Question about Master Lock 1590D Set-Your-Own Combination Lock, Steel, 1 7/8"Wide, Assorted

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I have the serial number for my master lock but I lost the combination

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Michael Obinna Nwogwugwu

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Sorry, I don't think there is a remedy, but you could try removing it, and reinstall again.

Posted on Apr 21, 2011

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1 Answer

What's my combination


Each padlock has a different combination. If you lost yours, that's reall bad luck. Take it to a good locksmith, maybe he can find out. If pretends to charge you too much, get a new padlock

Apr 12, 2015 | Master Lock 175D Combination Padlock...

1 Answer

A serial number lookup


No, no, no, no. That won't work. Otherwise, anyone could get the serial number, get your combination, and open your lock.

Aug 02, 2014 | Master Lock Locks & Locksmithing

1 Answer

My master lock is locked and i don't know the combination to it


If this is an older masterlock with a serial number, you can fill out the form located here http://www.masterlock.com/pdfs/lost_combo_form.pdf
Read the below from masterlocks website: Due to increased security concerns nationwide, Master Lock recognizes the heightened need for additional safety measures. We no longer provide lock combinations in response to phone, fax, or email requests. Please follow the procedure outlined below to obtain the combination to your lock and submit your request to:
Master Lock Warehouse
1600 W. La Quinta Rd
Suite/WHSE # 1
Nogales, AZ 85621Procedure:
  • Print out the Lost Combination Form from a printer friendly page, or download the PDF file.
  • Have your Lost Combination Form notarized by a Notary Public to prove that you are the owner of the lock (you can include up to 6 combinations on one notarized form).
    • Note: Inmates at a correctional facility - in addition to the lost combination form, you must submit your request on official prison letterhead. In lieu of notarization, the form must be signed by a prison official.
  • Photocopy the serial number on the back case of your combination lock. This copy MUST clearly show that the lock is not attached to anything. Be sure to hand write the serial number on the photocopy.
  • Mail the original completed, notarized Lost Combination Form and the photocopy of the back of your lock to the address above.
Note: It will take approximately 4 to 6 weeks to process your request for a combination.

Note: If the form is not fully completed and notarized with a raised seal or rubber stamped seal, or if the serial number is not legible on the photocopy, your request will not be honored. Master Lock does not reimburse for any Notary fees.

Aug 27, 2011 | Garden

1 Answer

How do you open a master lock model 5400d if you forgot the combination


It would appear that you made a mistake in setting your new combination on your Master Lock 5400d and did not register the combination at Masterlockvault.com. The only way to open your lock is by using the correct combination. There is no other way. Most mistakes are normally one or two digits out, so you may wish to try variations on what you thought you set.

Apart from that you can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

Jul 14, 2011 | Master Lock 5400d: Portable Select Access...

1 Answer

I have a master lock its a lockbox model 5400d i forgot the combination and my car keys are in it


You have forgotten the combination on your Master Lock 5400d and did it appears that you did not register the combination at Masterlockvault.com. The only way to open your lock is by using the correct combination. There is no other way. Most mistakes are normally one or two digits out, so you may wish to try variations on what you thought you set.

Apart from that you can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything as is currently the case. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

Jul 14, 2011 | Master Lock 5400d: Portable Select Access...

1 Answer

Lost combination for bicycle master lock. It has 229T sticker on it.


If you can remember an numbers in the combination you will just have to try all other numbers in combination until it opens

Apr 30, 2011 | Master Lock 8143DSG Combination Cable Lock...

1 Answer

How can i reset my master lock


The only way to open your lock is by using the correct combination. There is no other way.

You can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination

Oct 07, 2010 | Master Lock 5400d: Portable Select Access...

1 Answer

I've had a masterlock 5400d master lock for half a year and I forgot the password and it contains a special key.


The only way to open your lock is by using the correct combination. There is no other way.

You can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

Sep 21, 2010 | Master Lock 5400d: Portable Select Access...

1 Answer

I lost the combination and can't open it


The only way to open your lock is by using the correct combination: there is no other way.

You can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

Jul 07, 2010 | Master Lock 5400d: Portable Select Access...

1 Answer

I lost my lock combination for a light blue master lock is there any way to get it the serial number is 8000109


The only way to open your lock is by using the correct combination: there is no other way.

You can either try every possible combination or you will need to contact the manufacturer. They will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

May 08, 2010 | Master Lock 5400d: Portable Select Access...

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