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US coins: Cent - 19.05 mm Nickel - 21.2 mm Dime - 17.9 mm Quarter - 24.3 mm Half - 30.1 mm Dollar (modern) - 26.5 mm
The actual thickness of a dime is between 1.35 and 1.40 mm.
A US dime has a diameter of 17.91 MM, a thickness of 1.35 MM, and a mass of 2.268 grams.
The US nickel has been 21.2 mm in diameter ever since 1883.
Diameter: 21.21 mm (0.825 in)Thickness: 1.95 mm (0.077 in)