Threads Per Inch, a specification of bolts.
View attachment 5392
http://174.143.245.138/?tag=unc
See http://www.engineershandbook.com/Tables/uncunfthreadsperinch.htm for more.
View attachment 5392
http://174.143.245.138/?tag=unc
See http://www.engineershandbook.com/Tables/uncunfthreadsperinch.htm for more.
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