Sorry Randall thought I made it clear , I need the thread size of the small end where a draw bar attaches . There may be several types of this shank , but the ones I have seen on E-Bay have a threaded end on the small shank end .Hello and welcome to the site!
I'm not sure what you are asking for. Do you need the small diameter of the MT5 taper? Do you need the thread diameter for the ER nut? Do you need the size of the threaded drawbar hole that threads into the small end of the MT5 taper?
Please clarify so we can help you.
-Randall
Thanks Randall , I will have to wait till I get one in my hands to figure it out , Patience is a Virtue I guess , LOL .OK, John. Got it. Sorry for the misunderstanding. I'm not sure if there is a standard drawbar thread for the MT5 shank. If it was not mentioned in the ad or liturature for the chuck that you purchased, you'll likely need to measure it when you have it in-hand. I was hoping that you needed info that is actually standardized for the MT5 taper or for the ER40 end. Sorry I'm not more help at this point.
-Randall