Few People Know What the Small Loop at the End of a Safety Pin Is For
Safety pins come out of the sewing kit when a hem drops, a zipper breaks, or fabric needs to stay in place. The sharp point and clasp have clear jobs, but the small loop at the opposite end gets less attention. That curl in the wire gives the pin its spring action, helping it open and return toward its resting shape. What the small loop does Squeeze an open safety pin and the pointed arm moves toward the clasp. As you do, the coiled wire flexes and stores energy. Release your grip before fastening it, and the arm springs back. The opening is the space inside that coil. Its purpose comes from the wire curved around it, which forms a spring within the pin itself. Walter Hunt’s 1849 patent describes a pin made from one piece of wire that combines a spring with a clasp. The loop is part of that working design. How the loop and clasp work together Closing the pin means pressing the pointed arm inward and guiding its tip beneath the clasp. Once seated, the spring’s outward pressure h...