technical pens

Today most pens are manufactured in the ISO sizes given in the last row of the table. Plotters use the same sizes, but usually only to 0.7 millimeters.

In addition to the point size, actual line widths depend on the nature of the paper or film surface, the ink, and the speed of the pen.

Approximately Equivalent Pen Standards
North American 6/0 4/0 3/0 00 0 1 2 2.5 3 3.5 4 5 6 7
line width (inches) 0.005 0.007 0.010 0.012 0.014 0.020 0.024 0.028 0.031 0.039 0.047 0.050 0.055 0.079
line width (mm) 0.13 0.18 0.25 0.30 0.35 0.50 0.60 0.70 0.80 1.0 1.2 1.3 1.40 2.00
                             
European (mm) 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0 1.2 1.4 2.0
ISO 0.13 0.18 0.25 0.35 0.50 0.70 1.0 1.4 2.0
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