Nexxt Solutions KB Articles
What is "U" on my Rack Unit?
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A "U" or Rack Unit is a measurement of the height of a piece of computer or network gear that is designed to fit into a standard 19" or 23" rack. A single rack unit is exactly 1.75" (44.45 mm) in height.
When a piece of equipment is designed to be larger than a single rack unit (1U), it will be referred to as multiple of rack units and written such as 2U, or 6U. For this example, will mean a server of 6U is 10.5" or 266.7 mm in height.
Horizontal spacing of a rack units depend on whether the holes are drilled and tapped in the rack, versus the use of cage nuts.
Vertical spacing of rack units is defined by EIA-310 as 18 5/16" or 465.1 mm.
Note: Please, make sure to read the specs' information of the product.