Thread size of the oil pan drain plug? 1/2-20?

[wjaholic]

I am looking for a magnetic drain plug for my oil pan and want to get it before my next oil change.

I have a '73 440 with the 699 pan, is the thread on the drain plug 1/2-20 or something different. I am having a hard time remembering.

Thanks

 

[daredevil]

yep 1/2 x20 with a 7/8 head