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2. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   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 ...

3. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The height of the electronic modules is also standardized as multiples of 1.75 inches (44.45 mm) or one rack unit or U (less commonly RU). The industry-standard rack cabinet is 42U tall; [1] however, many data centers have racks taller than this. [2] The term relay rack appeared first in the world of telephony. [3]

4. Preferred metric sizes - Wikipedia

   en.wikipedia.org/wiki/Preferred_metric_sizes

   A standard metric (concrete) block is 190 mm wide, 390 mm long, and 190 mm high, which allows for 10 mm mortar joints in between bricks, giving a standard unit size of 200 mm square by 400 mm long. [3] A standard metric brick is 90 by 57 by 190 mm; with 10 mm of mortar, that produces a standard unit of 100 mm x 200 mm. [3]

5. 32 mm cabinetmaking system - Wikipedia

   en.wikipedia.org/wiki/32_mm_cabinetmaking_system

   Distance of the holes in the row of holes: 32 mm; Diameter of the holes: 5 mm and 8 mm [clarification needed]. A typical 5 mm shelf stud may measure 15-16 mm long, and has a thin flange of about 7 mm diameter halfway at its length. Distance of the front row of holes to the front edge: 37 mm

6. Drawer - Wikipedia

   en.wikipedia.org/wiki/Drawer

   A white wooden drawer Filing card drawer A drawer ( / d r ɔːr / ⓘ DROR ) is a box -shaped container inside a piece of furniture that can be pulled out horizontally to access its contents. Drawers are built into numerous types of furniture, including cabinets , chests of drawers (bureaus), desks , and the like.

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