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"  Shock Test To measure the locks&amp;#039; resilience against brute force\u2014the kind they&amp;#039;d feel from a sledgehammer\u2014we used an MTS Systems shock test machine to drop a 32-pound weight on them. Franklin: One drop from 55 inches (the machine&amp;#039;s max height) popped the lock. Medeco: Three drops and the lock was reduced to a cloud of plastic and steel shrapnel. Master: The toughest lock slowly pulled apart over the course of four drops from max height. OnGuard: Just one drop smashed the lock&amp;#039;s plastic shell and unlatched the shackle. Winner: Master Bolt-Cutter Test Bolt cutters can be a burglar&amp;#039;s best friend. We used a platform scale to measure how much force bolt-cutter handles needed to snap the shackles. Franklin: Applying just 95 pounds of pressure to the bolt cutter&amp;#039;s handles snapped the weakest shackle. Medeco: It took 110 pounds of force to snip the shackle. Master: The second-toughest shackle broke after 200 pounds of squeeze. OnGuard: The toughest lock was the only one to survive this test\u2014after 270 pounds of pressure, the bolt-cutter teeth began to bend, but the shackle was left with just a small groove. Winner: OnGuard   Tensile Test How much force does it take to pull the shackle out of the cylinder? We used an Instron tensile testing machine to find out. Franklin: The shackle on the weakest lock was pulled free with just 1024 pounds. Medeco: The runner-up met its end with 6436 pounds of force. Master: It took a whopping 7745 pounds of force to pull the winner loose.  OnGuard: 3072 pounds of pull and the lock was sprung. Winner: Master  Salt-Fog Test To simulate sitting outside a shed through years of acid rain and environmental exposure, we left the locks in a chamber for an intense weeklong onslaught of sulfur-dioxide salt fog.  Franklin: A week of sulfur dioxide left the Franklin permanently stuck shut.  Medeco: We had high hopes for Medeco&amp;#039;s &amp;quot;All-Weather&amp;quot; lock. And although it survived the sulfur dioxide, curiously, it wouldn&amp;#039;t open after seven days with a weaker, nonsulfuric salt fog. Master: The Master left the test looking like it had been submerged on the Titanic for a century, but it still opened. OnGuard: This lock finished looking like we&amp;#039;d plucked it from a swamp but still working. Winner: Tie between Master and OnGuard       Gunshot Test In Hollywood heists, burglars frequently shoot open locks. To see how these padlocks handle bullets, we shot the cylinders with a rifle from 80 feet away. Franklin: Although centered shots passed right through the lock, it took an off-center bullet from a .243 Winchester to actually spring it.  Medeco: A single centered shot from a .25-06 Remington left this lock unlatched\u2014and with a large exit hole. Master: Behold, the bulletproof lock\u2014the Master stopped .243 Winchester and Remington .25-06 shots in their tracks. Not even a pair of bullets from a .300 Winchester Magnum could pass through or open this lock. OnGuard: After one off-center shot from the .25-06 Remington, we were able to pull the lock open by hand. As with the Franklin, centered shots passed through the cylinder but failed to actually open it. Winner: Master, by a mile "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/security/reviews/a5913/can-your-padlock-withstand-a-bullet/>