wrote in message
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I'm looking at a Regal-Beloit end mill, 3/4" dia. M-7

It is described as Cobalt but, when I try a search, it shows it to be
HSS.

Which is correct?

TIA

Lewis.

*****

FWIW, all "cobalt" tools are actually classed as high speed steel. M42 is
the most common of the "cobalt" high speed steel grades, with 8% cobalt.
You'll also see M35 (5% cobalt), and many of the high-end proprietary grades
contain various amounts of cobalt.

M7 is a tough HSS with good overall properties, often chosen for use in
portable industrial drills because it will tolerate some off-axis loads and
rough handling. It contains no cobalt.

--
Ed Huntress