There are lock companies that manufacture "Bump Proof" locks (mine being one). These locks have the same security features of their coin-op, gaming and vending locks. Any pin tumbler lock can be bumped. The way my company and other high security manufacturers prevent bumping is by employing a keyway mechanism that is not based on pin tumblers along with a non-duplicatable controlled keyblank.

In the coin-op, gaming and vending industries, no one with a security concern uses pin tumbler locks. Feel free to contact me if you'd like more info.

Yours,

Rich Morahan