Hardinge collet angles

Gentlemen
I need to determine the collet angle on 5C and 3C collets.
I have seen the 5C quoted as 20 degrees inclusive and also 20.0334
degrees. Which is correct? Also what is the angle for a 3C?
Is there any reference that discusses a different angle for the collet
and the tapered bore that the collets mounts to?
It has been suggested that the matching tapered bore my be at a
slightly different angle to ensure that the collet is located on the
largest diameter.
Thank you
Richard
Reply to
Richard Edwards
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