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A US nickel has a diameter of 21.21mm and a thickness of 1.95mm
A US nickel coin has a diameter of 2.121 cm and its thickness is 0.195 cm
Diameter: 21.21 mm (0.825 in)Thickness: 1.95 mm (0.077 in)
Diameter: 21.2 mm Thickness: 1.95 mm Weight: 5.00 gm
A nickel has a width/diameter of 21.21mm (2.121cm) and a thickness of 1.95mm (0.195cm).