Locks are relatively simple mechanical devices if you understand how they work and padlocks are no different.

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Padlocks are made in a wide range of sizes from miniature masterpieces of only a few millimeters to huge pieces a foot or more in size. Padlocks also range greatly in their level of security. The vast majority is simple spring mechanisms but some are high security locks using sophisticated keys or combination locks. Most padlocks are simple to look at but many are works of art.

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The weakness of most modern padlocks is the hasp they attach to and the fact that they are exposed to simple attack with a sledge hammer or a pry bar. Most medium quality padlocks can be quickly dispatched with a quick blow of a hammer.

Padlocks come in various sizes, styles and complexities. There are as many mechanisms as there are makers and there seen to be more types of padlocks than any other lock.

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Padlocks use almost every form of metalworking including both forging and casting, and have been made from almost every common as well as precious metals. Iron, steel and brass are most common but padlocks have also been made of stainless, Damascus, silver gold and platinum.

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Padlocks are commonly made in form follows function shapes but they are also made in every geometric shape as well as that of animals, birds and fish.

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The simplest padlock mechanism is a "spring" lock. This is a simple arrangement where the spring or a lever actuated by a spring latches the lock and a key simply pushes the spring to open the lock. Push pins, screw and the familiar bit type key are used.

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Occasionally these locks will have wards. The most common types are cylindrical wards on the inside faces of the case.

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Padlock cases are made either by forming two shallow boxes which are assembled with short shouldered studs that are riveted on the outside, or are two flat plates with side pieces also held together with the same short riveted studs.

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While the lock is being built the studs are riveted to the back of the case and the parts then fitted. When everything is complete the front cover is riveted to the rest. Once assembled the padlock cannot be disassembled without cutting off or drilling out the rivets.

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On some locks the rivets are low pan head types and on heavy locks and on brass locks the heads are countersunk and then finished flush. Modern locks like the Yale are full of holes filled with press fit or bradded plugs that are finished flush so that you cannot see them.