The automotive and electrical industries use coiled pins in such products as steering boxes and columns, pumps, electric motors and circuit breakers. They are also used as pivots and axles, for alignment and stopping, to fasten multiple components together-such as a gear and shaft-and even as ejector pins to remove motherboards from PCs. Typical materials for coiled spring pins include high carbon steel, stainless steel and alloy 6150.Ĭoiled pins are used extensively in cosmetic cases, automotive door handles and locks, and latches as hinge pins. Ĭoiled pins are commercially available in three different duties, standard (ISO 8750), heavy (ISO 8748) and light duty (ISO 8751), which provide for a variety of combinations of strength, flexibility and diameter to suit different mating host materials and performance requirements. Coiled spring pins were invented by Herman Koehl circa 1948. Coiled pins continue to flex after insertion when a load is applied to the pin thus providing excellent performance to counter fatigue in dynamic applications. When coiled spring pins are installed, the compression starts at the outer edge and moves through the coils toward the center. The spring action of the pin allows it to compress as it assumes the diameter of the hole. Coiled spring pins have a body diameter larger than the recommended hole diameter and chamfers on both ends to facilitate starting the pin into the hole. Coiled spring pins Coiled spring pin.Ī coiled spring pin, also known as a spiral pin, is a self retaining engineered fastener manufactured by roll forming metal strip into a spiral cross section of 2 + 1⁄ 4 coils. There are two types of spring pins: slotted spring pins and coiled spring pins. Spring pins may be used to retain a shaft as a journal in a plain bearing, as a type of key to fasten one shaft to another, or to precisely fasten flat faces of mating parts together through symmetric hole locations. The force exerted by the pin against the hole wall retains it in the hole, therefore a spring pin is considered a self retaining fastener. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole. Mechanical fastener that secures the position of two or more parts relative to each other Slotted spring pin (1) and washer (2) used to secure a shaft (3).Ī spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other.
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