page_title: 19-inch rack
section_title: ETSI rack
hierarchical_section_title: 19-inch rack / Related standards / ETSI rack
caption_attribution_description: English: drawing showing the different dimensions of ETSI and 19 inch racks Deutsch: Zeichnung, die die verschiedenen Dimensionen der Racks zeigt.
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: The ETSI rack is defined by the European Telecommunications Standards Institute (ETS 300 119). The distance of the right edge of the right mounting rail to the left edge of the left mounting rail is 535 millimetres (21.1 in). As 535 mm is very close to 21 inches, these racks are sometimes called 21-inch racks. The gap between the posts is 500 millimetres (19.69 in). As 19-inch equipment has a maximum width of 17 ¹⁄₄ inches (438.15 mm), they can easily be mounted in an ETSI rack by means of an ETSI bracket or adapter plate.
  In contrast to the "19-inch world", ETSI also defined the size of the rack enclosure: the four allowed widths are 150, 300, 600, 900 millimetres (5.9, 11.8, 23.6, 35.4 in) and two allowed depths are 300 and 600 millimetres (12 and 24 in). Hole spacing is 25 millimetres (0.98 in).
caption: racks: 19" and ETSI
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