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Sex bolt
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A sex bolt, also known as a barrel nut,[1] barrel bolt, Chicago screw or post 
and screw,[2] is a type of fastener (nut) which has a barrel-shaped flange and 
protruding boss that is internally threaded. The boss sits within the 
components being fastened, and the flange provides the bearing surface. The sex 
bolt and accompanying machine screw sit flush on either side of the surfaces 
being fastened. It is normally chosen because of its low profile compared to 
other nuts. The sex bolt often has a built-in feature, such as a slot, to aid 
in tightening the fastener. Some sex bolts, more commonly known as 
architectural bolts, have knurled barrels to allow one-sided assembly. Binding 
posts are similar to architectural bolts in that they are designed to be 
assembled from one side, but they have teeth on the flanged surface to keep 
them fixed. They were originally designed for the printing industry to bind 
large catalogs together.[2]

[edit] References
  1.. ^ Nuts, 
http://www.jamestowndistributors.com/userportal/siteMap.do?action=map2&catId=189,
 retrieved 2008-11-28 . 
  2.. ^ a b Sex bolts & mating fasteners, 2008–2009, 
http://accuratemfg.com/CATALOGS/Architect%20Catalog%20Web%20Current.pdf, 
retrieved 2008-11-28 . 
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