MasterLock 1500iD Forgot Combination? Here’s How to Open It

Key Takeaway

  • If you’ve forgotten the password to Master Lock 1500iD, there is no way to open the lock except disassembling the lock. 
  • To disassemble the lock, unscrew the screws located at the back-side of the lock. Then manipulate the wheels inside the lock to align them correctly. 
  • Afterward, you reset the combination using a reset button slider and set a new combination. Finally, you reassemble the lock by putting the cover back on. 
  • Obviously you can always cut open the lock in emergency situations but that would destroy the lock.

We’ve all been there before – that moment of panic when you realize you’ve forgotten the combination to your reliable Master Lock 1500ID Speed Lock. It’s a frustrating situation that can leave you feeling helpless and locked out of your own possessions. But fear not, my friend, because help is at hand.

In this informative blog post, I’ll share with you a step-by-step guide on how to open your Master Lock 1500ID when you’ve forgotten the combination. 

Please note that there is no straightforward way to unlock the lock (without damaging the lock) except disassembling it and then working with internal components. However you can always cut open the shackles with cutters. 

Resetting Master Lock 1500ID Without Combination

If you find yourself in a situation where you have forgotten the combination to your Master Lock 1500iD and have legitimate access rights to the lock, here is a guide on how to proceed to resetting the lock without the combination. Please exercise caution and ensure you have the necessary authorization before proceeding with the following steps.

Step 1: Removing the Lock’s Cover

To begin the process of opening the Master Lock 1500ID, you will need to remove the lock’s cover. The cover houses the dial and internal components of the lock. Start by locating the screws on the back of the lock. There are three screws: one in the center with shaved-off sides and two triangle screws on the sides. Use a flathead screwdriver and a torque driver to remove these screws. Apply firm pressure while turning to unscrew them.

Practical Tip: Since the center screw is half cut, you might find it difficult to open it up with a flathead screwdriver. And that’s why a hammer or torque driver would come into the picture.

Removing the Lock's Cover

Step 2: Accessing the Lock’s Internal Mechanism

Accessing the Lock's Internal Mechanism

Once you have successfully removed the screws, you can take off the lock’s front cover. The front cover houses the dial and a square piece responsible for moving the lock’s internal components. Carefully detach this square piece from the lock. You will now have access to the lock’s internal mechanism.

Step 3: Manipulating the Wheels

Inside the lock, you will find four small wheels that control the lock’s combination. These wheels need to be aligned correctly for the lock to open. Rotate the wheels until you see a gap on the opposite side. This gap needs to be on the other side so that a metal piece from the back of the lock can fit into it.

Step 4: Resetting the Combination

Now that the wheels are correctly aligned, you can proceed to reset the combination. To do this, place the reset button slider (located on the back of the lock) in the upward position using a pencil or any suitable tool. Next, reinsert the lock’s shackle into its designated position and press down firmly. This action will put the lock in reset mode, allowing you to set a new combination.

Resetting the Combination

Step 5: Setting a New Combination

With the lock in reset mode, you can choose a new combination that you can easily remember. Ensure that the new combination is secure yet memorable for your convenience. Once you have set the new combination, test the lock by pulling up the shackle. If done correctly, the lock should unlock, indicating that your new combination is successfully set.

Step 6: Reassembling the Lock

Now that you have successfully opened the Master Lock 1500ID and set a new combination, it’s time to reassemble the lock. Carefully place the square piece back into its original position, ensuring that it engages with the lock’s internal mechanism. Then, align the front cover and securely fasten the screws using the flathead screwdriver and torque driver.

Resetting Master Lock 1500 Using Combination

Master Lock 1500 is a renowned combination lock revered for its exceptional durability and top-notch security features. To unlock this lock, you must carefully turn the dial using the correct combination.

Here’s how,

Finding the Combination

When you first receive your Master Lock 1500ID, you might encounter some confusion. The combination is not printed on a tag attached to the lock, as you might expect. To locate the combination, follow these steps:

  • Step 1: Turn the lock around to the backside, where you’ll find dashed lines indicating the presence of hidden information.
    X-Acto knife
  • Step 2: Take an X-Acto knife and carefully cut along these dashed lines. Apply gentle pressure as there is a piece of plastic behind the paper.
  • Step 3: Once you’ve removed the paper, you’ll discover the directions for finding the combination.
  • Step 4: Additionally, there are stickers included with the lock that you can use to customize its appearance.

Opening the Lock

To open the Master Lock 1500ID, it’s crucial to follow the correct procedure. Here’s a step-by-step guide:

  • Step 1: Begin by squeezing the shackle twice before entering the combination.
    squeezing the shackle
  • Step 2: Input your combination by turning the dial.
  • Step 3: With the correct combination entered, the lock should now open.

Setting Your Own Combination

If you prefer to set your own combination for added security and convenience, the Master Lock 1500ID allows you to do so. Follow these instructions:

  • Step 1: Open the lock using your existing combination.
  • Step 2: Place the lock in the open position.
  • Step 3: Look for a small switch on the back of the lock and switch it from “down” to “R” (reset). You can use any regular pen or pencil for this step.
  • Step 4: Close the lock and squeeze the shackle twice. This action resets the combination.
  • Step 5: Now, lift the shackle to open the lock, and you’re ready to set your new combination.
  • Step 6: Turn the lock around with the shackle in the open position.
  • Step 7: Using a regular pen or pencil, switch the small switch back from “R” to “down.”
  • Step 8: Close the lock and firmly squeeze the shackle.
  • Step 9: Your Master Lock 1500ID is now reset with your personalized combination.

However, if you find yourself in a situation where you’ve forgotten the combination or have accidentally reset it incorrectly, opening the lock can seem like a daunting task, but it is possible.

Frequently Asked Questions

Q1. Can I use the Master Lock 1500ID for outdoor purposes? 

Answer – The Master Lock 1500ID is specifically designed for indoor use or areas protected from harsh weather conditions. While it may withstand occasional exposure to light rain or moisture, prolonged exposure to the elements, such as heavy rain, snow, or extreme temperatures, can potentially affect the lock’s performance and durability.

Q2. Is there any way to recover a forgotten combination without opening the lock?

Answer – For security reasons, Master Lock and other reputable lock manufacturers do not typically provide methods to recover a forgotten combination without opening the lock. This ensures the integrity of the lock and prevents unauthorized access. The method outlined in this blog post provides a reliable way to regain access to the lock by resetting the combination.


The Master Lock 1500iD Speed Lock is a convenient and secure option for keeping your belongings safe. However, forgetting the combination can be frustrating. By following the instructions outlined in this blog post, you can easily retrieve a forgotten combination and even set your own personalized code. Remember to keep your combination written down in a safe place to avoid any future mishaps. Now, go ahead and enjoy the convenience of your Master Lock 1500ID without any worries!

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Hey! I am Mark. Though I am not a locksmith by profession, but locks have always fascinated me since my teens. And it all started when I got locked out of my house and I had to pick the lock. Since then it has become my hobby to learn more about different kinds of locks, understand their working and methods to pick them up. In due course of time, I have also become better aware of how installing the right lock goes a long way in ensuring iron clad security. I aim to share my passion (about locks) through this blog. If you are also passionate about picking locks or are just looking to beef up the security, hop on the ride.