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Inch thread details
UN:A flat root contour is specified ,but it is necessary to provide for some threading tool crest wear, hence a rounded root contour cleared beyond the 0.25p flat width of the Basic Profile is optional.
UNR:In order to reduce the rate of threading tool crest wear and to improve fatigue strength of a flat root thread, the Design Profile of the UNR thread has a non-reversing continuous curved root tangent to the thread flanks at a depth of 0.625 H.)
UNC:Coarse-Thread Series
UNF:Fine-Thread Series
UNEF:Extra-Fine-Thread Series
UNS:Selected Combinations Other Threads of Special Diameters, Pitches, and Lengths of Engagement);