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  2. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    22 mm 5 g 1875–1878 $5 Half Eagle 21.6 mm 8.36 g 1795–1929 $10 American Gold Eagle 22 mm 7.78 g 1986–present $25 American Platinum Eagle 22 mm 7.78 g 1997–present Half Cent 23.5 mm 6.74 g 1795–1857 Two Cent 23 mm 6.22 g 1864-1873 Quarter (Clad) 24.26 mm 5.67 g 1965–present Quarter (40% Ag) 24.3 mm 5.75 g 1976(S) Quarter 24.3 mm 6.25 ...

  3. Comparative Tracking Index - Wikipedia

    en.wikipedia.org/wiki/Comparative_Tracking_Index

    To measure the tracking, 50 drops of 0.1% ammonium chloride solution are dropped on the material, and the voltage measured for a 3 mm thickness is considered representative of the material performance. Also term PTI (Proof Tracking Index) is used: it means voltage at which during testing on five samples the samples pass the test with no failures.

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  5. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    The thickness of items such as paper, film, foil, wires, paint coatings, latex gloves, plastic sheeting, and fibers For example, most plastic ID cards are about 30 thou (0.76 mm) in thickness. Card stock thickness in the United States, where mils are also called points. [2] Gauge (diameter) of strings in stringed instruments [3] [4]

  6. Libertad (coin) - Wikipedia

    en.wikipedia.org/wiki/Libertad_(coin)

    40 mm (1.58 in) Thickness: 3.0 mm (0.12 in) Edge: Reeded: Composition: 99.9% Ag: Years of minting: 1982-present: Obverse; Design: Coat of arms of Mexico with 10 past versions of this symbol surrounding it. Reverse; Design: Three-quarter side view of the Angel of Independence with the volcanoes Popocatépetl and Iztaccíhuatl in the background

  7. Birmingham gauge - Wikipedia

    en.wikipedia.org/wiki/Birmingham_gauge

    The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm).

  8. List of disk drive form factors - Wikipedia

    en.wikipedia.org/wiki/List_of_disk_drive_form...

    4 in × 1 in × 5 + 3 ⁄ 4 in (102 mm × 25 mm × 146 mm) = 377 cm 3. This smaller form factor is similar to that used in an HDD by Rodime in 1983, which was the same size as the "half height" 3 + 1 ⁄ 2 in (89 mm) FDD, i.e., 1.63 inches (41 mm) high.

  9. Traditional point-size names - Wikipedia

    en.wikipedia.org/wiki/Traditional_point-size_names

    Point Metric size American system Continental system Chinese system American [4] British [1] French [5] German [6] Dutch Character Pinyin Meaning 1 ≈ 0.353 mm: American [a] ...