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@TorontoBuilder answered your question. But I have a question about your question. What is a 4C adapter? I suspect a typo or a name for something I call by a different name. Can you post a photo?

5C is a common collet style often used on lathes. You can buy 5C chucks from many sources.
Sorry for the delay. Not sure if these were standard issue.
It is MT4 taper on the outside, with chamfer on the inside to fit 4C.
Its pulled into the adapter with a drawbar.

IMG_1218.jpeg
 
Sorry for the delay. Not sure if these were standard issue.
It is MT4 taper on the outside, with chamfer on the inside to fit 4C.
Its pulled into the adapter with a drawbar.

View attachment 56303
my understanding is that there are old lathes that have sleeves for a slew of different collets sizes.

One day I am going to make a sleeve for my chippie to see just how little run out I can get for 5C collets, if I ever need less than I can get with my 5C chuck.
 
One day I am going to make a sleeve for my chippie to see just how little run out I can get for 5C collets, if I ever need less than I can get with my 5C chuck.

Mine is simply amazing. I've never needed or wanted better.

In some respects, it's even better than a 4 jaw because the distortion is so minimal.
 
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