How to Key a Master Padlock

Padlocks have shear pins inside the lock that a key contacts on the top and bottom to open a lock.
You can key several MasterLock padlocks to the same key.You can key several MasterLock padlocks to the same key.
The MasterLock universal padlock line has a modified lock cylinder that allows you to key the lock to an existing MasterLock key. This procedure allows you to key multiple locks to open with one key instead of special ordering several locks with the same key at a greater expense. You can key your own locks in just a matter of minutes with a rekeying tool.

Step 1

Insert a MasterLock key into a MasterLock universal padlock.

Step 2

Turn the padlock over so the shackle faces down and the key faces up. Place the padlock in a vise in this position.

Step 3

Insert a MasterLock rekeying tool over the key against the lock.

Step 4

Strike the rekeying tool with a hammer using medium force. Remove the rekeying tool. Remove the padlock from the vise.

Step 5

Turn the key in the padlock to open the shackle.

Things You Will Need

  • MasterLock universal padlock
  • MKP-1 MasterLock rekeying tool
  • Key
  • Vise
  • Hammer

Tips

  • When you key the lock once with a rekeying tool, it can not be rekeyed again.
  • MasterLock universal padlocks have a "UP" stamped into the bottom of the lock and the side next to it.

About the Author

Mary Lougee has been writing for over 10 years. She holds a Bachelor's Degree with a major in Management and a double minor in accounting and computer science. She loves writing about careers for busy families as well as family oriented planning, meals and activities for all ages.