Hello,

I have some questions about making holes for the screws.

I got some 3rd party 2D CAD drawings that I would like to reproduce in 3D in SolidWorks. In those dawings, they have:

1. M2 TAP DP4.0 P.C.D [greek symbol phi 16]

2. M2 TAP THRU P.C.D [greek symbol phi 16]

3. greek symbol phy 2.1 HOLE THRU

Q1: What is the difference between 1 and 2? I don't know what DP, P.C.D are.

Q2: In Hole Wizard in SolidWorks EDU 2013-14, under ANSI Metric and Dowel Holes, there is a list of phi values but I cannot find phi 16 and phi 2.1. When I chose Drill Sizes, I found them. What is the different between Dowel Holes and Drill sizes? Can't find the explainations in:

http://help.solidworks.com/2014/English/solidworks/sldworks/HIDD_DVE_HW_HOLE_SPEC.htm

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.

Thanks.