Screw Threads: Introduction and Gauging | Metrology
2021-1-6 · For single-start thread. Lead = pitch . For multi-start thread, Lead = pitch x No. of starts. 8. Depth (h): It is distance measured normal to the axis of the screw between crest and root of the thread. 9. Parallel Screw Thread: This term refers to threads cut on a cylindrical surface.
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