The Composition of Modern U.S. Coins 1965 – –

Coin Composition Diameter Weight
Cent (to 1982) .950 copper .050 tin and zinc 19 mm 3.11 grams
Cent (1982 to date) .992 zinc .008 copper 19 mm 2.5 grams
5 cents (Nickel) .750 copper .250 nickel 21.2 mm 5 grams
10 cents (Dime) clad coinage: .750 copper and .250 nickel bonded to an inner core of pure copper 17.9 mm 2.27 grams
25 cents (Quarter) clad coinage: .750 copper and .250 nickel bonded to an inner core of pure copper 24.3 mm 5.67 grams
50 cents (half dollar) clad coinage: .750 copper and .250 nickel bonded to an inner core of pure copper 30.6 mm 11.34 grams
SBA $1.00 clad coinage: .750 copper and .250 nickel bonded to an inner coire of pure copper 26.5 mm 8.1 grams
Sacagawea $1.00 .885 copper .06 zinc . .035 manganese .02 nickel 26.5 mm 8.1 grams

United States Clad Coinage after 1965 
U.S. Silver Coins – When they ended and what they’re worth

coindoc
U.S. Silver Coins: When They Ended and What They're WorthComposition of Pre-1965 Modern U.S. Coinage
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5 years ago Coins in General0