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Weight of US Coins

Here is the U.S. Mint web page on coin specifications. Cent through dollar coin weight in grams:

http://www.usmint.gov/about_the_mint/?action=coin_specifications
 

CoinQty (value)Weight in Grams
Cent (1 Cent) (since 1983) - 2.500 g50 ($0.5)130
Nickel (5 Cents) (since 1866) - 5.000 g40 ($2)196
Dime (10 Cents) (since 1965) - 2.268 g50 ($5)114
Quarter (25 Cents) (since 1965) - 5.670 g40 ($10)226
Half Dollar (since 1971) - 11.340 g  
Golden Dollar Coin (since 2000) - 8.1 g