pin slotSlotted spring pins consist of a single coil of spring steel or stainless steel with an open slot sufficiently wide to enable the pin to reduce in diameter as it is driven into a hole of appropriateAlso known as Sel-loc pins, roll pins, tension pins, slot pins and s-lok pins. They are an un-headed fastener used to secure 2 or more parts. Spring pins are made from hh tensile steel and are very popular because it exerts constant tension