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Countersink selection

I'd like to replace a burned up countersink. What angle is most useful for general work? 6-flute cobalt sound good?

Reply to
Spehro Pefhany
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Single hole, baby! 62 deg?

Reply to
Tom Gardner

82 degrees for UN flat heads, 90 degrees for metric. I prefer the Ford type single flute c'sinks for general use.

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Ned Simmons

Reply to
Ned Simmons

What Ned said. 60 degrees is best for running centers.

Reply to
Robert Swinney

Thanks, gentlemen. I ended up getting the hi-alloy HSS M.A. Ford single flute type in each of the 3 angles. Works nicely.

Best regards, Spehro Pefhany

Reply to
Spehro Pefhany

--The only thing I don't like about single flute countersinks is that they are *very* hard to sharpen. Someone sells a jig to sharpen them but it costs more than a lifetime supply of countersinks..

Reply to
steamer

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