It is not about only the lock but about the whole locking machanism around the (outsourced) lock. Most of the current “brand name” manufacturers use padlocks that are somehow modified as to fit into the mechanism that at once ensures tight fit and precludes direct brute force attacks on the padlock itself.
Multiple times I've made fun of the MySteel's solution to that conundrum. But for me it looks like a way that makes most sense as the only reason why it needs modified padlocks is the protection against cutting the padlock with bolt cutters and well, the padlock itself is probably weakened enought by the milled groove, that there are another simple bruteforce attacks on it, that are simpler than cutting 3mm of hardenned steel.
