page_title: 19-inch rack
section_title: 23-inch rack
hierarchical_section_title: 19-inch rack / Related standards / 23-inch rack
caption_attribution_description: English: Manchester Baby replica (aka SSEM) at the Museum of Science and Industry, closer shot showing the CRT.
context_page_description: A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is 19 inches wide. 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. Common uses include computer servers, telecommunications equipment and networking hardware, and audiovisual production and scientific equipment.
context_section_description: A 23-inch (580 mm) rack is used for housing telephone (primarily), computer, audio, and other equipment though is less common than the 19-inch rack. The size denotes the width of the faceplate for the installed equipment. The rack unit is a measure of vertical spacing and is common to both the 19 and 23 inch racks.
  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).
caption: The 1948 original Manchester Baby and the 1998 working replica (pictured) were mounted on 23-inch racking.[22]
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