http://t3.gstatic.com/images?q=tbn:AlWvjIOGKfgGpM:http://www.lrseries.com/resources/user/3e8714ab8837d3bc9db4f0221a62a24c3cd66a15/217778-STUD-3-8-UNC-X-3-8-BSF.jpg
a unc stud is an imperial threaded bolt without the bolt head.
there is such a thing.
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