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Spindle thread ?

AeroTD&G

Plastic
Joined
May 20, 2017
I know the spindle thread on my SB is 2 1/4-8. I have a few odd back plates in my extras bin. Two scale to be 2 1/4-6 and the other 1 1/2-8. I found the 1 1/2-8 could fit an Atlas or Logan lathe. I found nothing on the ones that seem to be 2 1/4-6, can anyone tell me what these might fit?
 
I know the spindle thread on my SB is 2 1/4-8. I have a few odd back plates in my extras bin. Two scale to be 2 1/4-6 and the other 1 1/2-8. I found the 1 1/2-8 could fit an Atlas or Logan lathe. I found nothing on the ones that seem to be 2 1/4-6, can anyone tell me what these might fit?

The older 14 1/2" South Bend had/has a 2 1/4-6 spindle thread.
Ted
 
Thanks Ted, they appear to be for mounting a flat back chuck. I'll probably clean them up, take some pictures, and see if anyone needs them.
 








 
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