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Also referred to as roll, tension and expansion pins, they are hollow and slotted lengthwise to create tension. These self-retaining spring Pins are made of uncoated carbon steel, which is stronger than 18-8 stainless steel and as strong as Type 420 stainless steel. They are installed by two easy operations, just drill and drive. Useful for many purposes, they can be used as electrical connectors in patch board circuits, terminals, fixtures for wire harness, actuators for drum, to secure pulley or gear to shaft, hinges, positioners, and studs. Spring pins are flexible, permitting a wider tolerance than other pin types, such as drive pins, taper pins, collar pins. Beveled ends make starting easy.