1. M2 TAP DP4.0 P.C.D [greek symbol phi 16]
This mean M2 tap, depth 4.0 and PCD is picth circle dia like in this picture
2. M2 TAP THRU P.C.D [greek symbol phi 16]
This means M2 thru all tap, PCD 16
Dowel holes are reamed type hole with required FIT created with drill first and then reamed using reamers whereas drill size are normal holes created with drills. The surface finish in dowel holes is very fine compared to normal drilled hole and so is the tolerance.
Should I use Drill sizes in this case?
Q3: How to make holes for M2 and M2.5 screws? I tried different standards but I cannot find M2 and M2.5.
Those should be available under ANSI Metric. Male sure you picked threaded hole on the hole type. Check attached files for more details.
Thanks Deepak. By TAP, you mean tapper. Am I right? I see M2x0.4. Is 0.4 the length of the screw/hole? What if I want longer or shorter one? Custom sizing does not seem to allow the user to specify the depth of the hole.
TAP refers to a threaded hole.
The 0.4 is thread pitch (how far along the hole the thread goes per rotation), not the hole depth.
To set thread depth, go to the box called "End Condition", then click on "Through All" and change to "Blind", this will then give you a box where you can enter hole and tap depths.
Thanks Ian for the info.