Means 'remainder.' The magic number with Master locks is four. You need to find the modulus of the last digit of your lock and four. For my lock, the last digit is 19. Let's do some long division! 4 into 19=4, and 4 times 4 is 16, and 19-16=3, so we have 4 remainder 3. So, 19 Mod 4 (sometimes stated 19%4) is 3. The Master Lock chart references the key cut to the lock serial number Your organization may find it useful to keep records by serial number of which employee is assigned a specific lock Please contact Master Lock Customer Service to define and order your Master Key System at 800-308-9244.

• Master Lock Serial Number List By Lars Kirmser
• Master Lock Serial Number List For Singer Sewing Machines
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• Master Lock Serial Number List

If your lock has a serial number, you can submit a lost combination form through our website. Important: the lock must not be attached to anything.

Please see examples of a serial number if you are unsure if your lock features one.

Note: Due to increased security concerns nationwide, Master Lock recognizes the heightened need for additional safety measures. We cannot provide lock combinations in response to phone, fax or email requests.

Submit a Lost Combination Form

• Confirm that your lock features a serial number prior to submitting a Lost Combination Form. Please see examples of a serial number if you are unsure if your lock features one.
• Print out the Lost Combination Form.
• Have your Lost Combination Form notarized by a Notary Public to prove you are the owner of the lock. You can include up to 6 combinations on one notarized form.
• Note for inmates at a correctional facility: In addition to the Lost Combination Form, you must submit your request on official prison facility letterhead. In lieu of notarization, the Lost Combination Form must be signed by a prison facility official.
• Submit your form to:

  Master Lock Warehouse
  24 North Free Port Drive
  Nogales, AZ 85621

• Once the request is received your combination will arrive in approximately 4-6 weeks.

Requests for more than 6 combinations are considered a chart. Fax your request on official letterhead along with the completed Chart Request Form to 1-800-308-9245. The cost for hardcopy charts or charts on CD is $50. A remittance request for the fee will accompany your chart. E-Mail charts are free of charge ($100 if full history is requested). Please allow up 2-4 weeks from the receipt of your request to process your chart.

To open a Titanium Series combination padlock model #2050XD or 2051XD, follow these steps:

1. Turn the dial 3 times to the right and stop on the first number of the sequence
2. Turn the dial to the left, pass the second number of the sequence and stop on it the second time around
3. Turn the dial to the right and stop on the third number of the sequence
4. Push the button while pulling the shackle

To open a high security combination lock model 2002 or 2010, follow these steps:

1. Turn the dial 3 times to the right and stop on the first number of the sequence
2. Turn the dial to the left, pass the second number of the sequence and stop on it the second time around
3. Turn the dial to the right and stop on the third number of the sequence
4. Turn the dial to the left until it stops
5. Hold dial at stop and pull up on shackle to open lock

Resettable combination locks have a combination that is assigned by the owner of the lock. Therefore, Master Lock does not have record of the combination that the owner set. The lock cannot be reset unless it is in the open position. If your lock is attached to something, you will need to call a locksmith for removal. Please note that Master Lock does not reimburse for Locksmith services and/or fees.

Contact your local hardware store or locksmith. (Master Lock's part number for the reset tool is K175).

We suggest that you lighten the copy as much as possible. If you can not read the serial number after you make the copy - that is ok, just write it on the side of the copy. What we need more importantly, is to clearly see that it is not attached to something.

For security reasons Master Lock will not provide lost combinations if the lock is attached to anything.

You can obtain the Activation Code through one of the following options:

1) Visit a Master Lock distributor/retailer

• Bring the lock to a Master Lock distributor or retailer. The lock must not be attached to anything.
• Ask the distributor or retailer to contact Master Lock for the Activation Code on your behalf using the Lock/Device ID which is engraved on the back of the lock and noted in the app under About This Lock as 'Device'. The Lock/Device ID starts with the letter A and is followed by 5 numbers or letters. US distributors may call 1-800-308-9244. Canadian distributors may call 1-800-227-9599.
• Please note that although Master Lock does not charge for this service, some distributors or retailers may charge a fee.

– OR –

2) Submit an Activation Code Retrieval Form

• Print out the Activation Code Request Form from a Printer Friendly Page or download the Bluetooth Activation Request Form.
• Have your Activation Code Request Form notarized by a Notary Public to prove you are the owner of the lock. You can include up to 6 Activation Codes on one notarized form.
  *Note for inmates at a correctional facility: In addition to the Activation Code Request Form, you must submit your request on official prison facility letterhead. In lieu of notarization, the Activation Code Retrieval Form must be signed by a prison facility official.
  
