Root and Crest of a screw thread and how they affect the Thread Height

🔹A shot video with a clear explanation of the thread terms Height, Crest, and Root and their relation.
🔹 The crest is a flat (or rounded) surface connecting the flanks at the top of the thread grooves, whether internal or external.
🔹 The root is a flat (or rounded) surface connecting the flanks at the bottom of the thread grooves, whether internal or external.
🔹 The distance between the crest and root is called the thread height. It is designated with hs for external threads and hn for Internal threads. Because in all threads, either the crest or the root must be relieved, the height is a reference dimension and is usually not controlled.
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