U.S. Standard Hexagonal Bolt Head

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An illustration of the hexagonal bolt head showing measurements. The measurement of diameter, D, is used to calculate the dimensions. The diameter of the head and the nut, H, is 1 ½D ₌ ⅛, and the distance of T is half the diameter.

Source

Anthony, Gardner C. Elements of Mechanical Drawing (Boston, MA: D. C. Heath & Co., 1904)

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