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  2. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    American wire gauge. American Wire Gauge ( AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [1] The cross-sectional area of each gauge is an important ...

  3. Italian units of measurement - Wikipedia

    en.wikipedia.org/wiki/Italian_units_of_measurement

    1 braccio = 12 once = 594.94 mm 1 trabucco = 6 piedi 1 miglio = 3000 braccii = 1784.81 m . 1 atomo € = 1 mm 1 dito € = 1 cm 1 palmo € = 1 dm 1 metro € = 1 m . Venice. 1 linea = 10 decimi 1 piede = 348 mm 1 piede = 12 once = 347.735 mm 1 piè = 13.69 in 1 braccio = 683 mm

  4. Rack unit - Wikipedia

    en.wikipedia.org/wiki/Rack_unit

    Rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 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 as multiples of ...

  5. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    The R-value is a measure of an insulation sample's ability to reduce the rate of heat flow under specified test conditions. The primary mode of heat transfer impeded by insulation is conduction, but insulation also reduces heat loss by all three heat transfer modes: conduction, convection, and radiation.

  6. Pyramid inch - Wikipedia

    en.wikipedia.org/wiki/Pyramid_inch

    This was the origin of the "pyramid inch". Taylor regarded the "pyramid inch" to be 1/25 of the "sacred cubit ", ancient unit based on the forearm length from the tip of the middle finger to the bottom of the elbow, whose existence had earlier been postulated by Isaac Newton. [4] The principal argument was that the total length of the four ...

  7. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The Unified Thread Standard ( UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries. It has the same 60° profile as the ...

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