Definição

• Tolerance.  Allowable deviation from some set standard of weight, size, composition, fineness or color. Coinage has historically had a tolerance established for each country's or ruler's issues. Coinage laws, monetary laws or the nation's codes usually spell out the tolerance for coins of that country.
  Coins in precious metals – gold and silver – always had close tolerances of weight. Overweight or underweight coins would not be acceptable, but overweight blanks could be reduced in weight, by adjusting, to as close a tolerance as legally possible. The Trial of the Pyx in Great Britain (since 1279) and the Assay Commission in America (from 1792 to 1978) were citizens' committees to attest the weight, fineness and tolerance of the nation's coinage.
                United States Coin Denominations            
                                                           
                                                  Legal             Tolerence       
      Denomination         Weight      Weight     Percentage
                                       Grains      Grains       Percent.
                                                          
    Double Eagle. . . . . .    516         0.50         0.09  
    Eagle . . . . . . . . .          258           .50           .19  
    Half Eagle. . . . . . .       129           .25           .19  
    Quarter Eagle . . . . .      64.5         .25           .38  
                                                        
    Silver Dollar . . . . .      412.5       1.50          .36  
    Half Dollar . . . . . .      192.9       1.50           .77  
    Quarter Dollar. . . . .      96.45     1.50         1.55  
    Dime. . . . . . . . . .          38.58      1.50         3.88  
    Five Cent . . . . . . .        77.16      3.0           3.88  
    One Cent. . . . . . . .         48.0       2.0          4.16  
  With the rise of the vending machine industry, and increasing use of coins in various detectors, tolerance of size – diameter and thickness – became important. But the decreased use of precious metals in coins have lessened the importance of metallic tolerance.
  Currently in America tolerance is specified for the thickness of clad coinage strip. It cannot deviate more than .0015-inch (.038mm) from the specified thickness necessary for that of dime, quarter or half dollar strip.  See clad, cladding.
  The original concept was called weight-average for coins in Great Britain, particularly by numismatists. Today the concept of tolerance is called remedy in Great Britain.
  Reference:                                                                                                                              
  NC5 {1964} Peck, p xii.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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