Revision as of 13:20, 20 March 2023 edit 203.160.80.10 (talk) →‎History of standardization: removed some blabbity-blab gossip which did not improve the article or understanding of the subject ← Previous edit		Revision as of 17:38, 6 April 2023 edit undo 173.247.16.242 (talk) →‎Form: USC & USF corrected to UNC and UNF, which stand for Unified National Coarse and Unified National Fine respectively. Next edit →
Line 54: ===Form=== [[File:Different Thread Types Update.jpg\|thumb\|right\|260px\|Different threads including metric, ~~USC~~UNC, ~~USF~~UNF, BSW]]The cross-sectional shape of a thread is often called its ''form'' or ''threadform'' (also spelled ''thread form''). It may be [[Square (geometry)\|square]], [[Triangle\|triangular]], [[trapezoid]]al, or other shapes. The terms ''form'' and ''threadform'' sometimes refer to all design aspects taken together (cross-sectional shape, pitch, and diameters), but commonly refer to the standardized geometry used by the screw. Major categories of threads include machine threads, material threads, and power threads. Most triangular threadforms are based on an [[isosceles triangle]]. These are usually called ''V-threads'' or ''vee-threads'' because of the shape of the [[V\|letter V]]. For 60° V-threads, the isosceles triangle is, more specifically, [[Equilateral triangle\|equilateral]]. For [[buttress thread]]s, the triangle is [[wikt:scalene\|scalene]].

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