How to Open Master Locks

PDF download Download Article
Tons of ways to successfully break into any Master Lock
PDF download Download Article

Sometimes, you have a master lock, and no combination. Here are several methods you can try to open a Master Lock. It is important, to know if you have a light duty, heavy duty or special duty lock. The methods of forcing open locks are obviously easier on the lighter locks. Of course, you can always pay a locksmith to open a lock, but that isn't the wikiHow way!

Method 1
Method 1 of 6:

Bumping Open the Lock

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    Know that Bumping a Lock is the best method.
  2. Watermark wikiHow to Open Master Locks
    Procure or make a bump key . Procuring a bump key involves asking for a locksmith to make a 999 key (where all the valleys are cut to the maximum depth.) [1]
    • Asking for a 999 key may cast you under suspicion, so be careful.
    • Get your triangular file to go with it.
    Advertisement
  3. Watermark wikiHow to Open Master Locks
    Follow the directions on the wikiHow how article on bumping a lock.
  4. Watermark wikiHow to Open Master Locks
    It is unlikely that you have one.
    5. Advertisement
Method 2
Method 2 of 6:

Breaking it Open

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    They will only work if you have a cheaper lock, or a very respectable tool set.
  2. Watermark wikiHow to Open Master Locks
    Sometimes, a good jolt will knock the lock free. This won't work on all locks, but you may have some fun. [2]
    • If the lock is on a wooden door, the odds are you will break the door before the lock.
  3. Watermark wikiHow to Open Master Locks
    A drill should go right through the center of the lock where the mechanism is. This won't work on most master locks, and will likely disable the lock so it cannot even be opened with the proper key.
  4. Watermark wikiHow to Open Master Locks
    The right power saw cuts through the lock itself.
    • The New York city fire department uses saws with an aluminum oxide blade. It is effective when you can access the lock with it.
    • Wear eye protection and cut through the body of the lock (not the shackle.) [3]
  5. Watermark wikiHow to Open Master Locks
    You can use this tool on the shackle or on an attached cable.
    • If the lock is attached to a cable, you may have better luck cutting the cable than the lock.
    • If you want to try to cut open the lock itself, cut the shackle. This will not work on most master locks, as they are made of case hardened steel.
  6. Watermark wikiHow to Open Master Locks
    This only works if there is enough space to fit the pliers in. Similarly, for huge padlocks, a car jack may work to separate the lock.
    • Naturally, these methods only work if there is enough space.
  7. Watermark wikiHow to Open Master Locks
    You can actually open the lock with a high powered rifle, but you may be sprayed with metal fragments or ricocheting pieces.
    • This was proven by the Mythbusters.
    • The Mythbusters tried a 9mm, a 357 magnum, a shotgun, and a M1 Garand rifle. The handguns did not work at all. The shotgun loosened it up
    • It is not safe to do this. Ricochets could kill you or someone else. The high-powered rifle created shrapnel. Don't try it.
    8. Advertisement
Method 3
Method 3 of 6:

Buy or Make a Shim

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    They are available at lock stores or online.
    • A shim is a small and thin piece of metal that can slide between the gaps of a lock.
  2. Watermark wikiHow to Open Master Locks
    You can also try making a shim with an aluminum can; this will be free. Slide the shim into the locking side of your Master lock and move the shim back and forth. Sometimes, your lock will pop open!
    • You need to be pretty mechanical to try this, but if you do it you will have your lock intact.
    • It may not work if you have a high-quality lock with strong springs, so better for a cheaper lock.
    • 70% of wikihowians who tried making a shim told us it worked.
    3. Advertisement
Method 4
Method 4 of 6:

Try to "Crack" the combination

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    Crack the combination using some experiments and math.
    • You need manual dexterity to feel the sticking point of the locks.
    • 55% of wikihowians who tried this reported it worked.
Method 5
Method 5 of 6:

Picking the Lock

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    If your lock has a key, you can try picking it. Picking a lock takes practice, and is not recommended if you are in a hurry (like, if you have been locked out.)
    • You also need the correct tools. You want a torsion wrench and pick.
    • The best tools to improvise from would be a filed down allen wrench or very thin flat head screwdriver.
    2. Advertisement
Method 6
Method 6 of 6:

