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Master Lock® Lost Keys and Key Replacements

A common question we get at is, “I lost my keys, can you send me a new set?”

Step 1: Find Your Key Number

It is only possible to obtain a replacement key from Master Lock® if you have the key number. Your key number can be found on the back of your key or on the original packaging. For example, this key number is 3900. If your key is blank it is possible that it is a duplicate key, which only a locksmith will be able to help you copy. master lock cut key

Step 2: Call

Once you have your key number, you can call’s customer care at 1-800-358-0508. Or if you know your key model, you can visit and purchase the correct cut key. If you do not have the key number, it is possible to get an impression of your lock by a locksmith or a local hardware store. Please note that not all locksmiths will offer this service, and if they do, they will charge you a fee. For your security, there is no such thing as a “Master Key” that opens all Master Locks.

1525 Replacement Control Key 1500 series + control key For Schools and institutions that purchased Master Lock No. 1525 locks may order key replacements. However, they need to confirm their end user information before purchasing more keys. This may require sending a handwritten or faxed request for the keys on the school’s letterhead or sending an official PO. Please call’s customer care at 1-800-358-0508 for assistance with this process.

Lockout Tagout Keys safety lockout

OSHA has strict policies that select Safety Lockout products are "one lock, one key". For the employee's safety, select Master Lock® safety lockout products will require you to fill a request form before you can receive your replacement key. Once the request form is received, there will be a 10-15 business day lead time. Master Lock Products that require a request form include:

  • 410    
  • 410KAS    
  • 410AST
  • 411
  • 411KAS    
  • 411AST
  • 406   
  • 406KAS    
  • 406AST
  • S31    
  • S31KAS    
  • S32    
  • S33KAS    
  • S33
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