ASME Y14.2:2008 pdf free download.Line Conventions and Lettering.
4 LETTERING
For clarity within this Standard, lettering means both letters and numera Ls I’aragraphs 4.1 through 4.6 identify the type and style of lettering for use on drawings.
4.1 Lettering Type
Lettering should be single stroke gothic, opaque, and well spaced characters as shown in Figs. 13 and 14. When additions or revisions are made to a drawing, the original style of lettering shall he maintained.
4.2 Letter Style
Lither inclined or vertical lettering is permissible. Only one style of lettering shall be used throughout a drawing. The preferred slopc for the inclined characters is approximately 68 deg from the horizontal (see Fig. 13).
4.3 Letters — Upper and Lower Case
Upper case letters shall be used for all lettering on drawings unless lower case letters are required (see Figs. 13 and 141.
4.4 Letter Height
The minimum letter heights for various size drawings are shown in Tables I and I-I.
4.5 Letter Spacing
letters in words should be spaced so the background areas between the letters are approximately equal, and words are clearly separated. 11w space between two numerals having a decimal point between them is to be a minimum of two-third,. the height of the lettering. The vertical space between lines of lettering shall be no more than the height of the lettering. or no less than half the height of the lettering.
4.6 Legibility
The lettering heights, spacing, and proportions in Figs. 13 and 14, and also Table I, normally provide acceptable reproduction. When applying lettering manuall or by typewriter, or CAL) equipment which utilizes heights, spacing, or proportions other than those recommended. the lettering is acceptable when the minimum legibility and reproduction requirements of the accepted industry or military reproduction specifications are mel Therefore, the basic requirement for lettering on a drawing is to produce fully legible copies.
ASME Y14.2:2008 pdf free download