Getting the Combination from Master Lock

PDF download Download Article
  1. Watermark wikiHow to Open Master Locks
    This can be found here on the masterlock website here. Wait to fill out your form until you meet with a notary public.
  2. Watermark wikiHow to Open Master Locks
    You can usually find a notary at your local bank.
    • Fill out the form in the presence of the notary public. Have the appropriate ID that you'll need to confirm your identity.
    • Pay the notary's fee. Master Lock won't reimburse you for the charges.
  3. Watermark wikiHow to Open Master Locks
    The photocopy should show that your lock isn't attached to anything. Then, hand write the serial number beneath the picture of the lock.
  4. Watermark wikiHow to Open Master Locks
    • Master Lock Warehouse
    • 1600 W. La Quinta Rd.
    • Suite/WHSE #1
    • Nogales, AZ 85621
    5. Advertisement

Community Q&A

Search
Add New Question
  • Question
    How do I open a lock with a combination at the bottom?
    Upnorth Here
    Top Answerer
    Dial in the numbers required in the proper combination and pull open the shackle. If you do not know the combination, you will need to break the lock, try to "shim" it (as described in the article), or patiently try to determine the combination by trial-and-error. Because most such locks can be configured by the buyer, the company will have no idea what your combination might be.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 5 Helpful 2
  • Question
    I have a lock I haven't used in years and don't remember the combination. What should I do?
    UniStar123
    Community Answer
    If it's a Masterlock with a combination code like in the article, you can try to switch things around and see which combination works. That sometimes works. However, if it's one of the three-digit-number ones, trying to cut it open might take less time than cracking it, unless you want to try as many as 99,999 times.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 0 Helpful 0
Ask a Question
200 characters left
Include your email address to get a message when this question is answered.
Submit
      Advertisement

      Video

      Tips

      Submit a Tip
      All tip submissions are carefully reviewed before being published
      Name
      Please provide your name and last initial
      Submit
      Thanks for submitting a tip for review!

      Warnings

      Advertisement

      You Might Also Like

      How to
      Reset a Luggage Lock
      How to
      Unlock a Door
      How to
      Open a Door with a Credit Card
      How to
      Reprogram a Sentry Safe with or without the Factory Code
      How to
      Open Combination Locks Without a Code
      How to
      Unlock a Safe: Combination Locks, Digital Locks & More
      How to
      Break a Lock
      The Best Ways to Get a Broken Key Out of a Lock
      A Detailed Guide to Programming Car Keys & Fobs
      How to
      Pick Locks On Doorknobs: Knob Types & Lockpicking Tutorials
      Don’t Panic! What to Do When You’ve Locked Your Keys inside Your Car
      How to
      Open a Locked Bathroom Door (Twist & Push Locks)
      How to
      Replace the Batteries in a Mercedes Key Fob
      How to
      Open a Lock
      Advertisement

      References

      1. ↑ https://www.businessinsider.com/how-to-create-a-bump-key-to-open-any-door-2011-10
      2. ↑ https://gizmodo.com/how-to-break-open-a-master-lock-with-just-a-small-hamme-1745289745
      3. ↑ https://web.archive.org/web/20180720202945/http://www.aces.uiuc.edu/vista/html_pubs/saw/saw.html

      About This Article

      Article Summary X

      To open a Master lock without the combination, try hitting it with a large hammer to try to jolt the lock free. You can also use bolt cutters to cut the shackle on top of the lock. If you can’t break the lock, download the “Lost Combination Form” from the Master Lock website. Next, sign and notarize the form and make a copy of the serial number on the lock. Then, mail the form and serial number copy to the Master Lock Warehouse so they can give you the combination. For tips on how to open a Master lock using a bump key or a shim, read on!

      Did this summary help you?
      In other languages
      Thanks to all authors for creating a page that has been read 469,429 times.

      Did this article help you?

      Advertisement