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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 or bolts. Common uses include computer servers , telecommunications equipment and networking hardware , audiovisual production gear, professional audio equipment, and scientific equipment .
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.
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.
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 ...
A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
The term fine adjustment screw typically refers to screws with threads from 40–100 TPI (Threads Per Inch) (0.5 mm to 0.2 mm pitch) and ultra fine adjustment screw has been used to refer to 100–254 TPI (0.2 mm to 0.1 mm pitch). These screws are most frequently used in applications where the screw is used to control fine motion of an object.
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