Reference for diameter and thickness of US coins

Discussion in 'US Coins Forum' started by keemao, Aug 14, 2015.

  1. keemao

    keemao Well-Known Member

    Looking for either a book or online reference for a friend in another country that will have both diameter and thickness of all US coins. All help appreciated.
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  3. paddyman98

    paddyman98 I'm a professional expert in specializing! Supporter

  4. paddyman98

    paddyman98 I'm a professional expert in specializing! Supporter

    Nice Charts for Diameter again -
    Capture.JPG uscoinsizecomparison.jpg
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  5. paddyman98

    paddyman98 I'm a professional expert in specializing! Supporter

    Thickness info -
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  6. doug5353

    doug5353 Well-Known Member

    Guess we'll have to flip a coin--

    The two references cited above are significantly different;
    Penny, 18.8 vs. 19 mm
    Nickel, 20.9 vs. 21.2 mm
    Dime, 17.7 vs. 17.9 mm
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  7. paddyman98

    paddyman98 I'm a professional expert in specializing! Supporter

    Ha I didn't notice that! We can use my avatar to flip and decide! ;)
  8. kanga

    kanga 65 Year Collector Supporter

    Where is the thickness of a coin measured?
  9. Conder101

    Conder101 Numismatist

    I think you will find that the data on the thickness table Paddyman posted is probably data for the PLANCHET not the finished coin.

    Thickness for a struck coin is somewhat meaningless because it will vary at every point on the coin, and it is also a function of the strength of the strike and how well the planchet was annealed. You MIGHT be able to specify a MAXIMUM thickness from measuring the rim to rim thickness of a modern proof. You could probably calculate a MINIMUM thickness using a minimum weight planchet, the spec diameter and the specific gravity of the alloy.

    The SG and weight tells you the volume, from the diameter you can calculate the area of the face, From the volume and and area you can calculate what the thickness would have to be to give you that volume. That gives you the thickness of the blank. (I am assuming the blank has the same diameter as the finished coin, when the edge if the blank is upset the diameter of the planchet is reduced so it is less than the diameter of the blank/coin.)
  10. d.t.menace

    d.t.menace Member

    Diameter and weight are the most accurate specs to use for US coins, at least for coins struck with a collar. As Conder said strike pressure will have an effect on thickness. Also verticle die misalignment will cause variations in thickness.
    The best reference for weight and diameter is the Redbook.
  11. kanga

    kanga 65 Year Collector Supporter

    Diameter: From your comments pretty much as I thought.
  12. Conder101

    Conder101 Numismatist

    Better reference for specs on US coins is the Coin World Almanac
  13. swamp yankee

    swamp yankee Well-Known Member

    "The Red Book" is the standard reference we all use for usa coins info......
  14. Conder101

    Conder101 Numismatist

    But you won't find tolerance information in the Redbook.
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