How Do I Find The Combination To My Master Lock?

Combination locks are great for school, gym, and any other personal use lockers! However, losing your combination can be frustrating. Below we’ll cover ways to help you recover any lost combinations*, and our tips on preventing being locked out of your combination lock again!

*Please note that it is only possible to retrieve missing combinations if your combination lock has a serial number written on the back, and is not attached or locking anything. See the image below to ensure that your lock has a serial number.


If your combination lock does not provide a serial number, there is no documentation on which combination your lock may have. Unfortunately, this means that looking for documentation or old packaging may be the only way to recover your combination. If you are need of a new combination lock, visit us at to purchase one at a great price.

If your lock does provide a serial number, the easiest way to retrieve your combination is to take your lock to any local Master Lock Distributor in your area; think of Wal-Mart, Home Depot, Lowes, etc. A store associate at the customer service desk will be able to call the Master Lock Customer Service line at 1(800)308-9244 to retrieve your combination for you. It’s important to note that Master Lock will not release combinations to anybody other than authorized employees who can vouch that your lock is in hand, present, and free standing.



Now that you have access to your combination, we recommend you store it in a safe place. The best place for storing your combination is in the Master Lock® Vault®  – a FREE service from Master Lock that’s easy to use! The Master Lock Vault not only stores combinations, but other important documents such as passwords, tax documents, ID’s, etc.

School faculty and fitness club staff members can retrieve multiple missing combination charts online by filling out and returning this Combination Chart Form via fax to 619.444.5677.


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How to Reset Master Lock No. 175 and 176

How do I set or reset a Master Lock “Set-Your-Own” Combination?

What are “Set-Your-Own” combination locks?

Combination locks use rotary dials to unlock when in a specified sequence. With “Set-Your-Own” combination locks the user is able to define their own combination when the lock is open. This eliminates the common problem of lost keys. Common “Set-Your-Own” combination locks are the Master Lock 175 and 176.

Master Lock 175 and 176

The Master Lock 175 and 176 are brass combination locks. Brass locks are a common choice for areas that have harsh weather or during the rainier seasons because it is a metal alloy made of copper and zinc; which makes these locks very durable. Brass locks are one of the most economic choices for your security needs, and due to the alloy’s durability brass padlocks are ideal for caustic, marine environments.

The Master Lock 175 and 176 are nearly identical. The main benefit from purchasing a 176 is that it has a control key override just in case you don’t have the combination.


Resetting Master Lock No. 175 and 176

To reset the 175 and 176 you will go through the same process using the K175 reset tool.



1. Open the lock with the factory set (0-0-0-0) or the previously set combination. The lock must be set to the current combination, or you cannot reset it.



2. Insert reset tool (enclosed in package) in the hole on side of lock. Push reset tool in and turn 90 degrees (in either direction). Reset tool automatically stays in this position.




3. With the change tool still in the lock, set wheels to your desired combination.




4. Turn the reset tool back 90 degrees and remove. The Lock is now set to your new combination.




Now your lock should open when you put in your new combination.

Make sure to save your unique combination at or download the app to ensure you never lose your combinations again.

You can find the Master Lock Padlocks shown in this video here:




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What are Keyed Alike Padlocks?

Do you have more than one lock and don’t like carrying around a bunch of keys? Then you need a keyed alike system from

What does Keyed Alike mean?

Keyed alike is when one key can open many locks, providing the user with one-key convenience. offers many lock models keyed alike. You can create a keyed alike system with the same lock model or different padlocks that are used for many different applications. For example, these four very different locks can be unlocked by the same key.



Keyed Alike systems are perfect for industrial applications where the employee needs to access several padlocks. If you want to have the convenience of having one key, but don’t want to give your employees access to all the locks you can look into a more complex system, like a Master Keyed system. A Master Keyed system is like a Keyed Alike system, but you can create groups of locks that don’t share the same key. However, the Master Key can open all padlocks within the system.

