﻿GET_GEVOMechL2_01_01_01_04 - ANIMATION Screen
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Threaded fasteners are classified by shape, material, and finish, which are specified by industry standards.

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In the United States, the American Society for Testing Materials (ASTM) sets the standards, which are often referred to as Unified, American, or Inch standards.

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In Europe, the International Standards Organization (ISO) sets the standards.

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The Metric fasteners are specified by the ISO.

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Both the Inch and Metric standards use a symmetrical V-shaped thread profile.

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The angle of the threads is 60 degrees with flat crests and rounded roots.

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The pitch of a thread has been standardized for coarse, fine, and extra fine threads, for various diameters.

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The Inch standard identifies pitch as the number of threads per inch, and the Metric standard identifies pitch as the distance between corresponding points on adjacent threads.
