Rack Mount Sizes

42u server racks are the most common rack height sold for data centers.

Rack mount sizes. Enclosures are available in 1u 2u 3u 4u 5u and 6u sizes. The final element to consider when looking at server rack sizes is the rack type. This type of gear is far less common and as you might expect half the width of standard rackmount gear. Hole spacing is either on 1 inch 25 mm centers western electric standard or the same as for 19 inch 482 6 mm racks 0 625 in or 15 9 mm spacing.

A 2 post rack is constructed from two vertical upright support beams while a 4 post rack is constructed from four beams. What about different rackmount sizes. The size denotes the width of the faceplate for the installed equipment. The picture courtesy of dell inc shows some of the dell poweredge servers and examples of different rackmount units.

It is most frequently used as a measurement of the overall height of 19 inch and 23 inch rack frames as well as the height of equipment that mounts in these frames whereby the height of the frame or equipment is expressed as multiples of rack units for example a typical full size rack cage is 42u. 2 post racks and 4 post racks have an inherent difference in depth. Rack servers and other hardware designed to be rack mounted are manufactured in multiples of 1 75 inches and specified in multiples of rack units usually 1u 2u 3u or 4u. The rack unit is a measure of vertical spacing and is common to both the 19 and 23 inch racks.

Please note that actual internal and external height vary depending on rack manufacturer. The size of rackmount gear is very standardized. Racks are designed to hold equipment of those sizes. When it comes to width virtually all rack gear is designed to fit into a standard 19 inch rack.

A rack unit abbreviated u or ru is a unit of measure defined as 1 3 4 inches 44 45 mm. 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. Rack size is a measure in electronic industries alliance eia standard rack units rack u and a single u is equivalent to 1 75in. Comprehensive range of modern and stylish rack mount enclosures which conform to din 41494 and iec 291 1 standards.

They are manufactured from aluminum components designed to allow easy assembly of the electronics.