Given the following thread specification: ½ - 28 UNEF – 2A 1) What is the pitch? __________ 2) How many threads per inch? ________ 3) What class of fit? __________________ 4) What is the diameter? ________________ 5) Completely describe the thread form. ____________________________________

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Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.