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The trapezoid in the library doesn't follow any standard, you can tweak the shape by adjusting the offset-factors in lines 34-40 (last numbers (-0.4, 0, 0.1, 0.5, -0.5, -0.5, 0.5))
Measurements are in [mm], you'll have to look up the specs for 2"UNF.
Use "difference" to substract the thread from your model, the diameter of the substracted thread has to be bigger though.

difference() {
cylinder(d=80, h=15, $fn=6);
translate([0,0,-5]) s_thread(59.614+1,2.309,25);
translate([0,0,-5]) cylinder(d=54, h=25);
}