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The United States Mint Coin Specifications

The five cent coin (nickel) is 1.95 mm thick.

There are exactly: 2.54 cm/1 inch.

What technique do folks use to keep from burning the carbon off
the thin part of the blade when heat treating and tempering.

Obviously one is to have an oxygen starved furnace.

+1

If you scan this link you will see some bits on
how important the tempering is along with some
hints on how to avoid warping in the tempering
process.

A Woodworker's Guide to Tool...

I am too late but did you consider giving the steel that will
be the cutting edge a good peening before you finish grind it?
Hot or cold forging can improve the grain of the steel.
Visit some...