Masterlock can provide a lock's combination based on its serial number, but this information is not public record and no customer can determine the combination based on the serial number alone. Masterlock no longer impri... More »

There are two ways to recover the combination of your Master Lock using the serial number. The first and probably the easiest is to take your lock to a Master Lock distributor or retailer. The second is to fill out the f... More »

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To reset the combination on a Master Lock model 643 lock, open the lock, turn the shackle one-quarter turn, and set the new combination while holding the shackle down. Release the shackle, align it with the lock opening,... More »

To open a combination lock, locate the arrow on the lock's dial, use the code or a series of combination numbers, and rotate the dial the required number of times in the clockwise and counter-clockwise directions to alig... More »

If a standard dial combination lock has a serial number, Master Lock can obtain the combination by looking at it in-store at a distributor or retailer. Alternatively, a lost combination form can be submitted to them by m... More »

If you forget the combination for a Master Lock, you can retrieve your combination from the company if your lock has a serial number and is not attached to anything. As of 2015, Master Lock has discontinued imprinting se... More »

Resetting a three-digit combination lock involves pressing a button or moving the shackle into the proper position and resetting the established combination. Then, set a new combination that you should record or remember... More »