![]() As the barrel rotates it releases the locking mechanism that slots into the shackle’s notches. When you put your key into the padlock the pins are moved to align in such a way that the barrel can be turned. Each pin is a different height but matches the key’s profile. Inside the casing are a number of spring-loaded pins that slot into holes in the barrel stopping it from being turned without the key. Inside the lock’s casing there is a locking mechanism which fixes into notches on the shackle preventing the shackle being pulled upwards when it is locked. When you put your key into the lock barrel (also known as a tumbler) you turn the barrel and the shackle pops out at one end, allowing you to move the shackle. ![]() The most obvious part of a padlock is the U-shaped shackle which sits inside the padlock’s body.
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