A Spring Pin is a type of fastener that secures the position of two or more parts of a machine relative to each other. Slotted Spring Pins are cylindrical pins rolled from a strip of material with a slot to allow the pin to have some flexibility during insertion. Slotted spring pins are also known as roll pins. Spring pins have a body diameter which is larger than the hole diameter. Spring Pins are chamfered to help start the pin into the hole. The spring action of the pin allows it to compress as it adapts to the diameter of the hole. The force exerted by the pin against the hole wall keeps it in place. A Spring Pin is considered a self-retaining fastener and is designed for use in double shear applications.