A-B11960540SM-AI PIN, SPRING, .312 XOne New Aftermarket Replacement Spring Pin for Murray, Simplicity, and Snapper Lawn and Garden Equipment This spring pin (also commonly called a roll pin or tension pin) is a hollow, slotted fastener used throughout Murray, Simplicity, and Snapper outdoor power equipment assemblies. Spring pins compress radially on insertion and apply continuous outward pressure against the hole wall, locking securely in place without additional hardware. They are