Rack Mount

A 19-inch rack is a standardized (EIA 310-D, IEC 60297 and DIN 41494 SC48D) system for mounting various electronic modules in a "stack", or rack, 19 inches (482.6 mm) wide. more...

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Equipment designed to be placed in a rack is typically described as rack-mount, a rack mounted system, a rack mount chassis, subrack, or occasionally, simply shelf. The slang expression for a subrack (generally 1U height) is "pizza box" due to the similarity in size and shape.

Because of their origin as mounting systems for railroad signaling relays, they are still sometimes called relay racks, but the 19-inch rack format has remained a constant while the technology that is mounted within it has changed to completely different fields. This standard rack arrangement is widely used throughout the telecommunication, computing, and entertainment industries, as well as others.

Specifications

The rack's mounting fixture consists of two parallel metal strips (also referred to as "rails" or "panel mount") standing vertically. The strips are each 0.625 inches (15.875 mm) wide, and are separated by a gap of 17.75 inches (450.85 mm), giving an overall rack width of 19 inches (482.6 mm). The strips have holes in them at regular intervals, with both strips matching, so that each hole is part of a horizontal pair with a center-to-center distance of 18.3 inches (464.82 mm).

The holes in the strips are arranged vertically in repeating sets of three, with center-to-center separations of 0.5 inch (12.7 mm), 0.625 inch (15.875 mm), 0.625 inch (15.875 mm). The hole pattern thus repeats every 1.75 inches (44.45 mm). Racks are divided into regions, 1.75 inches in height, within which there are three complete hole pairs in a vertically symmetric pattern, the holes being centered 0.25 inch (6.35 mm), 0.875 inch (22.225 mm), and 1.5 inch (38.1 mm) from the top or bottom of the region. Such a region is commonly known as a "U", for "unit", and heights within racks are measured by this unit. Rack-mountable equipment is usually designed to occupy some integral number of U. For example, an oscilloscope might be 4U high, and rack-mountable computers are most often 2U or 1U high.

Equipment mounting

Originally the mounting holes were tapped to receive a particular type of threaded bolt. Racks with plain square holes are now common. Square-holed racks allow boltless mounting, and can be adapted for use with bolts by the use of cage nuts. A cage nut consists of a spring steel cage, designed to clip onto a square mounting hole, within which is a captive nut.

Rack-mountable equipment is mounted simply by bolting its front panel to the rack, or with a square-holed rack by clipping or some other variation on the theme. Having all the structural support at one edge of the equipment is a weakness of this system, and so heavier equipment is designed to use a second pair of mounting strips located at the back of the equipment. Various spacings between the front and back strips are used; 31.5 inches (800 mm) is typical, and equipment is often designed to handle a range of rack depths.

Read more at Wikipedia.org