BlockGuard® Anti-Shim Technology

BlockGuard™ Logo - Anti-shim Technology

Available Today!

Master Lock has reinvented the padlock, with BlockGuard ® Anti–Shim Technology.


Shimming – violating a lock by inserting a foreign object into
the latch mechanism. It's an industry–wide issue!


A Man attempting to shimming a padlock

New Patent Pending BlockGuard® Anti–Shim Technology – a new latching mechanism that is designed to stop shimming! Learn More

BlockGuard® is standard on Models 1502 and 1525 with supervisory key override.


Example of a stopped shim due to the BlockGuard® technology

Only available through your
locker lock distributor –

Not available in retail stores.

Click to watch video with Brightcove player! Click to download Product Literature 7000-0558 (PDF file)