Where is the master lock serial number?
Robert Miller
Published Mar 19, 2026
Where is the master lock serial number?
Make a photocopy of the back of the Master Lock. The photocopy must clearly display the lock’s serial number. Although not required, you should also make a copy of the form you took to the notary for your records.
How do I open my Master Lock if I forgot the combination?
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.
How do you open a 4 digit Master Lock combination?
How to Open a 4 Number Combination Lock
- Look for your combination number.
- Set the first digit of the combination.
- Set the second digit of the combination.
- Set the third digit of the combination.
- Set the fourth digit of the combination.
- Pull the shackle to unlock.
How do you open a Master Lock with a serial number?
To open a standard Master Lock combination lock (1500D): Turn the dial 3 times to the right and stop on the first number of the sequence. Turn the dial to the left, past the first number of the sequence, and stop on the second number. Turn the dial to the right and stop on the third number of the sequence.
How do you unlock a 4 digit combination lock if you forgot the combination?
If you forgot a bike lock combination or the digits to a padlock with a dial, you can try to reset it. Pull on the shackle until you see the wheels turn. When the wheel sticks or catches, move to the next wheel and continue through all the wheels.
How do you unlock a Kensington laptop lock?
How to Unlock a Kensington Combo Laptop Lock
- Press in on the unlock button and twist the first of the four numbered dials until the first number in your combination is set on the lock.
- Repeat Step 1 with the second, third and fourth number dials to enter the rest of your combination.