1u Rack Dimensions

Rack units for equipment is considered maximum dimensions. 19 rack equipment dimensional data as specified by bs5954 1980 and iec 297 1975. When leasing space in a colocation facility or planning for an on site network cabinet or closet customers should focus on four key issues.

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To be precise 1u equals 1 75 inches 44 45mm of rack height.

1u rack dimensions. 19 rack equipment dimensional data. Single and double gang electrical plate dimensions. Although it is called a 19 inch rack unit the actual mounting dimensions of a 19 inch rack unit are 18 5 16 inches 18 3125 in or 465 1 mm wide center to center. In addition to your dimension requirements please also take into consideration the rack s cooling capabilities and cooling options compatibility load capacity cable management options rack accessories rail mounting and overall rack expandability.

A single rack unit is exactly 1 75 44 45 mm in height although many manufacturers will make their equipment slightly smaller than this to ease installation into racks where things were not spaced as accurately as they should be. For electronic equipment racks e g 19 or 23 inches wide the term 1u is used to define one rack unit of height. A 19 inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. 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.

Each module has a front panel that is 19 inches 482 6 mm wide. In practice devices are often made slightly smaller than the specified u value to allow a little space. The 1u 2u 3u 4u 5u 6u and 7u are all different sized rackmount servers and the u following the number is short for unit the number indicates the size of the rackmount 1u being the smallest rackmount and 7u being the biggest rackmount. Many rack mounted power systems and power supplies are specified as being 1u 2u 3u etc.

A device specified as 2u for example may in reality measure 3 44 inches in height rather than the 3 5 inch multiple of 1 75. What does this mean. The rack unit is a standard measurement for server height. One rack unit u is 1 75 inches.

Even comparing racks with similar dimensions can be like comparing apples to oranges. The picture courtesy of dell inc shows some of the dell poweredge servers and examples of different rackmount units. The 19 inch dimension includes the edges or ears that protrude from each side of the equipment allowing the module to be fastened to the rack frame with screws. The 19 inch rack article gives credit to at t for setting the height for 1u at 1 75 inches.