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Physics is also important. Coins are usually made of softer metal so a wrench can crush it if a bolt is too tight.
I don't know... I've tried to drill holes in quarters when I couldn't find a washer. Canadian quarters are as hard as woodpecker lips.
"Woodpecker lips" that is probably the most cursed way to refer to a beak that I've ever seen
You won't like this then.
Since 2000, they've used all-American steel vs. our quarters, which are copper at the core. PS: I don't really know if the Canadian quarter's steel is all-American, I just like the ambiguity of the statement.
This link says "94% steel, 3.8% copper, 2.2% nickel plating" which is equivalent to 2 Standard Woodpecker Lips
Thank you. That's what I was thinking.