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Default Why is a 1/2" Tap Shank Smalelr than a 3/8" Tap Shank?

Anyone know why this is?

Seems to me that if you are starting with a blank that is large enough to
make the 1/2" tap, you might as well make the shank the same as the 3/8" but
the standard is significantly smaller.

1/2" taps have a 0.367" round and a 0.275" square

3/8" taps have a 0.286" round and a 0.381" square

What am I missing here?

Regards,
Joe Agro, Jr.
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