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2. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   Originally, the mounting holes were tapped with a particular screw thread. When rack rails are too thin to tap, rivet nuts or other threaded inserts can be used, and when the particular class of equipment to be mounted is known in advance, some of the holes can be omitted from the mounting rails.

3. Rack rail - Wikipedia

   en.wikipedia.org/wiki/Rack_rail

   A rack rail, or rack strip, is used to mount rackable electronic hardware and 19-inch rack mount accessories within a 19-inch rack. [1] Within a rack a minimum of two rack rails are required to mount equipment. The height of rack rail is determined by the number of rack units required for mounting the equipment.

4. Patch panel - Wikipedia

   en.wikipedia.org/wiki/Patch_panel

   However, emulating or exceeding the capabilities of audio or video patch panels requires specialized devices like crossbar switches. Switching equipment may be electronic, mechanical, or electro-mechanical. Some switcher hardware can be controlled via computer or other external devices. Some have automated or pre-programmed operational ...

5. Cage nut - Wikipedia

   en.wikipedia.org/wiki/Cage_nut

   A common use for cage nuts is to mount equipment in square-holed 19-inch racks (the most common type), with 0.375 inches (9.5 mm) square-hole size. There are four common sizes: UNF 10–32 and, to a lesser extent, UNC 12–24 are generally used in the United States; elsewhere, M5 (5 mm outside diameter and 0.8 mm pitch) for light and medium equipment and M6 for heavier equipment, such as servers.

6. Effects unit - Wikipedia

   en.wikipedia.org/wiki/Effects_unit

   Rackmount effects units are typically built in a thin metal chassis with rack ears designed to be screw-mounted into the rack rails of a 19-inch rack that is standard to the music technology industry. Rackmount effects have a standardized 19-inch width, and height of 1 or more rack unit(s). Devices that are less than 19 inches wide can ...

7. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] 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 ...