How Thick Is A Dime

Is a clad Roosevelt dime the same thickness as a Mercury dime?
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I'm pretty sure the dimensions of the planchet didn't change...but I could be wrong.
Since the silver mercury and the silver roosevelt were the same diameter and weight, they would take to have been the same thickness. In 65 the size and thickness remained the same, but since the clad composition has a lower specific gravity, the weight is lower.
Well, the thickness of a clad dime is more variable than an old
argent dime. Weight is determined by the thickness (and compo-
sition) of the strip from which the planchet is punched. This
thickness has not changed for dimes since the 1850's if mem-
ory serves. (it decreased one% for quarters in 1999).
Thickness of a coin is determined primarily by blueprint and strik-
ing characteristics but also by planchet thickness and upset-
ting characteristics. Clad dimes can be very thin where they
are struck with low designs and lightly upset. (rolled between
two rollers to reduce diameter of planchet) Such coins tend
to have depression rims like the 1999 problems. Other dates can exist much
thicker. Proof dimes can exist 10% thicker on boilerplate than BU
examples.

Fifty-fifty within the aforementioned date there can be substantial variation.
By and large poor strikes mean thinner coins simply fifty-fifty this isn't a
given I believe.

Near modern coins have significant changes from year to year
and some of these changes do event in thickness variability.
Clads aren't fabricated to as exacting standards as pre-1950 coins
and this increases variability also. Quality has been improv-
ing in the past decade and much of this has been at the expense
of relief (which also affects thickness).
It varies on the same coin. I just checked a 2008-P and the rim thickness went upward to 1.42 mm at the acme to 1.20 mm at the bottom.
It will vary slightly (<>10%) but be near the same
It will vary slightly (<>?10%) simply exist about the same.