• Mail your form to:
  Master Lock Company, LLC
  Bluetooth Smart Padlock Activation Code Request
  6744 S Howell Avenue
  Oak Creek, WI 53154
• Once the request is received, your Activation Code will arrive in approximately 1-2 weeks (if selecting mail as the delivery method.)

Key Control Locks

Note: this section is for School Administration only.

Control Chart: Each order of key control locks comes with a paper control chart that contains the serial number and the corresponding combination numbers. A school’s complete charted system is kept on file by dudley^®.

Even though a paper control chart is forwarded with each order, you receive said data in an Excel-file by email.

Refer to caption Electronic Control (EC) on our School Order Form under data for cost in relation to the above captioned option.

If you choose one of the above captioned options, make sure you specify the one you are selecting and if by e-mail, kindly provide us with the e-mail address.

For further information, please do not hesitate to contact our Customer Service department at 1-800-227-9599.

Lost Combination Retrieval

Only serialized locks may have the option of combination retrieval. In order for us to be able to provide you with the lost combination number(s), we will require the serial number(s) of the lock(s) in question. However, only records from the last 10 years MAY be available.

For your information, the serial number is engraved at the bottom of the lock or on the back of the lock for the DY1525 or DYA400K.

A) My lock does not have a serial number:

To provide enhanced long-term security, Master Lock has discontinued imprinting a serial number on the lock body on combination locks sold through retail locations. For greater convenience, we encourage consumers to store their combination at our secure website, Masterlockvault.com, which is easy to use and offers 24/7 access. Unfortunately, we are unable to provide combinations for non-serialized locks. Please see examples of a serial number if you are unsure if your lock features one.

B) My lock has a serial number:

Please see examples of a serial number if you are unsure if your lock features one.

Master Lock Serial Number List By Lars Kirmser

Choose from one of the two options below to obtain your combination:

Note: Due to increased security concerns nationwide, Master Lock recognizes the heightened need for additional safety measures. We no longer provide lock combinations in response to phone, fax, or email requests.

1) Visit a Master Lock Distributor/Retailer

• Bring the lock to a Master Lock distributor or retailer. The lock must not be attached to anything.
  IMPORTANT: If the lock is not brought to the retailer or distributor, we will not release the combination.
• Ask the distributor or retailer to contact Master Lock for the combination on your behalf and we will validate ownership through them. US distributors may call 1-800-308-9244. Canadian distributors may call 1-800-227-9599.
• Please note that although Master Lock does not charge for this service, some distributors or retailers may charge a fee.

- OR -

2) Submit a Lost Combination Form

• Confirm that your lock features a serial number prior to submitting a Lost Combination Form. Please see examples of a serial number if you are unsure if your lock features one.
• Print out the Lost Combination Form from a Printer Friendly Page or download a PDF file.
• Have your Lost Combination Form notarized by a Notary Public to prove you are the owner of the lock. You can include up to 6 combinations on one notarized form.
  Note for inmates at a correctional facility: In addition to the Lost Combination Form, you must submit your request on official prison facility letterhead. In lieu of notarization, the Lost Combination Form must be signed by a prison facility official.
• Submit your form to:
  Master Lock Warehouse
  1600 W. La Quinta Rd
  Suite/WHSE # 1
  Nogales, AZ 85621
• Once the request is received, your combination will arrive in approximately 4-6 weeks.

Store your combination at www.masterlockvault.com – a FREE service from Master Lock! The Master Lock Vault provides a safe & convenient place to store all of your confidential data for quick & easy access from your PC, iPhone, or any other mobile devices!

Phone: 1-800-227-9599
E-mail: cce@mlock.com

Warranty

We offer a limited lifetime warranty on all dudley products. Liability is limited to the replacement of our product only. The warranty does not cover damage resulting from mis-use or abnormal abuse.

All defective locks must be returned to us freight or postage prepaid (Collect shipments will not be accepted). Therefore, to reduce and avoid unnecessary shipping costs for locks beyond the guarantee period, we suggest that you first fax or e-mail the serial number of the defective locks to verify if still on warranty. Fax and e-mail address as follows:

Fax: 1-800-229-0081
E-mail: cce@mlock.com

Master Lock Serial Number List For Singer Sewing Machines

Once your list has been verified, a Customer Service Representative will advise you which locks are still under warranty and how to proceed. Should defective locks need to be returned to our attention, we will provide you with a RA (Return Authorization) number which is required to be referenced on your school letterhead.

Instructions

Master Lock Serial Number List Free

Click the PDFs below to reset your combination.

Master Lock Serial Number List

• CLAW MINI™ (DYBP1AST)
• THE CYCLONE™ (DYCL51AST)