Lock and key

The common pin-and-tumbler locking mechanism has a series of spring-loaded pins, which are loaded into a series of small cylinders. Each cylinder has a bottom part, called a pin, and a top part, called a driver. Upon insertion of the key, the springs will be compressed as the key lifts the pin, pushing the driver into the upper chambers of the cylinder.
When the correct key is in the lock, the bottom and top pins align the space between them around a track similar to a ward, which is called the shear line. When all of the pins and drivers are aligned to clear the way for the shear line, the key will turn. An incorrect key will misalign one or more of the locking spring-loaded cylinders, blocking the key from turning by placing at least one of the pins or drivers in the way of the shear line.


  • Left Mouse Button – rotation in 3D space
  • Mouse scroll wheel – zoom
  • Click on parts of objects – get more information

This content is restricted to site members. If you are an existing user, please login. New users may register below.

Existing Users Log In