Pin fastener, a steel pin, usually cylindrical, can keep machine parts in proper alignment or fasten them together. The illustration shows several types of pin fasteners in common use.
Among the various kinds of pins, the spring pin is a split tube with a slightly larger diameter than the hole into which it is placed. The pin is compressed when driven into the hole and exerts a spring pressure against the wall of the hole to create a frictional locking grip. These pins can be removed and reused without appreciable loss of effectiveness; they are widely used for attaching lightly loaded pulleys and gears to shafts.
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