If you already have a Keyed Alike system and would like to add more locks, you will need your key number, which you can find on the back of your key.


For some padlocks, you may find your key number on the padlock’s packaging.


Once you have your key number you can go to, and enter your key number where it asks if you have an existing key number.


Or if you would like some assistance creating your keyed alike set or you would like assistance with a more complicated system like a Master Keyed System, you can call Customer Service Number 1-800-778-2217.

To keep track of your key number for future reference or for Replacement Keys enter it in at or download the Master Lock Vault app, which is available in the Google Play Store or the App Store.

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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 1-800-778-2217.

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 1-800-778-221 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:


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


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What is a ProSeries® High Security – Solid Steel Padlock?

Master Lock ProSeries® Solid Steel PadlocksFeaturing Master Lock Model No. 6230 ProSeries® Solid Steel Rekeyable Padlock, Master Lock Model No. 7045 ProSeries® Shrouded Solid Steel Rekeyable Padlock, and Master Lock No. 7050 ProSeries® Solid Steel Rekeyable Padlock.
Master Lock ProSeries® Solid Steel Padlocks:
What is a ProSeries® High Security- Solid Steel Padlock?

The Master Lock Company currently manufactures six Solid Steel ProSeries® Padlocks: No. 6230, No. 7030, No. 7035, No. 7040, No. 7045, and No. 7050. These premium security solid steel padlocks are the strongest metal Master Lock® utilizes to manufacture padlocks. The heavy solid steel body is reinforced with chrome rustproofing to create a weather resistant finish. The No. 7030, No. 7040, and No. 7050 are all standard solid steel bodied padlocks, only varying in their body dimensions and shackle height. The No. 6230 is a rounded solid steel padlock. By adding girth to the padlock body the rounded shape provides extra security than the standard rectangular padlock. Finally, the No. 7035 and No. 7045 feature a shrouded shackle. The shroud, which is an added cover to protect the shackle, deters unauthorized entry.

Master Lock® Shrouded Padlocks

Master Lock® Shrouded Padlocks and Hidden Shackle Padlocks provide the greatest amount of physical security available. Both padlock styles obstruct unauthorized objects from getting to the shackle. A shrouded padlock features an extended body that adds an extra element of protection to the shackle. This added covering protects the shackle from bolt cutters and prying.

Chrome Plated Padlocks

Master Lock ProSeries® Solid Steel Padlocks are chrome plated. Not only does the chrome plating create a visually appealing finish, but it also provides extra security and is corrosive resistant. Even though Chrome is great for plating, you will not find padlocks or other items made out of solid Chromium. Chromium alone is a hard but brittle metal that needs to be partnered with a more substantial metal like steel for the ending product to be useful.

Best Used for:
Master Lock ProSeries®

These Solid Steel Padlocks are a part of Master Lock’s ProSeries®, a high security padlock line ideal for industrial and commercial use. ProSeries® padlocks feature hardened boron alloy shackles for superior cut resistance, dual ball bearing locking mechanism that resists pulling and prying, 5-pin & 6-pin cylinders, spool pins, and rekeyable cylinders.

For multiple lock usage, ProSeries® Padlocks are easy to order Keyed Alike and Master Keyed with the correct key number. Master Lock created the ProSeries® to have standard components across the line including small format interchangeable core padlocks, making ProSeries® padlocks ideal for locksmiths to rekey.

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Operating the Master Lock 1500iD Speed Dial™ Combination Padlock

Introduced in 2009, the World’s first directional combination padlock includes Master Lock’s patented technology that is faster, easier and more secure than a standard combination lock with anti-shim technology. The 1500iD uses directional movements of up/down/left/right to open the lock. However, many users have issues with their 1500iD. With this blog, and some help from Master Lock’s 1500iD Speed Dial™ Instructions [available in Instructions section], we are going to help answer all of the questions you may have so that you can successfully operate the Master Lock 1500iD Speed Dial™ Combination Padlocks.

