Editing Eurocard (printed circuit board) (section)

== Dimensions ==
As the cards are assumed to be installed in a vertical orientation, the usual meanings of height and width are transposed: A card might be 233.35&nbsp;mm "high", but only 20&nbsp;mm "wide".  Height is measured in [[rack unit]]s, "U", with 1 U being {{convert|1.75|in|mm|2|abbr=on}}.  This dimension refers to the subrack in which the card is to be mounted, rather than the card itself. 

A single card is 100&nbsp;mm high.  Taller cards add a 133.35&nbsp;mm, so that a double height card is 233.35&nbsp;mm high and a triple 366.7&nbsp;mm high.

Enclosure heights are multiples of 3U, with the cards always {{convert|33.35|mm|in|3|abbr=on}} shorter than the enclosure.  Two common heights are 3U (a 100&nbsp;mm card in a {{convert|5.25|in|mm|2|abbr=on}} subrack) and 6U (a 233.35&nbsp;mm card in a {{convert|10.5|in|mm|2|abbr=on}} high subrack).  As two 3U cards are shorter than a 6U card (by 33.35&nbsp;mm), it is possible to install two 3U cards in one slot of a 6U subrack, with a mid-height structure for proper support.

Card widths are specified in [[horizontal pitch]] units "HP", with 1 HP being {{convert|0.20|in|mm|2|abbr=on}}.

Card depths start at {{convert|100|mm|in|3|abbr=on}} and increase in {{convert|60|mm|in|3|adj=on|abbr=on}} increments. The most common today is {{convert|160|mm|in|3|adj=on|abbr=on}}, but standard hardware is available for depths of {{convert|100|mm|in|3|abbr=on}}, {{convert|160|mm|in|3|abbr=on}}, {{convert|220|mm|in|3|abbr=on}}, {{convert|280|mm|in|3|abbr=on}}, {{convert|340|mm|in|3|abbr=on}}, and {{convert|400|mm|in|3|abbr=on}}.

{| class="wikitable"
|+ Valid Eurocard sizes. Dimensions in mm. Connectors on the right.
|-
| style="background-color:green"|
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| style="background-color:green"|
| height="133px" valign="top"| ↑<br />366.7<br />Triple-height<br />(9U) subrack
| rowspan="3"| ↑<br />board<br />height<br />+0/−0.3
|-
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| height="133px" valign="top"| ↑<br />233.35<br />Double-height<br />(6U) subrack
|-
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| style="background-color:green"|
| height="100px" valign="top"| ↑<br />100<br />Single-height<br />(3U) subrack
|-
| width="60px"| ←<br />400
| width="60px"| ←<br />340
| width="60px"| ←<br />280
| width="60px"| ←<br />220
| width="60px"| ←<br />160
| width="100px"| ←<br />100
|-
| colspan="6" align="center"| ← board depth +0/−0.3
|}