Join Date: Jul 2015
Location: Pennsylvania, USA
I won't argue whether or not the pocket screws are right for this application, but I'd contend that one could easily exceed that force.
Because the leg is a lever and the joint is a fulcrum, you need to consider overall rotational force or torque. Since Length x Force = Torque, if the legs are, say, 2 feet long, and a 150lbs person leans into the table with 1/2 their weight, it's actually 75lbs x 2ft = 150 ft-lbs of torque.
Again, not arguing that you shouldn't use pocket screws (I know I've beat the crap out of some pocket screw joints), but if you're going to use woodgears math, you gotta consider the whole picture.