Locating the instruction tag with the supplied preset combination for the Master Lock 1500iD seems to be one of the more difficult issues.


Please note that the preset directional combination will vary from lock to lock, so you will want to keep your instruction tag.

To remove your 1500iD from the packaging you will need to know how to open the lock.


The instructions reiterate “IMPORTANT: ALWAYS REPEAT STEP 1 EACH TIME YOU OPEN THE LOCK!” which is the most important step that when skipped will cause any user to be unable to open their 1500iD. Whenever you are going to unlock your 1500iD, be sure to squeeze/depress the shackle TWICE before entering your directional combination and opening your lock.

Now that you have located your preset combination and successfully removed your 1500iD Combination Padlock from its display packaging, you can set-your-own directional combination.


You may want to practice with the preset combination a few times to get the hang of using the lock before you change the combination. Once you feel confident using your Master Lock 1500iD, this resettable combination padlock will allow you to set-your-own combination anytime. Most importantly, after you change the combination on your 1500iD, be sure to write down or record your new combination somewhere you won’t lose it, because no one will remember it but you. You could write it down on your instruction tag or you could also use to save your combination.

Now that you are soon to be a Master Lock 1500iD Combination Padlock operational expert, here are the Master Lock recommended best uses for the Speed Dial™ directional combination padlocks:

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Lockout/Tagout FAQs Answered

497A Tag 410RED Safety Padlock Lockout Tagout LoTo

If you have read the OSHA standard on the Control of Hazardous Energy (Lockout/Tagout), Title 29 of the Code of Federal Regulations (CFR) Part 1910.147, then you are aware that it is a bit cumbersome and can leave you with questions. Fortunately, there is the publication booklet OSHA 3120. This handy resource has answers for just about all of the frequently asked questions that pertaining to Title 29 CFR Part 1910.147. As long as you are familiar with the OSHA Standards of Lockout/Tagout, the publication OSHA 3120 helps put the standards into context to help with understanding and documentation.

The OSHA 3120 publication starts with some basic background: What is “lockout/tagout”? Why do I need to be concerned about lockout/tagout? As the 8th most common cited violation by OSHA in the fiscal year 2013, from our last blog, it is important that all companies that have electrical machinery, and employees, be familiar with the standard.

In the publication, the section on OSHA Coverage answers the all important lockout/tagout question: How do I know is the OSHA Standard applies to me?

Other sections include Commonly Used Terms as well as contact information for OSHA Regional and Area Offices, OSHA Consultation Projects and OSHA-Approved Safety and Health Plans.

        OSHA Commonly Used Terms:

  • Lockout. The placement of a lockout device on an energy-isolating device, in accordance with an established procedure, ensuring that the energy-isolating device and the equipment being controlled cannot be operated until the lockout device is removed.
  • Lockout device. A device that uses a positive means such as a lock, either key or combination type, to hold an energy-isolating device in the safe position and prevent the energizing of a machine or equipment. Included are blank flanges and bolted slip blinds.
  • Tagout. The placement of a tagout device on an energy-isolating device, in accordance with an established procedure, to indicate that the energy-isolating device and the equipment being controlled may not be operated until the tagout device is removed.
  • Tagout device. A prominent warning device, such as a tag and a means of attachment, which can be securely fastened to an energy-isolating device in accordance with an established procedure, to indicate that the energy-isolating device and the equipment being controlled may not be operated until the tagout device is removed. (OSHA 3120, pg. 21)

We will close here with one of the most significant questions from the OSHA 3120 publication: What do I do if I cannot lock out the equipment?

Sometimes it is not possible to lock out the energy-isolating device associated with the machinery. In that case, you must securely fasten a tagout device as close as safely possible to the energy-isolating device in a position where it will be immediately obvious to anyone attempting to operate the device. (pg. 10)

OSHA 3120 (

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