Solid Steel Non-Rekeyable Padlocks

These non-rekeyable padlocks offer hardened, chrome plated solid steel bodies that resist cutting, sawing and corrosion; hardened boron alloy steel shackles for superior cut resistance.

The non-serviceable five-pin APTC12 cylinder can be factory keyed to your requirements.

These padlocks are designed to secure job boxes and for other heavy duty applications. The HS model has stainless steel cylinder pins for increased drill resistance.

Enhanced keying option includes BumpStop® Advanced Cylinder Technology and Edge® Key Control.


Fits Knaack and Watchman IV job boxes and has stainless steel pins for additional drill resistance.


Fits older series Watchman job boxes.

Includes A50SS, A50HS, A50, A51 and A52, with specifications listed below.

American Lock - Build Your Own Solid Steel Non-Rekeyable Padlocks

Specifications for Non-Rekeyable Padlocks

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BumpStop® Advanced Cylinder Technology

BumpStop® Advanced Cylinder Technology is the default cylinder in all American Lock Government security products provide resistance to Bump attacks. These specifications are based on ASTM F883-09, ASTM International testing criteria for determining a pin tumbler padlock cylinder’'s ability to effectively resist break–ins using lock bumping techniques. BumpStop® cylinders have a reverse rake tapered driver pin, high performance spring and precision tolerance chamber, available in our 4–, 5– and 6–pin products. American Lock padlocks with BumpStop® Technology resist bump attacks.

For more information please view the BumpStop® video below or visit the BumpStop® Security website.

Download Video

Right Click Right-click on the 'Download Video' link to save the video (MP4 format) to your computer.