The term padlock is from the late fifteenth century. The prefix pad- is thought to be related to the Latin ped which may refer to the portability of a padlock; it is combined with the noun lock, from Old English loc, related to German loch, … 展开

A padlock is composed of a body, shackle, and locking mechanism. The typical shackle is a U-shaped loop of metal (round or square in cross-section) that encompasses what is … 展开

Combination
Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination.
A padlock was invented by John I. W. Carlson in 1931 (a … 展开

Images of closed padlocks (sometimes physical padlocks) are sometimes used to indicate that something is secure or inaccessible. 展开

There are padlocks dating to the Roman Era, 500 BC – 300 AD. They were known in early times by merchants traveling the ancient trade routes to Asia, including China. 展开

A quantitative measure of a padlock's tensile strength and resistance to forced and surreptitious entry can be determined with tests developed by organizations such as ASTM 展开

• Mästermyr chest
• Pin tumbler lock 展开