Master Lock

Master Lock padlocks and lock boxes secure storage and manage shared keys for homeowners and small offices. A keyed padlock keeps access with the key holder; a lock box keeps a shared key at the property. Choose around who needs to get in.

Master Lock is an American security-products company headquartered in Oak Creek, Wisconsin. Founded in Milwaukee in 1921, it belongs to Fortune Brands Innovations. Its range includes padlocks, combination locks, safes and related security products.

Padlocks for storage

Master Lock’s range includes laminated-steel padlocks. The easy mistake is choosing by the size of the lock body. Fit starts at your latch: measure the hole the shackle passes through and the clearance it needs around the closed latch.

For access without passing a key around, the Magnum resettable combination padlock lets you set your own four-digit combination.

Master Lock provides combination-reset and lost-combination help, plus key-replacement and key-duplication support. Keep the instructions and a secure record of your combination. For a keyed lock, arrange a spare while you’ve still got a working key, and keep it outside the locked storage.

Lock boxes for shared keys

Master Lock offers a portable lock box for keeping a shared key at the property. On a combination-operated box, enter the combination and operate the release according to that box’s instructions. Leave room to reach the controls and open the compartment.

Master Lock Vault lets you use a phone as the key with compatible Bluetooth locks and lock boxes, so check hardware compatibility when selecting either.

Care and opening trouble

Master Lock recommends Master Lock Lubricant. Apply it according to its directions.

If a latch is pulling sideways on the shackle, relieve that pressure before trying the normal opening procedure again. Master Lock advises that a locksmith may need to remove a lock that stays closed despite the correct combination.

Selected specifications

Product	Model	Specification
Laminated padlock	6121	Laminated-steel construction
Magnum resettable combination padlock	M175XDLF	User-set four-digit combination; shackle length 1-1/2 in.; shackle width 15/16 in.; shackle diameter 3/8 in.
Portable lock box	5480D	Portable configuration

Frequently Asked Questions

How do you open a Master Lock lock box?

For a combination-operated Master Lock key box, enter the combination and operate the release as your box’s instructions describe. If it stays shut with the correct combination, a locksmith may need to remove it. Forcing the controls can turn an access problem into a broken lock.

How do you find a forgotten Master Lock combination?

Master Lock offers lost-combination help, and the process depends on your lock. Recovering a forgotten combination is different from setting a new one, so reset instructions alone may not solve the problem.

Can you make a copy of a Master Lock key?

Yes. Master Lock offers key-duplication and replacement support. Have the key and lock identification handy so you can establish which replacement or duplication option applies.

Can you set your own combination on a Master Lock padlock?

Yes, on a resettable model such as the Master Lock Magnum four-digit combination padlock. That feature lets you choose your code, but it isn’t a feature of every combination lock. Use the instructions for your particular lock when setting or changing the combination.

How does a Bluetooth Master Lock work?

A compatible Bluetooth Master Lock uses the Vault app to let your phone act as the key. You can give people temporary or ongoing access, which helps when access needs change. Its location display shows where the lock was last accessed or its last-known location; it isn’t continuous tracking.