Rees11 (talk) 12:57, 23 December 2009 (UTC), I support this statement whole-heartedly. This area is absolutely critical for proper mounting of Intel slide rails. What is important to note on this drawing is the 16.77mm minimum clearance between the two edges of the mounting flange. Installation and removal of hardware in a square hole rack is very easy and boltless, where the weight of the equipment and small retention clips are all that is necessary to hold the equipment in place. I would like to note that there are almost certainly as many or more amp racks (audio equipment racks) as there are computer racks, so the article should serve both equally. Large server rooms will often group rack cabinets together so that racks on both sides of an aisle are either front-facing or rear-facing, which simplifies cooling by supplying cool air to the front of the racks and collecting hot air from the rear of the racks. I agree with him - this statement is IMHO not only dubious but factually incorrect. Racks carrying telecom equipment like routers and switches often have extra width to accommodate the many cables on the sides. A series of studies led to the adoption of frames 7 feet (2.1 m) high, with modular widths in multiples of 1 foot 1 inch (0.33 m)—most often 2 feet 2 inches (0.66 m) wide.[21]. 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. Similarly are we suggesting that the mobile DJ who brings a 6U portable rack enclosure is breaking any rules because his equipment is not secured in any manner? The key specs are: The tubing size of the uprights, typically one of: 2″x2″, 2″x3″, or 3″x3″. That's correct, gap from the inside edge of the rails is 17.75 inches (your computer or other equipment must be narrower than this), centerline to centerline, the holes are 18.25 inches apart, and width of the front plate for your equipment can be up to 19 inches. The three most common sizes of rack screws found in rack mounted equipment are: 1. I think "equipment rack" is rather more accurate, and is already a redirect to this page. I have a rack here that is not only not anchored but actually on castors: it was supplied like that by the vendor. Occasionally, as in the case of the US DoD's WIN-T program's equipment, even the portable racks carry a tipping hazard and must be stacked in a particular order to reduce the risk.dunerat (talk) 09:19, 19 October 2010 (UTC), each hole is part of a horizontal pair with a center-to-center distance of 18.3 inches (464.82 mm), My guess is that the original (pre-metric) spec was 18-5/16" = 18.3125" ≈ 465.1 mm --Helium4 (talk) 06:28, 20 May 2020 (UTC), A Commons file used on this page has been nominated for speedy deletion, A Commons file used on this page has been nominated for deletion, http://search.giraffe.com/ah/search/lookit.cgi?-v0206.44, http://www.schroff.co.jp/40_03_kikaku/pdf/Standards_Summary_Final_Version_160904.pdf, http://www.discount-low-voltage.com/racaac.html, https://en.wikipedia.org/w/index.php?title=Talk:19-inch_rack&oldid=957718625, Creative Commons Attribution-ShareAlike License. The square hole measures 3/8″ x 3/8″. etc.) A standard 19-inch server rack cabinet is typically 42u in height, 600 millimetres (24 in) wide, and 36 inches (914.40 mm) deep. 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). Would be nice if the article introduction mentioned where the "19 inch" is to be measured. CrispMuncher (talk) 21:51, 30 June 2009 (UTC), I concur. It appears to originate in a false assumption, namely that all racks are ~40U behemoths. —Preceding unsigned comment added by 216.27.136.184 (talk) 09:50, 9 January 2010 (UTC). Although I do not qualify as a professional user, I have purchased a wide variety of racks and rack mount equipment, both new and used, over the last forty-five years and I have never seen a tapped hole 19" rack in the USA that did not have 10-32 UNF threads. APC SX-range racks), it is common for equipment that features 4-post mounting brackets to have an adjustable rear bracket. State-of-the-art rackmount cases are now also constructed of thermo stamped composite, carbon fiber, and DuPont’s Kevlar for demanding military and commercial uses. This page was last edited on 20 May 2020, at 06:28. jhawkinson (talk) 17:37, 31 July 2009 (UTC), I've just seen jhawkinson's comment about anchoring in archives 2. Such a region is commonly known as a U, for unit, RU for rack unit or, in German, HE, for Höheneinheit. This gap allows a bit of room above and below an installed piece of equipment so it may be removed without binding on the adjacent equipment. Computer servers designed for rack-mounting can include a number of extra features to make the server easy to use in the rack: When there is a large number of computers in a single rack, it is impractical for each one to have its own separate keyboard, mouse, and monitor. These cases can be isolated by thick layers of foam or may use spring-loaded shock mounting. Rack-mountable computers and servers are mostly between 1U and 4U high. 19″ Racks; Rack Hole Types A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Frames for holding rotary-dial telephone equipment were generally 11 feet 6 inches (3.51 m) high. 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). To protect equipment from shock and vibration road rack cases use an inner and outer case. Thyl Engelhardt213.70.217.172 (talk) 13:52, 20 June 2011 (UTC), What about 10 inch rack, or 12 inch rack?. A key structural weakness of front-mounted support is the bending stress placed on the mounting brackets of the equipment, and the rack itself. The holes are large enough to permit a bolt to be freely inserted through without binding, and bolts are fastened in place using cage nuts. The amount of motion and resulting stress depends on the structural characteristics of the building and framework in which the equipment is contained, and the severity of the earthquake. Non-isolated cases simply mount 19-inch mounting posts inside the case. The shape of small cases is maintained by the rack rails and the cover seal extrusions alone. The 19-inch (482.6 mm) standard rack arrangement is widely used throughout the telecommunication, computing, audio, video, entertainment and other industries, though the Western Electric 23-inch standard, with holes on 1-inch (25.4 mm) centers, is still used in legacy ILEC/CLEC facilities. Production of clearance-hole racks is less expensive because tapping the holes is eliminated and replaced with fewer, less expensive, cage nuts. In recent years, data centers have standardized on server cabinets (enclosed racks with mounting rails front and rear) with 3/8" square holes, rather than the pre-tapped holes of the past. Most racks these days are made with square holes. Open Rack is a mounting system designed by Facebook's Open Compute Project that has the same outside dimensions as typical 19-inch racks (e.g. . Dell rail kits are designed to be installed in Dell rack enclosures, which have square mounting holes for tool-less installation, and are also compatible with racks from other vendors, including square-hole, round-hole and threaded-hole racks. Instead, a KVM switch or LOM software is used to share a single keyboard/video/mouse set amongst many different computers.