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There are three methods of representing screw threads on a drawing.
Screw thread representation present in this chapter is in accordance with the ASME Y14.6-2001 standard.
A detailed representation is a close approximation of the appearance of an actual screw thread.
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The schematic representation uses staggered lines to represent the thread roots and crests.
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The simplified representation uses visible and hidden lines to represent the major and minor diameters.
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Thread tables in the appendix of the Engineering Graphics Essentials book can be used to look up value for the;
If screw thread tables are not available, the minor diameter can be approximated as 75% of the major diameter.
