Drill Chuck Arbor Sizes

[ebgb68]

I picked up some extra drill chucks for the mill but they need arbors. I wanted to make sure I'm sizing them right before I order.
Its a smaller Albrecht 0-1/4" and the hole measures around 3/8" at the top. I'm thinking its a #1 jacobs taper ? Is there a way to measure and make sure or reference chart for chuck brands ?
Thanks Ed

 

[extropic]

Here is a link to a table of dimensions. http://littlemachineshop.com/reference/tapers.php

If you want to accurately measure the female taper, you can check the top height of two different sized balls dropped into taper and do the trig.

 

[ebgb68]

Thanks for the link.