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In technical drawing, "CH" typically stands for "Center Hole," indicating a hole that is located at the center of a feature, such as a circle or an object. The "HD" often refers to "Hole Diameter," specifying the diameter measurement of that hole. Together, "CH HD" conveys essential information about the location and size of a center hole in the design. This notation helps ensure accurate fabrication and assembly of parts in engineering and manufacturing.

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3w ago

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