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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 ...
Typically for rack-mounted devices, the width of the front panel exceeds the width of the device itself, which provides the overlap zone (including screw holes) with the left and right rack rails. Nineteen-inch racks are also often used to house professional audio and video equipment, including amplifiers , effects units , interfaces, headphone ...
Rack Rail comes in two different commonly used forms. Tapped/threaded rack rail has round holes tapped for 10-32 UNF or 10-24 UNC screws. The other common form of rack rail is square hole rack strip which has square holes for captive nuts, available tapped for various different screw threads, that are clipped into the holes as needed to mount equipment.
Mobile aisle shelving is typically used for academic or commercial applications where a significant volume of physical archive material, filing or books is to be stored. These include medical or government records, file-intensive offices such as the legal or accountancy professions, and public and academic libraries and similar archives.
Horizontal pitch (HP) is a unit of length defined by the Eurocard printed circuit board standard used to measure the horizontal width of rack mounted electronic equipment, similar to the rack unit (U) used to measure vertical heights of rack mounted equipment.
The width of devices that are mounted on a 35 mm "top hat" DIN rail generally use "modules" as a width unit, one module being 18 mm wide. For example, a small device (e.g. a circuit breaker) may have a width of 1 module (18 mm wide), while a larger device may have a width of 4 modules (4 × 18 mm = 72 mm).
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Overhead storage can refer to shelves, cabinets, hooks, lift tables [1] or track systems [2] mounted at height (either ceiling-hung or wall-hung), and can be a form of area-saving storage by moving storage up from the floor and utilizing the volume at height.