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In the boxes of tooling that came with the heavy 10L I adopted last summer, there is a number of 5C collets, a hollow drawbar, and not one, but two adapters for the spindle end.
One of them is a simple one, with external taper to match the spindle, and internal taper to fit the 5C series. With the supplied drawbar, I'm quite pleased with the workholding options it opens up for me.
The other adapter, however does not fit my lathe. The internal taper does appear to be 5C, but I cannot measure the external taper easily. Instead of the simple flange on the front of the 'good' adapter, this one has what appears to be an internally threaded cup, as if it has a built-in spindle thread protector. The only problem is that the threads don't fit my spindle.

So this begs the real question to this group: Which SB lathe would have a spindle with a 2-1/4", 12TPI threaded nose?

--
Rick Green

I can't answer your thread question , but there should be one
of those threaded spindle protectors that goes on before you slip the
collet adapter in . It's so you can remove the adapter without having to
use a punch though the spindle?? to remove it & risk damaging the collet
threads .

??? If you have one that fits your lathe please disregard this message .

??? ??? animal

On Mon, 13 Feb 2023, mike allen wrote:

??? ??? I can't answer your thread question , but there should be one
of those threaded spindle protectors that goes on before you slip the
collet adapter in . It's so you can remove the adapter without having to
use a punch though the spindle?? to remove it & risk damaging the collet
threads .

??? If you have one that fits your lathe please disregard this message .

No I don't. I was planning on making one out of some HDPE I have on hand.
I'll have to go out and check my collet adapter this afternoon. I don't remember there being any clearance between the spindle nose and the 'lip' of the collet adapter. That would be required in order for the thread protedtor to also serve as an extractor tool.
That's a great idea, though. I'll re-think my design for a thread protector accordingly.

The piece mentioned in my first post appears to be unitary. I'll examine it more closely to see if maybe it's really two parts badly wedged together...

--
Rick Green