There are many application areas such as military and commercial vehicles, aircraft handling, disabled mobility aids and generally in alignment and locating applications.

QRP's can be categorised into locking type pins and non locking alignment pins where access from one side is available. Locking pins can be further divided into single or double action. An illustration of the differences can be found here

For applications where access to both sides is available and hole tolerances greater, a drop nose pin may be an option

Click on the pin for more information