use your lock again...
CapinPorcupine says: Oct 4, 2008. 10:04 PM
Yea. take a thin falt head and jam it into the edges of the dial until there all up the pry the dial off and rip up the insides of the lock
assasin says: Jun 6, 2007. 5:31 PM
Master lock only?
musicninja17 says: Mar 4, 2009. 7:10 PM
Not necessarily... others do work...
Dandy in the Ghetto says: Jul 7, 2008. 5:28 PM
When I was in PE in highschool, we used to smash the padlock on on the top of the side that the clasp opens up on. I would do this with another lock. It opens right up after a few solid whacks. You can close it again after too, at least for the first 15 or 20 times you do it. You really have to beat the hell out of it though
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