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Bank on it...
1/2-20 is the thread.
I have checked it out in several ways:
1/2" chucks are only available in 1/2-20 thread
I have threaded a nut on it that is out of a box marked "1/2-20"
I have held up a bolt that I measured to be 20 threads per inch to the drill shaft and matched up the threads perfectly.
Finally, I measured the thread length of the drill shaft (~3/8") and counted the number of threads (~7.5) to get (60/3 = 20).
Believe me or do your own measurements & calculations but you can depend on it, the thread is a 1/2-20.
Joe J.
Last edited by Joe Johnson : 07-02-2003 at 13:42.
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