142.46.2Figure 3-23.-Use of line characteristics and conventions–Continued.The widths of the various lines on a drawingrequired for borderlines, outline of principalare very important in interpreting the drawing.DoD-STD-100C specifies that three widths of lineshould be used: thin, medium, and thick. As ageneral rule, on ink drawings, these three linewidths are proportioned 1:2:4, respectively.However, the actual width of each type of lineshould be governed by the size and the type ofdrawing.The width of lines in format features (that is,title blocks and revision blocks) should be aminimum of 0.015 in. (thin lines) and 0.030 in.(thick lines). To provide contrasting divisionsbetween elements of the format, thick lines areblocks, and main divisions of blocks, whereas thinlines are required for minor divisions of title andrevision blocks and bill of materials. Use ofmedium line width for letters and numbers isrecommended.The width of lines drawn with a pencilcannot be controlled as well as the width of linesdrawn with pen and ink. However, pencil linesshould be opaque and of uniform width through-out their length. Cutting plane and viewing planelines should be the thickest lines on the drawing.Lines used for outlines and other visible lines3-20
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