TABLE OF CONTENTS Several American National Standards for use in preparing engineering drawings and related documents are referred to for use.
Recommended trimmed sheet sizes, based on ANSI Y14.1-1980 (R1987), are shown in the following table.
| Size, inches | Metric Size, mm | ||||||
|---|---|---|---|---|---|---|---|
| A | 8 11 | D | 22 34 | A0 | 841 1189 | A3 | 297 420 |
| B | 11 l7 | E | 34 44 | A1 | 594 841 | A4 | 210 297 |
| C | 17 22 | F | 28 40 | A2 | 420 594 |
The standard sizes shown by the left-hand section of the table are based on the dimensions of the commercial letter head, 8 11 inches, in general use in the United States. The use of the basic sheet size 8 11 inches and its multiples permits filing of small tracings and folded blueprints in commercial standard letter files with or without correspondence. These sheet sizes also cut without unnecessary waste from the present 36-inch rolls of paper and cloth.
For drawings made in the metric system of units or for foreign correspondence, it is recommended that the metric standard trimmed sheet sizes be used. (Right-hand section of table.) These sizes are based on the width-to-length ratio of 1 to 
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American National Standard Y14.2M-1979 (R1987) establishes line and lettering practices for engineering drawings. The line conventions and the symbols for section lining are as shown...
