Editing ISO 216 (section)

==Matching technical pen widths==
[[File:Rotring Rapidograph Technical Pens 0.1–2.0 mm.svg|thumb|upright|Rotring Rapidographs in ISO nib sizes]]
An adjunct to the ISO paper sizes, particularly the A series, are the technical drawing line widths specified in [[ISO 128]]. For example, line type A ("Continuous - thick", used for "visible outlines") has a standard thickness of 0.7&nbsp;mm on an A0-sized sheet, 0.5&nbsp;mm on an A1 sheet, and 0.35&nbsp;mm on A2, A3, or A4.<ref>{{cite web|url=http://www.metrication.com/drafting/lines.html|title=Pen Sizes and Line Types|last1=Bell|first1=Steven|website=Metrication.com|access-date=30 August 2017}}</ref>

The matching [[technical pen]] widths are 0.13, 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.40, and 2.0&nbsp;mm, as specified in [[ISO 9175-1]]. Colour codes are assigned to each size to facilitate easy recognition by the drafter. Like the paper sizes, these pen widths increase by a factor of {{math|{{sqrt|2}}}}, so that particular pens can be used on particular sizes of paper, and then the next smaller or larger size can be used to continue the drawing after it has been reduced or enlarged, respectively.<ref name=":0">{{cite web|url=https://www.cl.cam.ac.uk/~mgk25/iso-paper.html|title=International standard paper sizes|last1=Kuhn|first1=Markus|access-date=30 August 2017}}</ref><ref>{{cite web|url=https://www.designingbuildings.co.uk/wiki/Technical_drawing_pen_sizes|title=Technical drawing pen sizes|website=Designing Buildings Wiki|access-date=30 August 2017}}</ref>

:{| class="wikitable"
|-
!style="text-align:left"| Linewidth (mm)
|width="9%" colspan=2| 0.10
|width="9%" colspan=2| 0.13
|width="9%" colspan=2| 0.18
|width="9%" colspan=2| 0.25
|width="9%" colspan=2| 0.35
|width="9%" colspan=2| 0.50
|width="9%" colspan=2| 0.70
|width="9%" colspan=2| 1.0
|width="9%" colspan=2| 1.4
|width="9%" colspan=2| 2.0
|-
!style="text-align:left"| Colour
|width="2%" style="background:brown"| ||Maroon
|width="2%" style="background:darkmagenta"| ||Violet
|width="2%" style="background:crimson"| ||Red
|width="2%" style="background:white"| ||White
|width="2%" style="background:gold"| ||Yellow
|width="2%" style="background:saddlebrown"| ||Brown
|width="2%" style="background:steelblue"| ||Blue
|width="2%" style="background:chocolate"| ||Orange
|width="2%" style="background:lightseagreen"| ||Green
|width="2%" style="background:silver"| ||Gray
|}

[[File:Micronorm.svg|thumb|upright=.5|Micronorm logo]] The earlier [[DIN 6775]] standard upon which ISO 9175-1 is based also specified a term and symbol for easy identification of pens and drawing templates compatible with the standard, called ''Micronorm'', which may still be found on some technical drafting equipment.