Contact Master Lock and request a set of replacement keys. This step requires that you know the identification number printed on your old set of keys. See the "Resources" section below for Master Lock's contact information.
Master Lock imports padlocks, combination locks and other security products for industrial and commercial use. The company's No. 3 padlock is a commercial grade keyed lock encased by a hard laminated shell. Master Lock's No. 3 padlock is intended to secure tool cribs, construction equipment, vending machines and storefront or business gates. Because of this lock's resistance to cutting and picking, a replacement key should be obtained if you wish to open it.
Bring your key number to a hardware store or professional locksmith to have it duplicated.
Take your No. 3 padlock to a hardware store or professional locksmith if you have lost or do not remember your key number. The technician will make an impression of your lock and create a new set of keys which will unlock it.
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