Blueprint Standards 7
the ANSI, the American Society of Mechanical Engineers (ASME) has standardized drawing-sheet sizes
that are designated by letter and published in MIL-STD-100A. ASME also published the ASME Y14.5M-
1994 Dimensioning and Tolerancing standard. Other standard-setting organizations include the Ameri-
can Institute of Architects (AIA), the Canadian Standards Association (CSA), the American Welding So-
ciety (AWS), and others. Moreover, some large firms have adopted their own standards to suit their
individual needs. In the final analysis, the drawing-sheet sizes you use are determined by the needs of
your employer or client and your need to economically lay out required information.
Figure 1.4 Diagram showing ISO (International Standards Organization) metric sheet sizes.