pin slotAlso 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 tensionSolution: use bolts for clamping loads, spring pins for locating, and shear pins for taking shear loads. We found that spring pins locate almost as well as dowels (and much easier to install),