Technical Lettering - Dimensions of Letters

Dimensions of Letters

  • The Nominal Size of lettering is defined by the height (h) of the outline contour of the upper-case (capital).
  • Central Line is the imaginary line in the middle of each line or line element which is a constitutive part of a graphic character set.
  • If we consider d as the width of the line element and h as the height of the line element, then the two standard ratios for d/h are: 1/14 and 1/10, which are feasible because they result in a minimum number of line thicknesses.
  • Location of Central Lines- The nominal size (h) and the spacing between characters (a) shall be taken as the basis for defining the central line.
  • Range of Nominal Sizes -The range of nominal sizes are 2.5 mm ;3.5mm ; 5 mm; 7 mm; 10 mm; 14 mm; 20 mm;

The multiple of 1.414(square root of 2) is the range of heights for lettering is derived from the standardized progression of dimensions for paper sizes.

  • Lettering Angle-The lettering may be vertical (upright) or inclined (sloped) to the right at 75° from the horizontal.
  • The spacing between two characters may be reduced by half, if this gives a better visual effect.
  • various letters are divided into no. of parts so that dimensions will be accurate.
  • The size of letter is described by its height. According to the height of letters, they are classified as :
  1. Lettering A
  2. Lettering B

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