A 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. Spring pins have a body diameter which is larger than the hole diameter, and a chamfer on either one or both ends to facilitate starting the pin into the hole. The spring action of the pin ...
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http://en.wikipedia.org/wiki/Spring_pin
(from the article `pin fastener`) 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 ...
Found on
http://www.britannica.com/eb/a-z/s/145
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