How to reset lock on master lock

Question

To reset a Master Lock with a precision dial, open the lock and turn the shackle to access the shackle hole. Next, insert the reset tool and rotate the dial clockwise 3 times to clear the old combination. To enter a new combination, turn the dial right and stop on the first character, then do one full rotation left, passing over the first character and stopping on the second character, before turning it to the right to stop on the third character. Finally, remove the reset tool and return the shackle to its original position! For tips on resetting other types of Master Locks, read on!

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Top Videos for Reset & Retrieve Lost Combinations
Lost Combinations
Resetting the Combination on your Key Safe, Mini Safe, & Portable Safes
How do you reset a Master Lock if you forgot the combination?

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March 31, 2020 Kelly Gowing

To reset your combination, you will need to know your current combination.

175 & 176

643D

653

Here are the instructions for changing the combination on you model 653D lock. This lock is preset at the factory to operate at 0-0-0-0.

With dials at 0-0-0-0, pull out the shackle
Turn shackle counterclockwise 90 degree (1/4 turn)
Continue pressing shackle down and turn another 90 degree (1/4 turn)
Set the dials to your own combination
Turn shackle clockwise back to the original 90 degree position, lift and return shackle to closed position
Be sure to record your NEW combination as you are the only one that knows it!

875, 975

1175, 1177, 1178

1500iD

1535D, 1535DWD

1590D

If you’ve lost your combination and your lock has a serial number, we may be able to help. We can also help you find instructions to reset the combination on your Set-Your-Own Combination Locks.

Lost Combinations

I've lost or forgotten the combination to my Master Lock lock. What can I do?

Does your Master Locklock have a serial number? If it doesn't, we won't be able to help you find your combination because we don't have a record of it. Learn how to find your lock's serial number.

If your lock has a serial number, you can recover your combination in one of three ways. You can visit a Master Lock Distributor / Retailer or submit a Lost Combination form.

Distributor / Retailer

Bring your lock to the retailer. Be sure that it is not attached to anything. If you do not bring the lock, or it is attached to something, we will not release the combination.
Ask them to contact us on your behalf. US distributors can call 1-800-308-9244. Canadian distributors can call 1-800-227-9599.
Please note that although Master Lock does not charge for this service, the retailer may charge a fee.

Submit a Lost Combination Form

Find your lock's serial number.
Print out the Lost Combination Form (PDF).
Have the form notarized by a Notary Public to prove you are the owner of the lock. You can include up to 6 combinations on one notarized form.
Submit your form to:
Master Lock Warehouse
24 North Free Port Drive
Nogales, AZ 85621

Once we receive your request, you will receive your combination in approximately 4-6 weeks.

Send a Photo Via Contact Form

Send a picture of the lock clearly showing it is not attached to anything The image should clearly show the entire lock and the serial number. The lock cannot be attached to anything. Any photo with digital edits will be rejected.
Use the "Contact Us" form to send us the photo. Fill out the form and be sure to select "Lost Combination" option.

We will respond in 7-10 days.

Note: If you are an inmate in a correctional facility, you must submit your request on official prison facility letterhead. In lieu of notarization, the Lost Combination Form must be signed by a prison facility official.

I lost the combination to my Master Lock Set-Your-Own Combination lock. Can you help me reset it?

Unfortunately no. You cannot reset this lock without knowing the current combination. You'll likely need to purchase a new lock.

I accidentally reset the combination on my Master Lock resettable combination lock. Now I don't know the correct combination. Can I reset the lock back and assign a new combination?

Unfortunately, you cannot reset this lock without knowing the current combination. You'll likely need to purchase a new lock.

I've lost the Master Lock reset tool for changing the combination on my lock. How can I get a new one?

As a courtesy, Master Lock customer solutions group can issue you a replacement tool free of charge. You will need to supply the model number or an image of your lock. Please contact us to submit your request.

How can I retrieve my lost combination when my Master Lock lock is attached to a bike, cabinet, locker, or something else?

We will not provide lost combinations if the lock is attached to anything.

I'm unable to get a legible photocopy of my lock for the Lost Combination Form. What should I do?

Try lightening the copy as much as possible. The most important thing is that we can see that the lock is not attached to something.

Resetting the Combination on your Key Safe, Mini Safe, & Portable Safes

How do I set the combination on my Master Lock 5400D / 5401D Key Safe?

To set or reset the combination on your Master Lock 5400D / 5401D Key Safe:

Open the compartment door by entering the combination. The factory-set combination is 0-0-0-0.
Push the reset lever left and down. The lever will remain in this position while you reset the combination.
Rotate the dials to your desired combination.
Push the reset lever back into its original position - back and to the right.
Close the compartment door and scramble the dials to lock. This Key Safe has a new combination. Don't forget to store your new combination in a safe place.

For further guidance on how to set or reset the combination on your lock, please watch our instructional video.

How do you reset a Master Lock if you forgot the combination?

You can visit a Master Lock Distributor / Retailer or submit a Lost Combination form. Bring your lock to the retailer. Be sure that it is not attached to anything. If you do not bring the lock, or it is attached to something, we will not release the combination.

reset lock master lock